diff --git a/MODULE.bazel b/MODULE.bazel
index 250f125117..0dc84962bc 100644
--- a/MODULE.bazel
+++ b/MODULE.bazel
@@ -821,7 +821,7 @@ bazel_dep(name = "bazel_features", version = "1.54.1")
 
 # Pinned SimpleCov gems Ruby tests load under `bazel coverage`; consumers need them (#3954).
 ruby_coverage = use_extension("//ruby/coverage:repos.bzl", "ruby_coverage")
-use_repo(ruby_coverage, "dx_ruby_coverage_gems")
+use_repo(ruby_coverage, "dx_ruby_bench_gems", "dx_ruby_coverage_gems")
 
 ruby_tools = use_extension("//ruby/toolchain:repos.bzl", "ruby_tools")
 use_repo(ruby_tools, "dx_sorbet", "rules_ruby")
@@ -1026,7 +1026,11 @@ pub_tools.from_lock(
     lock = "//dart/tools/dart_apitool:pubspec.lock",
     on_version_conflict = "upgrade",
 )
-use_repo(pub_tools, "dart_apitool_deps")
+pub_tools.from_lock(
+    name = "dx_dart_bench_deps",
+    lock = "//dart/rules/bench:pubspec.lock",
+)
+use_repo(pub_tools, "dart_apitool_deps", "dx_dart_bench_deps")
 
 # floor: equals tested; patched, consumers are pinned by the dx include (#5006)
 bazel_dep(name = "rules_julia", version = "0.8.0")
@@ -1227,7 +1231,7 @@ lua_tools = use_extension("//lua/toolchain:repos.bzl", "lua")
 use_repo(lua_tools, "dx_luacov", "dx_luacov_reporter_lcov", "dx_luals")
 
 php = use_extension("//php/toolchain:repos.bzl", "php")
-use_repo(php, "dx_composer", "dx_phpcs", "dx_phpstan", "dx_phpstan_strict_rules", "dx_phpunit", "dx_unused_public", "dx_webmozart_assert")
+use_repo(php, "dx_composer", "dx_phpbench", "dx_phpcs", "dx_phpstan", "dx_phpstan_strict_rules", "dx_phpunit", "dx_unused_public", "dx_webmozart_assert")
 
 haskell = use_extension("//haskell/toolchain:extensions.bzl", "haskell")
 haskell.lock(
diff --git a/MODULE.bazel.lock b/MODULE.bazel.lock
index 97fb88267f..a956e80881 100644
--- a/MODULE.bazel.lock
+++ b/MODULE.bazel.lock
@@ -525,7 +525,7 @@
     "//dart:extensions.bzl%pub": {
       "general": {
         "bzlTransitiveDigest": "VNTf9kwkvE2nQ/+jY5ktqngyMqwf0ge9JSbNN0s5rsc=",
-        "usagesDigest": "FnGiRM9ZVlSoil3JRzpF3xRK8Q9uy5A5lDXhZT1M1oA=",
+        "usagesDigest": "YeokpRu115TyqUUIiQaK52ZoI8IdIiqyJ9iHjlLmwJ8=",
         "recordedInputs": [
           "REPO_MAPPING:,dx_rules_dart_pub +dart_tools+dx_rules_dart_pub",
           "REPO_MAPPING:+dart_tools+dx_rules_dart_pub,bsd_tar_toolchains_darwin_amd64 tar.bzl++toolchains+bsd_tar_toolchains_darwin_amd64",
@@ -538,6 +538,7 @@
           "REPO_MAPPING:rules_dx_dart+,rules_dx ",
           "FILE:@@//third_party/dart/pubspec.lock d5a738f744941bbb4f4c2787d00d18d741e1c465fbe950f181884843712971dc",
           "FILE:@@//dart/tools/dart_apitool/pubspec.lock bcde4406b9a37a9d8df7f185033a0a067bfde50c4b786c71f5d6a38e9d138480",
+          "FILE:@@//dart/rules/bench/pubspec.lock 1fdb12d41f188d31d09c31a0dd13ee0e902ddc52e6a61f36e5832642c5990e3b",
           "FILE:@@rules_dx_dart+//dart/tests/padded_archive.pubspec.lock 387ec4ad36dc402444f6d88dc07d91027c1b65bdfa642254599ad4e7e2d513db"
         ],
         "generatedRepoSpecs": {
@@ -556,6 +557,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -644,6 +646,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -732,6 +735,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -820,6 +824,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -908,6 +913,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -996,6 +1002,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -1084,6 +1091,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -1172,6 +1180,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -1260,6 +1269,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -1348,6 +1358,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -1436,6 +1447,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -1524,6 +1536,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -1612,6 +1625,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -1700,6 +1714,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -1788,6 +1803,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -1876,6 +1892,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -1964,6 +1981,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -2052,6 +2070,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -2140,6 +2159,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -2228,6 +2248,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -2316,6 +2337,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -2404,6 +2426,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -2492,6 +2515,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -2580,6 +2604,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -2668,6 +2693,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -2756,6 +2782,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -2844,6 +2871,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -2932,6 +2960,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -3020,6 +3049,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -3108,6 +3138,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -3196,6 +3227,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -3284,6 +3316,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -3372,6 +3405,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -3460,6 +3494,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -3548,6 +3583,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -3636,6 +3672,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -3724,6 +3761,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -3812,6 +3850,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -3900,6 +3939,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -3988,6 +4028,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -4076,6 +4117,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -4164,6 +4206,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -4252,6 +4295,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -4340,6 +4384,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -4428,6 +4473,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -4516,6 +4562,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -4604,6 +4651,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -4692,6 +4740,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -4780,6 +4829,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -4868,6 +4918,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -4956,6 +5007,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -5044,6 +5096,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -5132,6 +5185,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -5220,6 +5274,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -5308,6 +5363,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -5396,6 +5452,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -5484,6 +5541,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -5572,6 +5630,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -5660,6 +5719,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -5748,6 +5808,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -5836,6 +5897,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -5924,6 +5986,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -6012,6 +6075,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -6100,6 +6164,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -6188,6 +6253,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -6276,6 +6342,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -6364,6 +6431,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -6452,6 +6520,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -6540,6 +6609,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -6628,6 +6698,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -6716,6 +6787,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -6804,6 +6876,96 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
+                "boolean_selector",
+                "characters",
+                "checked_yaml",
+                "cli_config",
+                "collection",
+                "colorize",
+                "colorize_lumberdash",
+                "console",
+                "convert",
+                "coverage",
+                "crypto",
+                "dart_apitool",
+                "ffi",
+                "file",
+                "freezed_annotation",
+                "frontend_server_client",
+                "glob",
+                "http_multi_server",
+                "http_parser",
+                "io",
+                "json_annotation",
+                "lints",
+                "logging",
+                "lumberdash",
+                "matcher",
+                "meta",
+                "mime",
+                "nested",
+                "node_preamble",
+                "package_config",
+                "path",
+                "petitparser",
+                "plist_parser",
+                "pool",
+                "posix",
+                "pub_semver",
+                "pubspec_manager",
+                "pubspec_parse",
+                "shelf",
+                "shelf_packages_handler",
+                "shelf_static",
+                "shelf_web_socket",
+                "simple_sparse_list",
+                "source_map_stack_trace",
+                "source_maps",
+                "source_span",
+                "stack",
+                "stack_trace",
+                "stream_channel",
+                "string_scanner",
+                "strings",
+                "term_glyph",
+                "test",
+                "test_api",
+                "test_core",
+                "tuple",
+                "typed_data",
+                "unicode",
+                "vector_math",
+                "vm_service",
+                "watcher",
+                "web",
+                "web_socket",
+                "web_socket_channel",
+                "webkit_inspection_protocol",
+                "xml",
+                "yaml"
+              ],
+              "explicit_packages": [],
+              "code_assets": [],
+              "ignore_hook": false
+            }
+          },
+          "dart_pub__benchmark_harness": {
+            "repoRuleId": "@@+dart_tools+dx_rules_dart_pub//dart/pub:pub_lock_package.bzl%pub_lock_package",
+            "attributes": {
+              "package_name": "benchmark_harness",
+              "version": "2.4.0",
+              "sha256": "a2d3c4c83cac0126bf38e41eaf7bd9ed4f6635f1ee1a0cbc6f79fa9736c62cbd",
+              "base_url": "https://pub.dev",
+              "hub_name": "dart_pub",
+              "lock_packages": [
+                "_fe_analyzer_shared",
+                "analyzer",
+                "ansicolor",
+                "archive",
+                "args",
+                "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -6892,6 +7054,7 @@
                 "archive",
                 "args",
                 "async",
+                "benchmark_harness",
                 "boolean_selector",
                 "characters",
                 "checked_yaml",
@@ -7074,6 +7237,17 @@
               ]
             }
           },
+          "dx_dart_bench_deps": {
+            "repoRuleId": "@@+dart_tools+dx_rules_dart_pub//dart/pub:pub_lock_hub.bzl%pub_lock_hub",
+            "attributes": {
+              "hub_name": "dx_dart_bench_deps",
+              "spoke_prefix": "dart_pub",
+              "packages": [
+                "args",
+                "benchmark_harness"
+              ]
+            }
+          },
           "dx_dart_padded_archive": {
             "repoRuleId": "@@+dart_tools+dx_rules_dart_pub//dart/pub:pub_lock_hub.bzl%pub_lock_hub",
             "attributes": {
@@ -7087,7 +7261,8 @@
         },
         "moduleExtensionMetadata": {
           "explicitRootModuleDirectDeps": [
-            "dart_apitool_deps"
+            "dart_apitool_deps",
+            "dx_dart_bench_deps"
           ],
           "explicitRootModuleDirectDevDeps": [
             "dx_dart_deps"
diff --git a/dart/README.md b/dart/README.md
index 18c5786741..ee3a488320 100644
--- a/dart/README.md
+++ b/dart/README.md
@@ -40,6 +40,7 @@ dart_test(
 | `dart_library` | A package from `.dart` files, importable as `package:<name>` |
 | `dart_binary` | A compiled executable that runs with `bazel run` |
 | `dart_test` | Runs one test file with the package:test runner |
+| `dart_bench` | `dart_test` for `dx bench`. `main` calls `runBenchmarks` from `package:dx_bench` with `BenchmarkBase` objects; seconds per run. Depend on `@dx_dart_bench_deps//:benchmark_harness` for the base class |
 | `dart_codegen` | Runs a generator script over one `.dart` file and makes the output files |
 
 `dart_js_binary` and `dart_wasm_binary` compile a web app to `.js`, or to `.wasm` plus its `.mjs` loader and `.support.js`.
diff --git a/dart/rules/bench/BUILD.bazel b/dart/rules/bench/BUILD.bazel
new file mode 100644
index 0000000000..209d3a8b3c
--- /dev/null
+++ b/dart/rules/bench/BUILD.bazel
@@ -0,0 +1,24 @@
+load("//dart/rules:defs.bzl", "dart_library")
+load("//quality:fixtures.bzl", "real_source_target")
+
+# gazelle:dx_external pub dart/rules/bench/pubspec.lock dx_dart_bench_deps
+
+package(default_visibility = ["//visibility:public"])
+
+exports_files([
+    "pubspec.lock",
+    "pubspec.yaml",
+])
+
+dart_library(
+    name = "bench",
+    srcs = ["lib/dx_bench.dart"],
+    package_name = "dx_bench",
+    deps = ["@dx_dart_bench_deps//:benchmark_harness"],
+)
+
+real_source_target(
+    name = "corpus_starlark",
+    starlark_srcs = ["BUILD.bazel"],
+    tags = ["corpus"],
+)
diff --git a/dart/rules/bench/lib/dx_bench.dart b/dart/rules/bench/lib/dx_bench.dart
new file mode 100644
index 0000000000..db2032a4e3
--- /dev/null
+++ b/dart/rules/bench/lib/dx_bench.dart
@@ -0,0 +1,24 @@
+import 'dart:convert';
+import 'dart:io';
+
+import 'package:benchmark_harness/benchmark_harness.dart';
+
+/// Measures each benchmark and writes dx-bench.json, in seconds per run.
+void runBenchmarks(List<BenchmarkBase> benchmarks) {
+  final results = <Map<String, Object>>[];
+  for (final benchmark in benchmarks) {
+    final micros = benchmark.measure();
+    results.add({
+      'name': benchmark.name,
+      'unit': 's',
+      'mean': micros / 1e6,
+      'stddev': 0.0,
+      'iterations': 1,
+    });
+  }
+  final dir = Platform.environment['TEST_UNDECLARED_OUTPUTS_DIR'];
+  if (dir == null) {
+    throw StateError('TEST_UNDECLARED_OUTPUTS_DIR is not set');
+  }
+  File('$dir/dx-bench.json').writeAsStringSync(jsonEncode({'schema': 'dx-bench/v1', 'results': results}));
+}
diff --git a/dart/rules/bench/pubspec.lock b/dart/rules/bench/pubspec.lock
new file mode 100644
index 0000000000..c52820a933
--- /dev/null
+++ b/dart/rules/bench/pubspec.lock
@@ -0,0 +1,21 @@
+# Generated by pub
+# See https://dart.dev/tools/pub/glossary#lockfile
+packages:
+  args:
+    dependency: transitive
+    description:
+      name: args
+      sha256: d0481093c50b1da8910eb0bb301626d4d8eb7284aa739614d2b394ee09e3ea04
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.7.0"
+  benchmark_harness:
+    dependency: "direct main"
+    description:
+      name: benchmark_harness
+      sha256: a2d3c4c83cac0126bf38e41eaf7bd9ed4f6635f1ee1a0cbc6f79fa9736c62cbd
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.4.0"
+sdks:
+  dart: ">=3.10.0 <4.0.0"
diff --git a/dart/rules/bench/pubspec.yaml b/dart/rules/bench/pubspec.yaml
new file mode 100644
index 0000000000..fb8ecb5647
--- /dev/null
+++ b/dart/rules/bench/pubspec.yaml
@@ -0,0 +1,6 @@
+name: dx_dart_bench
+publish_to: none
+environment:
+  sdk: ^3.10.0
+dependencies:
+  benchmark_harness: 2.4.0
diff --git a/dart/rules/defs.bzl b/dart/rules/defs.bzl
index b520a5db17..2ad2ce91bf 100644
--- a/dart/rules/defs.bzl
+++ b/dart/rules/defs.bzl
@@ -4,6 +4,7 @@ load("@rules_dart//dart:defs.bzl", _dart_binary = "dart_binary", _dart_codegen =
 load("@rules_dart//dart:providers.bzl", "DartAnalyzableInfo", "DartCompileInfo", "DartInfo")
 load("//libs/starlark:cells.bzl", "unsupported_constraint")
 load("//libs/starlark:entry.bzl", "dx_entry_quality_srcs", "dx_infer_main", "dx_main_candidates")
+load("//libs/starlark:fuzz_bench.bzl", "merge_tags")
 load("//libs/starlark:wrapper.bzl", "DX_EXEC_PROVIDES", "dx_executable_forward_rule", "dx_language_kwargs", "dx_lcov_merger_attr", "dx_library_forward_rule", "dx_wrap", "dx_wrap_binary", "dx_wrap_test")
 load("//quality:sources.bzl", "QualitySourcesInfo", "QualityToolsInfo")
 
@@ -108,3 +109,14 @@ def dart_test(name, *, main = None, srcs = None, visibility = None, **kwargs):
     main = dx_infer_main("dart_test", name, main, srcs, dx_main_candidates(name, ".dart", ["test"]))
     kwargs = dx_language_kwargs(kwargs, DART_DEFERRED_SKIP_TAGS, DART_COMPATIBLE_WITH)
     dx_wrap_test(name, _dart_test, _dart_forward_test, srcs, visibility = visibility, upstream_kwargs = dict(kwargs, main = main), quality_srcs = dx_entry_quality_srcs(main, srcs), **kwargs)
+
+def dart_bench(name, main = None, srcs = None, deps = None, tags = None, **kwargs):
+    """A dart_test run by dx bench: `main` calls runBenchmarks from package:dx_bench with BenchmarkBase objects, which writes dx-bench.json."""
+    dart_test(
+        name = name,
+        main = main,
+        srcs = srcs,
+        deps = (deps or []) + [Label("//dart/rules/bench")],
+        tags = merge_tags(tags, "dx-bench", "manual"),
+        **kwargs
+    )
diff --git a/dart/tests/bench/BUILD.bazel b/dart/tests/bench/BUILD.bazel
new file mode 100644
index 0000000000..7d8d6c482a
--- /dev/null
+++ b/dart/tests/bench/BUILD.bazel
@@ -0,0 +1,19 @@
+load("//dart/rules:defs.bzl", "dart_bench")
+load("//quality:fixtures.bzl", "real_source_target")
+
+package(
+    default_testonly = True,
+    default_visibility = ["//:__subpackages__"],
+)
+
+dart_bench(
+    name = "sum_bench",
+    main = "sum_bench.dart",
+    deps = ["@dx_dart_bench_deps//:benchmark_harness"],
+)
+
+real_source_target(
+    name = "corpus_starlark",
+    starlark_srcs = ["BUILD.bazel"],
+    tags = ["corpus"],
+)
diff --git a/dart/tests/bench/sum_bench.dart b/dart/tests/bench/sum_bench.dart
new file mode 100644
index 0000000000..8c7d8629bc
--- /dev/null
+++ b/dart/tests/bench/sum_bench.dart
@@ -0,0 +1,19 @@
+import 'package:benchmark_harness/benchmark_harness.dart';
+import 'package:dx_bench/dx_bench.dart';
+
+class SumBench extends BenchmarkBase {
+  SumBench() : super('sum');
+
+  var total = 0;
+
+  @override
+  void run() {
+    for (var i = 0; i < 1000; i++) {
+      total += i;
+    }
+  }
+}
+
+void main() {
+  runBenchmarks([SumBench()]);
+}
diff --git a/docs/cli/commands/README.md b/docs/cli/commands/README.md
index d8e65728a3..e85073a667 100644
--- a/docs/cli/commands/README.md
+++ b/docs/cli/commands/README.md
@@ -327,6 +327,7 @@ dx rule that wraps it.
 |  |  | `@rules_dx//d/rules:defs.bzl` | `d_bench` |
 |  |  | `@rules_dx//d/rules:defs.bzl` | `d_fuzz_test` |
 |  |  | `@rules_dx//d/rules:defs.bzl` | `d_quality_srcs` |
+|  |  | `@rules_dx//dart/rules:defs.bzl` | `dart_bench` |
 |  |  | `@rules_dx//dart/rules:defs.bzl` | `dart_binary` |
 |  |  | `@rules_dx//dart/rules:defs.bzl` | `dart_js_binary` |
 |  |  | `@rules_dx//dart/rules:defs.bzl` | `dart_library` |
@@ -482,6 +483,8 @@ dx rule that wraps it.
 |  |  | `@rules_dx//ocaml/rules:defs.bzl` | `toolchain_choice` |
 |  |  | `@rules_dx//ocaml/rules:defs.bzl` | `toolchain_settings` |
 |  |  | `@rules_dx//ocaml/tests/native:defs.bzl` | `sys_cell_test` |
+|  |  | `@rules_dx//perl/rules:defs.bzl` | `perl_bench` |
+|  |  | `@rules_dx//php/rules:defs.bzl` | `php_bench` |
 |  |  | `@rules_dx//php/rules:defs.bzl` | `php_binary` |
 |  |  | `@rules_dx//php/rules:defs.bzl` | `php_library` |
 |  |  | `@rules_dx//php/rules:defs.bzl` | `php_test` |
@@ -516,6 +519,7 @@ dx rule that wraps it.
 |  |  | `@rules_dx//rego/rules:defs.bzl` | `rego_library` |
 |  |  | `@rules_dx//rego/rules:defs.bzl` | `rego_test` |
 |  |  | `@rules_dx//rst/rules:defs.bzl` | `rst_library` |
+|  |  | `@rules_dx//ruby/rules:defs.bzl` | `ruby_bench` |
 |  |  | `@rules_dx//ruby/rules:defs.bzl` | `ruby_coverage_lib_dirs` |
 |  |  | `@rules_dx//rust/rules:defs.bzl` | `rust_bench` |
 |  |  | `@rules_dx//rust/rules:defs.bzl` | `rust_binary` |
diff --git a/docs/cli/commands/bench.md b/docs/cli/commands/bench.md
index b569e3b4a8..7d2b546069 100644
--- a/docs/cli/commands/bench.md
+++ b/docs/cli/commands/bench.md
@@ -24,7 +24,7 @@ sh_test(
 
 `dx bench` selects the `dx-bench` tests inside the scope with `attr(tags, ...)` over `tests(<scope>)`, then runs them with `--runs_per_test=1 --nocache_test_results --local_test_jobs=1 --test_output=errors --test_env=DX_BENCH=1`. Bazel flags after `--` are forwarded, except the ones dx owns.
 
-Every `<lang>_bench` macro (`go_bench`, `rust_bench`, `java_bench`, `kotlin_bench`, `python_bench`, `csharp_bench`, `fsharp_bench`, `d_bench`, `javascript_bench`, `typescript_bench`, `cc_bench`, `zig_bench`) declares `<name>` as the manual `dx-bench` test dx runs. Test attributes such as `size` (default `small`), `timeout`, `env`, `args`, `data`, `flaky` and `shard_count` go to `<name>`, the other attributes go to the private `<name>_bin`, and `tags` are merged with `dx-bench` and `manual`.
+Every `<lang>_bench` macro (`go_bench`, `rust_bench`, `java_bench`, `kotlin_bench`, `python_bench`, `csharp_bench`, `fsharp_bench`, `d_bench`, `javascript_bench`, `typescript_bench`, `cc_bench`, `zig_bench`, `perl_bench`, `ruby_bench`, `dart_bench`, `php_bench`) declares `<name>` as the manual `dx-bench` test dx runs. Test attributes such as `size` (default `small`), `timeout`, `env`, `args`, `data`, `flaky` and `shard_count` go to `<name>`, the other attributes go to the private `<name>_bin`, and `tags` are merged with `dx-bench` and `manual`.
 
 Go: `go_bench(name, srcs, embed = ...)` from `//go/rules:defs.bzl` runs the `Benchmark*` functions with `-test.bench=. -test.benchmem` and turns each `ns/op`, `B/op` and `allocs/op` column into one result named `<Benchmark> <unit>`. The Go gazelle extension adds `<name>_bench` next to the `go_test` when a test file declares a `Benchmark*` function.
 
@@ -49,3 +49,11 @@ D: `d_bench(name, srcs)` from `//d/rules:defs.bzl` is a `d_binary` that writes `
 Rust: `rust_bench` from `//rust/rules:defs.bzl` runs a criterion or `#[bench]` target with `--output-format bencher` and writes `dx-bench.json` in ns/iter. Gazelle turns `[[bench]]` entries with `harness = false` into `rust_bench` targets.
 
 JavaScript and TypeScript: `javascript_bench(name, srcs, node_modules)` from `//javascript/rules:defs.bzl` and `typescript_bench` from `//typescript/rules:defs.bzl` run a [tinybench](https://github.com/tinylibs/tinybench) `Bench` that the first source (or `main`) exports as its default export. Each task becomes one row, in milliseconds. List `tinybench` in `package.json` so `node_modules` links it. `typescript_bench` also takes the `typescript_test` attributes such as `deps` and `tsconfig`.
+
+Perl: `perl_bench` from `//perl/rules:defs.bzl` is a `perl_test` whose script calls `DxBench::run_benchmarks([name => sub { ... }, ...])`. It times each sub with the core `Benchmark` module and reports seconds per call.
+
+Ruby: `ruby_bench` from `//ruby/rules:defs.bzl` takes `main`, a script that calls `DxBench.run { |x| x.report("name") { ... } }` with the benchmark-ips API. The pinned benchmark-ips gem comes with rules_dx, so no Gemfile entry is needed. Results are in seconds per call.
+
+Dart: `dart_bench` from `//dart/rules:defs.bzl` takes `main`, a program that calls `runBenchmarks([...])` from `package:dx_bench` with benchmark_harness `BenchmarkBase` objects. The pinned benchmark_harness comes from the `@dx_dart_bench_deps` hub of rules_dx. Results are in seconds per run.
+
+PHP: `php_bench` from `//php/rules:defs.bzl` takes `benches`, phpbench files with one class per file named like the file, with `#[Revs]` and `#[Iterations]` attributes. The pinned phpbench phar comes with rules_dx and runs on the pinned PHP. Results are in seconds per revolution.
diff --git a/families/perl/perl/tests/bench/BUILD.bazel b/families/perl/perl/tests/bench/BUILD.bazel
new file mode 100644
index 0000000000..6bb5e11ec9
--- /dev/null
+++ b/families/perl/perl/tests/bench/BUILD.bazel
@@ -0,0 +1,24 @@
+load("@rules_dx//perl/rules:defs.bzl", "perl_bench", "perl_test")
+load("@rules_dx//quality:fixtures.bzl", "real_source_target")
+
+package(
+    default_testonly = True,
+    default_visibility = ["//visibility:public"],
+)
+
+perl_bench(
+    name = "sum_bench",
+    srcs = ["sum_bench.pl"],
+)
+
+perl_test(
+    name = "bench_report_test",
+    srcs = ["check_test.pl"],
+    deps = ["@rules_dx//perl/rules:bench"],
+)
+
+real_source_target(
+    name = "corpus_starlark",
+    starlark_srcs = ["BUILD.bazel"],
+    tags = ["corpus"],
+)
diff --git a/families/perl/perl/tests/bench/check_test.pl b/families/perl/perl/tests/bench/check_test.pl
new file mode 100644
index 0000000000..7cf5da1757
--- /dev/null
+++ b/families/perl/perl/tests/bench/check_test.pl
@@ -0,0 +1,14 @@
+use strict;
+use warnings;
+use JSON::PP qw(decode_json);
+use Test::More tests => 3;
+
+my $dir = $ENV{TEST_TMPDIR} // '.';
+$ENV{TEST_UNDECLARED_OUTPUTS_DIR} = $dir;
+use DxBench qw(run_benchmarks);
+
+is( run_benchmarks( [ noop => sub { 1 } ], iterations => 2, rounds => 2 ), 1, 'one case' );
+open my $fh, '<', "$dir/dx-bench.json" or die $!;
+my $doc = decode_json( do { local $/; <$fh> } );
+is( $doc->{schema}, 'dx-bench/v1', 'schema' );
+is( $doc->{results}[0]{name}, 'noop', 'name' );
diff --git a/families/perl/perl/tests/bench/sum_bench.pl b/families/perl/perl/tests/bench/sum_bench.pl
new file mode 100644
index 0000000000..5e27549705
--- /dev/null
+++ b/families/perl/perl/tests/bench/sum_bench.pl
@@ -0,0 +1,18 @@
+use strict;
+use warnings;
+use DxBench qw(run_benchmarks);
+
+my @numbers = ( 1 .. 1000 );
+
+run_benchmarks(
+    [
+        sum_loop => sub {
+            my $total = 0;
+            $total += $_ for @numbers;
+            return $total;
+        },
+        sum_join => sub { return eval join '+', @numbers },
+    ],
+    iterations => 20,
+    rounds     => 3,
+);
diff --git a/families/php/php/tests/bench/BUILD.bazel b/families/php/php/tests/bench/BUILD.bazel
new file mode 100644
index 0000000000..5d3ef0ec5c
--- /dev/null
+++ b/families/php/php/tests/bench/BUILD.bazel
@@ -0,0 +1,18 @@
+load("@rules_dx//php/rules:defs.bzl", "php_bench")
+load("@rules_dx//quality:fixtures.bzl", "real_source_target")
+
+package(
+    default_testonly = True,
+    default_visibility = ["//visibility:public"],
+)
+
+php_bench(
+    name = "sum_bench",
+    benches = ["SumBench.php"],
+)
+
+real_source_target(
+    name = "corpus_starlark",
+    starlark_srcs = ["BUILD.bazel"],
+    tags = ["corpus"],
+)
diff --git a/families/php/php/tests/bench/SumBench.php b/families/php/php/tests/bench/SumBench.php
new file mode 100644
index 0000000000..1123d070ae
--- /dev/null
+++ b/families/php/php/tests/bench/SumBench.php
@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+use PhpBench\Attributes\Iterations;
+use PhpBench\Attributes\Revs;
+
+final class SumBench
+{
+    #[Revs(50), Iterations(3)]
+    public function benchSumLoop(): int
+    {
+        $total = 0;
+        for ($i = 1; $i <= 1000; $i++) {
+            $total += $i;
+        }
+
+        return $total;
+    }
+
+    #[Revs(50), Iterations(3)]
+    public function benchArraySum(): int
+    {
+        return array_sum(range(1, 1000));
+    }
+}
diff --git a/families/ruby/ruby/tests/fixtures/bench/BUILD.bazel b/families/ruby/ruby/tests/fixtures/bench/BUILD.bazel
new file mode 100644
index 0000000000..4e89b36c93
--- /dev/null
+++ b/families/ruby/ruby/tests/fixtures/bench/BUILD.bazel
@@ -0,0 +1,19 @@
+load("@rules_dx//quality:fixtures.bzl", "real_source_target")
+load("@rules_dx//ruby/rules:defs.bzl", "ruby_bench")
+
+package(
+    default_testonly = True,
+    default_visibility = ["//visibility:public"],
+)
+
+ruby_bench(
+    name = "sum_bench",
+    main = "sum_bench.rb",
+)
+
+real_source_target(
+    name = "corpus_starlark",
+    testonly = True,
+    starlark_srcs = ["BUILD.bazel"],
+    tags = ["corpus"],
+)
diff --git a/families/ruby/ruby/tests/fixtures/bench/sum_bench.rb b/families/ruby/ruby/tests/fixtures/bench/sum_bench.rb
new file mode 100644
index 0000000000..fa6cb1bab5
--- /dev/null
+++ b/families/ruby/ruby/tests/fixtures/bench/sum_bench.rb
@@ -0,0 +1,6 @@
+numbers = (1..1000).to_a
+
+DxBench.run(time: 0.2, warmup: 0.1) do |x|
+  x.report("sum") { numbers.sum }
+  x.report("inject") { numbers.inject(:+) }
+end
diff --git a/perl/README.md b/perl/README.md
index 57a628883f..31aea66e6c 100644
--- a/perl/README.md
+++ b/perl/README.md
@@ -41,6 +41,7 @@ perl_binary(
 | --- | --- |
 | `perl_library` | Modules from `.pm` files, with `lib` and the package on `@INC` |
 | `perl_test` | Runs one `.t` script; a non-zero exit fails the test |
+| `perl_bench` | `perl_test` for `dx bench`. The script calls `DxBench::run_benchmarks` with `name => sub` pairs, timed with core `Benchmark`; seconds per call |
 | `perl_binary` | Runs one `.pl` script with `bazel run` |
 
 - Library `tags` reach the library; the generated upstream target is
diff --git a/perl/rules/BUILD.bazel b/perl/rules/BUILD.bazel
index e1121b1439..ff60100bd0 100644
--- a/perl/rules/BUILD.bazel
+++ b/perl/rules/BUILD.bazel
@@ -5,7 +5,7 @@ load("//libs/starlark:defs.bzl", "expect_equal")
 load("//libs/starlark:entry.bzl", "dx_entry_quality_srcs")
 load("//libs/starlark:wrapper.bzl", "dx_language_kwargs")
 load("//quality:fixtures.bzl", "real_source_target")
-load(":defs.bzl", "PERL_DEFERRED_SKIP_TAGS", "PERL_QUALITY_TOOLS", "PERL_SOURCE_EXTS", "PERL_SOURCE_SPECS")
+load(":defs.bzl", "PERL_DEFERRED_SKIP_TAGS", "PERL_QUALITY_TOOLS", "PERL_SOURCE_EXTS", "PERL_SOURCE_SPECS", "perl_library")
 load(":platforms.bzl", "PERL_PLATFORMS")
 
 package(default_visibility = ["//visibility:public"])
@@ -18,6 +18,13 @@ exports_files([
     "wrapper_tests.bzl",
 ])
 
+perl_library(
+    name = "bench",
+    srcs = ["lib/DxBench.pm"],
+    tags = ["manual"],
+    visibility = ["//visibility:public"],
+)
+
 dx_wrapper_contract_tests(
     name = "wrapper_contract_tests",
     extra_checks = [
diff --git a/perl/rules/defs.bzl b/perl/rules/defs.bzl
index ae761509e6..dad1c2c67f 100644
--- a/perl/rules/defs.bzl
+++ b/perl/rules/defs.bzl
@@ -3,6 +3,7 @@
 load("@rules_perl//perl:defs.bzl", _PerlInfo = "PerlInfo", _perl_binary = "perl_binary", _perl_library = "perl_library", _perl_test = "perl_test")
 load("//libs/starlark:cells.bzl", "unsupported_constraint")
 load("//libs/starlark:entry.bzl", "dx_entry_quality_srcs", "dx_infer_main", "dx_main_candidates")
+load("//libs/starlark:fuzz_bench.bzl", "merge_tags")
 load("//libs/starlark:wrapper.bzl", "DX_EXEC_PROVIDES", "dx_executable_forward_rule", "dx_language_kwargs", "dx_lcov_merger_attr", "dx_library_forward_rule", "dx_wrap", "dx_wrap_binary", "dx_wrap_test")
 load("//quality:sources.bzl", "QualitySourcesInfo", "QualityToolsInfo")
 
@@ -111,3 +112,14 @@ def perl_test(name, *, srcs = None, main = None, visibility = None, **kwargs):
     kwargs = dx_language_kwargs(kwargs, PERL_DEFERRED_SKIP_TAGS, PERL_COMPATIBLE_WITH)
     upstream = dict(kwargs, main = main)
     dx_wrap_test(name, _perl_test, _perl_forward_test, srcs, visibility = visibility, upstream_kwargs = upstream, extra_forward_kwargs = {"deps": kwargs.get("deps", [])}, quality_srcs = dx_entry_quality_srcs(main, srcs), **kwargs)
+
+def perl_bench(name, srcs = None, main = None, deps = None, tags = None, **kwargs):
+    """A perl_test run by dx bench: scripts call DxBench::run_benchmarks, which times them with core Benchmark and writes dx-bench.json."""
+    perl_test(
+        name = name,
+        srcs = srcs,
+        main = main,
+        deps = (deps or []) + [Label("//perl/rules:bench")],
+        tags = merge_tags(tags, "dx-bench", "manual"),
+        **kwargs
+    )
diff --git a/perl/rules/lib/DxBench.pm b/perl/rules/lib/DxBench.pm
new file mode 100644
index 0000000000..bfd07c5db5
--- /dev/null
+++ b/perl/rules/lib/DxBench.pm
@@ -0,0 +1,57 @@
+package DxBench;
+
+use strict;
+use warnings;
+use Benchmark qw(timeit);
+use Exporter qw(import);
+use Time::HiRes qw(time);
+use JSON::PP ();
+
+our @EXPORT_OK = qw(run_benchmarks);
+
+my $DEFAULT_ITERATIONS = 100;
+my $DEFAULT_ROUNDS     = 5;
+
+sub _measure {
+    my ( $code, $iterations, $rounds ) = @_;
+    my @times;
+    for ( 1 .. $rounds ) {
+        my $start = time;
+        timeit( $iterations, $code );
+        push @times, ( time - $start ) / $iterations;
+    }
+    my $mean = 0;
+    $mean += $_ for @times;
+    $mean /= @times;
+    my $var = 0;
+    $var += ( $_ - $mean )**2 for @times;
+    my $stddev = @times > 1 ? sqrt( $var / ( @times - 1 ) ) : 0;
+    return ( $mean, $stddev );
+}
+
+sub run_benchmarks {
+    my ( $cases, %opts ) = @_;
+    my $iterations = $opts{iterations} // $DEFAULT_ITERATIONS;
+    my $rounds     = $opts{rounds}     // $DEFAULT_ROUNDS;
+    my @results;
+    while ( my ( $name, $code ) = splice @{$cases}, 0, 2 ) {
+        my ( $mean, $stddev ) = _measure( $code, $iterations, $rounds );
+        push @results,
+          {
+            name       => $name,
+            unit       => 's',
+            mean       => $mean + 0,
+            stddev     => $stddev + 0,
+            iterations => $iterations * $rounds,
+          };
+    }
+    my $dir = $ENV{TEST_UNDECLARED_OUTPUTS_DIR};
+    die "TEST_UNDECLARED_OUTPUTS_DIR is not set\n" unless defined $dir;
+    open my $fh, '>', "$dir/dx-bench.json" or die "dx-bench.json: $!\n";
+    print {$fh} JSON::PP->new->canonical->encode(
+        { schema => 'dx-bench/v1', results => \@results } );
+    close $fh or die "dx-bench.json: $!\n";
+    return scalar @results;
+}
+
+1;
diff --git a/php/README.md b/php/README.md
index 922e53b068..15cec5054d 100644
--- a/php/README.md
+++ b/php/README.md
@@ -43,6 +43,7 @@ php_binary(
 | `php_library` | Sources whose classes other targets load; every file is checked with `php -l` at build time |
 | `php_binary` | Runs `main` with `bazel run` |
 | `php_test` | Runs PHPUnit test files; a failure or an empty suite fails the test |
+| `php_bench` | `php_test` for `dx bench`. `benches` lists phpbench files, one class per file named like the file; the pinned phpbench phar runs them. `php_fuzz_test` is not offered: php-fuzzer is not a pinned phar |
 
 - A syntax error fails the build, not the first run.
 - PHP runs with `-n`, so no `php.ini` from the host is read. Set ini values
diff --git a/php/rules/BUILD.bazel b/php/rules/BUILD.bazel
index afdd407612..cd7c584052 100644
--- a/php/rules/BUILD.bazel
+++ b/php/rules/BUILD.bazel
@@ -8,6 +8,7 @@ load(":php.bzl", "PHP_SOURCE_EXTS", "autoloader_suffix", "coverage_launcher_scri
 package(default_visibility = ["//visibility:public"])
 
 exports_files([
+    "BenchTest.php",
     "defs.bzl",
     "php.bzl",
     "providers.bzl",
diff --git a/php/rules/BenchTest.php b/php/rules/BenchTest.php
new file mode 100644
index 0000000000..934fd2492c
--- /dev/null
+++ b/php/rules/BenchTest.php
@@ -0,0 +1,60 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Dx\Bench;
+
+use PHPUnit\Framework\TestCase;
+
+final class BenchTest extends TestCase
+{
+    public function testRunsPhpBench(): void
+    {
+        $srcdir = (string) getenv('TEST_SRCDIR');
+        $phar = $srcdir . '/' . (string) getenv('DX_PHPBENCH');
+        $files = [];
+        foreach (explode(' ', (string) getenv('DX_BENCH_FILES')) as $file) {
+            $files[] = $srcdir . '/' . $file;
+        }
+        $out = (string) getenv('TEST_UNDECLARED_OUTPUTS_DIR');
+        $dump = $out . '/phpbench.xml';
+
+        $command = array_merge(
+            [PHP_BINARY, $phar, 'run'],
+            $files,
+            ['--progress=none', '--dump-file=' . $dump],
+        );
+        exec(implode(' ', array_map('escapeshellarg', $command)) . ' 2>&1', $lines, $status);
+        self::assertSame(0, $status, implode("\n", $lines));
+
+        $suite = simplexml_load_file($dump);
+        self::assertNotFalse($suite);
+        $results = [];
+        foreach ($suite->xpath('//subject') ?: [] as $subject) {
+            foreach ($subject->variant as $variant) {
+                $revs = (int) $variant['revs'];
+                $times = [];
+                foreach ($variant->iteration as $iteration) {
+                    $times[] = (float) $iteration['time-net'] / $revs / 1e6;
+                }
+                if ($times === []) {
+                    continue;
+                }
+                $mean = array_sum($times) / count($times);
+                $variance = 0.0;
+                foreach ($times as $time) {
+                    $variance += ($time - $mean) ** 2;
+                }
+                $results[] = [
+                    'name' => (string) $subject['name'],
+                    'unit' => 's',
+                    'mean' => $mean,
+                    'stddev' => sqrt($variance / count($times)),
+                    'iterations' => count($times) * $revs,
+                ];
+            }
+        }
+        self::assertNotSame([], $results, 'phpbench reported no results');
+        file_put_contents($out . '/dx-bench.json', json_encode(['schema' => 'dx-bench/v1', 'results' => $results]));
+    }
+}
diff --git a/php/rules/defs.bzl b/php/rules/defs.bzl
index cf5a5be50a..051edd3e0c 100644
--- a/php/rules/defs.bzl
+++ b/php/rules/defs.bzl
@@ -2,6 +2,7 @@
 
 load("//libs/starlark:cells.bzl", "cells_compatible_with")
 load("//libs/starlark:entry.bzl", "dx_entry_quality_srcs", "dx_infer_main", "dx_main_candidates")
+load("//libs/starlark:fuzz_bench.bzl", "merge_tags")
 load("//libs/starlark:wrapper.bzl", "DX_EXEC_PROVIDES", "dx_executable_forward_rule", "dx_language_kwargs", "dx_lcov_merger_attr", "dx_library_forward_rule", "dx_wrap", "dx_wrap_binary", "dx_wrap_test")
 load("//php/toolchain:pins.bzl", "PHP_CELLS")
 load("//quality:sources.bzl", "QualitySourcesInfo")
@@ -66,3 +67,19 @@ def php_test(name, *, srcs = None, visibility = None, **kwargs):
     """Runs PHPUnit test files on the pinned PHP and PHPUnit. srcs are the test files and are linted."""
     kwargs = dx_language_kwargs(kwargs, PHP_DEFERRED_SKIP_TAGS, PHP_COMPATIBLE_WITH)
     dx_wrap_test(name, _php_test, _php_forward_test, srcs, visibility = visibility, quality_srcs = dx_entry_quality_srcs(None, srcs), **kwargs)
+
+def php_bench(name, benches, data = None, env = None, tags = None, **kwargs):
+    """A php_test run by dx bench: phpbench runs the `benches` files, one class per file named like the file, and the result is written as dx-bench.json."""
+    phar = Label("@dx_phpbench//:phpbench.phar")
+    php_test(
+        name = name,
+        srcs = [Label("//php/rules:BenchTest.php")],
+        data = (data or []) + benches + [phar],
+        env = dict(
+            env or {},
+            DX_BENCH_FILES = " ".join(["$(rlocationpath %s)" % bench for bench in benches]),
+            DX_PHPBENCH = "$(rlocationpath %s)" % phar,
+        ),
+        tags = merge_tags(tags, "dx-bench", "manual"),
+        **kwargs
+    )
diff --git a/php/toolchain/metadata_tests.bzl b/php/toolchain/metadata_tests.bzl
index 9952825196..fb6d1b81be 100644
--- a/php/toolchain/metadata_tests.bzl
+++ b/php/toolchain/metadata_tests.bzl
@@ -6,10 +6,10 @@ load("//libs/starlark:defs.bzl", "expect_contains", "expect_equal", "expect_true
 load("//php/rules:defs.bzl", "PHP_COMPATIBLE_WITH")
 load("//php/rules:php.bzl", "lit", "rf", "runfiles_path", "write_launcher")
 load(":php.bzl", "TOOLCHAIN_TYPE")
-load(":pins.bzl", "COMPOSER", "PCOV", "PHPCS", "PHPSTAN", "PHPSTAN_STRICT_RULES", "PHPUNIT", "PHP_CELLS", "PHP_HEADERS", "PHP_VERSION", "STATIC_PHP", "UNUSED_PUBLIC", "WEBMOZART_ASSERT")
+load(":pins.bzl", "COMPOSER", "PCOV", "PHPBENCH", "PHPCS", "PHPSTAN", "PHPSTAN_STRICT_RULES", "PHPUNIT", "PHP_CELLS", "PHP_HEADERS", "PHP_VERSION", "STATIC_PHP", "UNUSED_PUBLIC", "WEBMOZART_ASSERT")
 load(":repos.bzl", "VERSION_FILE", "hub_build", "runtime_build")
 
-PINS = [COMPOSER, PCOV, PHPCS, PHPSTAN, PHPSTAN_STRICT_RULES, PHPUNIT, UNUSED_PUBLIC, WEBMOZART_ASSERT]
+PINS = [COMPOSER, PCOV, PHPBENCH, PHPCS, PHPSTAN, PHPSTAN_STRICT_RULES, PHPUNIT, UNUSED_PUBLIC, WEBMOZART_ASSERT]
 
 def _checks():
     hub = hub_build(PHP_CELLS.keys())
diff --git a/php/toolchain/pins.bzl b/php/toolchain/pins.bzl
index c1c5394b1c..9806edc4cc 100644
--- a/php/toolchain/pins.bzl
+++ b/php/toolchain/pins.bzl
@@ -96,3 +96,9 @@ PHPSTAN = struct(
     sha256 = "aa5cc7543f0de0ae7997deb24f654a3b2454b6ba4ba2c4552957a175886b60b1",
     urls = ["https://github.com/phpstan/phpstan/releases/download/2.3.3/phpstan.phar"],
 )
+
+PHPBENCH = struct(
+    version = "1.7.0",
+    sha256 = "68563bfbef7eb3af8ebf6b62ce80c9646ab61c9b1ce0011b57fb947f73ac3b37",
+    urls = ["https://github.com/phpbench/phpbench/releases/download/1.7.0/phpbench.phar"],
+)
diff --git a/php/toolchain/repos.bzl b/php/toolchain/repos.bzl
index 0a61e47bb6..b43fc3ee1c 100644
--- a/php/toolchain/repos.bzl
+++ b/php/toolchain/repos.bzl
@@ -1,7 +1,7 @@
 """Hermetic PHP, Composer and PHPUnit acquisition and toolchain registration."""
 
 load("//libs/starlark:repo.bzl", "hub_repo", "pinned_archive")
-load(":pins.bzl", "COMPOSER", "PCOV", "PCRE2_HEADERS", "PHPCS", "PHPSTAN", "PHPSTAN_STRICT_RULES", "PHPUNIT", "PHP_CELLS", "PHP_HEADERS", "PHP_VERSION", "UNUSED_PUBLIC", "WEBMOZART_ASSERT")
+load(":pins.bzl", "COMPOSER", "PCOV", "PCRE2_HEADERS", "PHPBENCH", "PHPCS", "PHPSTAN", "PHPSTAN_STRICT_RULES", "PHPUNIT", "PHP_CELLS", "PHP_HEADERS", "PHP_VERSION", "UNUSED_PUBLIC", "WEBMOZART_ASSERT")
 
 HUB_NAME = "dx_php_toolchains"
 
@@ -134,6 +134,7 @@ def _php_impl(mctx):
     for name, file, pin in [
         ("dx_composer", "composer.phar", COMPOSER),
         ("dx_phpunit", "phpunit.phar", PHPUNIT),
+        ("dx_phpbench", "phpbench.phar", PHPBENCH),
         ("dx_phpcs", "phpcs.phar", PHPCS),
         ("dx_phpstan", "phpstan.phar", PHPSTAN),
     ]:
diff --git a/ruby/README.md b/ruby/README.md
index fd05795048..6e556f9ffa 100644
--- a/ruby/README.md
+++ b/ruby/README.md
@@ -47,6 +47,7 @@ ruby_test(
 | `ruby_library` | `rb_library` |
 | `ruby_binary` | `rb_binary`. `srcs` is optional |
 | `ruby_test` | `rb_test`. Set `main` to a runner such as an RSpec bin |
+| `ruby_bench` | `ruby_test` for `dx bench`. `main` calls `DxBench.run` with a benchmark-ips block and reports seconds per call. `ruby_fuzz_test` is not offered yet: ruzzy builds a native extension against libFuzzer |
 
 ## Gems
 
diff --git a/ruby/coverage/pins.bzl b/ruby/coverage/pins.bzl
index 8e8b2670b0..93ad221c39 100644
--- a/ruby/coverage/pins.bzl
+++ b/ruby/coverage/pins.bzl
@@ -15,6 +15,13 @@ RUBY_COVERAGE_GEMS = [
 
 RUBY_COVERAGE_REPOSITORY = "dx_ruby_coverage_gems"
 
+# benchmark-ips for ruby_bench; pure Ruby, no runtime dependencies.
+RUBY_BENCH_GEMS = [
+    struct(name = "benchmark-ips", version = "2.14.0", sha256 = "b72bc8a65d525d5906f8cd94270dccf73452ee3257a32b89fbd6684d3e8a9b1d", entry = "benchmark/ips.rb"),
+]
+
+RUBY_BENCH_REPOSITORY = "dx_ruby_bench_gems"
+
 def gem_url(gem):
     return "https://rubygems.org/downloads/" + gem.name + "-" + gem.version + ".gem"
 
diff --git a/ruby/coverage/repos.bzl b/ruby/coverage/repos.bzl
index 9545232554..638d59f42f 100644
--- a/ruby/coverage/repos.bzl
+++ b/ruby/coverage/repos.bzl
@@ -1,6 +1,6 @@
 """Pinned SimpleCov gems that Ruby tests load under `bazel coverage` (#3954)."""
 
-load(":pins.bzl", "RUBY_COVERAGE_GEMS", "RUBY_COVERAGE_REPOSITORY", "gem_dir", "gem_url")
+load(":pins.bzl", "RUBY_BENCH_GEMS", "RUBY_BENCH_REPOSITORY", "RUBY_COVERAGE_GEMS", "RUBY_COVERAGE_REPOSITORY", "gem_dir", "gem_url")
 
 def _build_file(gems):
     dirs = [gem_dir(gem) for gem in gems]
@@ -14,7 +14,7 @@ def _build_file(gems):
     lines += [
         "        \"simplecov-html-*/public/**\",",
         "        \"simplecov-html-*/views/**\",",
-        "    ]),",
+        "    ], allow_empty = True),",
         "    visibility = [\"//visibility:public\"],",
         ")",
         "",
@@ -31,8 +31,8 @@ def _build_file(gems):
     ]
     return "\n".join(lines)
 
-def _ruby_coverage_gems_impl(ctx):
-    for gem in RUBY_COVERAGE_GEMS:
+def _download_gems(ctx, gems):
+    for gem in gems:
         url = gem_url(gem)
         tmp = "_gem_" + gem.name
         ctx.download_and_extract(
@@ -44,26 +44,37 @@ def _ruby_coverage_gems_impl(ctx):
         )
         data = tmp + "/data.tar.gz"
         if not ctx.path(data).exists:
-            fail("ruby coverage: '" + url + "' holds no data.tar.gz")
+            fail("ruby gems: '" + url + "' holds no data.tar.gz")
         ctx.extract(archive = data, output = gem_dir(gem))
         entry = gem_dir(gem) + "/lib/" + gem.entry
         if not ctx.path(entry).exists:
-            fail("ruby coverage: '" + url + "' holds no lib/" + gem.entry)
+            fail("ruby gems: '" + url + "' holds no lib/" + gem.entry)
         ctx.delete(tmp)
-    ctx.file("BUILD.bazel", _build_file(RUBY_COVERAGE_GEMS))
+    ctx.file("BUILD.bazel", _build_file(gems))
     return ctx.repo_metadata(reproducible = True)
 
+def _ruby_coverage_gems_impl(ctx):
+    return _download_gems(ctx, RUBY_COVERAGE_GEMS)
+
+def _ruby_bench_gems_impl(ctx):
+    return _download_gems(ctx, RUBY_BENCH_GEMS)
+
 _ruby_coverage_gems = repository_rule(
     implementation = _ruby_coverage_gems_impl,
 )
 
+_ruby_bench_gems = repository_rule(
+    implementation = _ruby_bench_gems_impl,
+)
+
 def _ruby_coverage_impl(module_ctx):
     if len(module_ctx.modules) == 0:
-        fail("ruby coverage: the extension is only reachable from a module graph")
+        fail("ruby gems: the extension is only reachable from a module graph")
     _ruby_coverage_gems(name = RUBY_COVERAGE_REPOSITORY)
+    _ruby_bench_gems(name = RUBY_BENCH_REPOSITORY)
     return module_ctx.extension_metadata(reproducible = True)
 
 ruby_coverage = module_extension(
-    doc = "Downloads the pinned, checksum-verified SimpleCov gems as @dx_ruby_coverage_gems.",
+    doc = "Downloads the pinned, checksum-verified SimpleCov gems as @dx_ruby_coverage_gems and benchmark-ips as @dx_ruby_bench_gems.",
     implementation = _ruby_coverage_impl,
 )
diff --git a/ruby/rules/BUILD.bazel b/ruby/rules/BUILD.bazel
index 4d77ed6372..83aeb002a0 100644
--- a/ruby/rules/BUILD.bazel
+++ b/ruby/rules/BUILD.bazel
@@ -6,6 +6,7 @@ load(":wrapper_tests.bzl", "ruby_wrapper_contract_tests")
 package(default_visibility = ["//visibility:public"])
 
 exports_files([
+    "bench_main.rb",
     "defs.bzl",
     "toolchain_tests.bzl",
     "wrapper_tests.bzl",
diff --git a/ruby/rules/bench_main.rb b/ruby/rules/bench_main.rb
new file mode 100644
index 0000000000..7d9e589323
--- /dev/null
+++ b/ruby/rules/bench_main.rb
@@ -0,0 +1,28 @@
+# frozen_string_literal: true
+
+require "json"
+
+ips_entry = ENV.fetch("DX_BENCH_IPS")
+$LOAD_PATH.unshift(File.dirname(File.dirname(File.join(ENV.fetch("TEST_SRCDIR"), ips_entry))))
+require "benchmark/ips"
+
+# Runs a benchmark-ips block and writes dx-bench.json for `dx bench`.
+module DxBench
+  def self.run(time: 0.5, warmup: 0.2, &block)
+    report = Benchmark.ips(time, warmup, true, &block)
+    results = report.entries.map do |entry|
+      ips = entry.stats.central_tendency
+      {
+        name: entry.label.to_s,
+        unit: "s",
+        mean: 1.0 / ips,
+        stddev: entry.stats.error / (ips * ips),
+        iterations: entry.iterations
+      }
+    end
+    File.write(File.join(ENV.fetch("TEST_UNDECLARED_OUTPUTS_DIR"), "dx-bench.json"),
+              JSON.generate(schema: "dx-bench/v1", results: results))
+  end
+end
+
+load File.join(ENV.fetch("TEST_SRCDIR"), ENV.fetch("DX_BENCH_SCRIPT"))
diff --git a/ruby/rules/defs.bzl b/ruby/rules/defs.bzl
index d7e9f06240..8a1ebc9b02 100644
--- a/ruby/rules/defs.bzl
+++ b/ruby/rules/defs.bzl
@@ -3,6 +3,7 @@
 load("@rules_ruby//ruby:defs.bzl", _rb_binary = "rb_binary", _rb_library = "rb_library", _rb_test = "rb_test")
 load("@rules_ruby//ruby/private:providers.bzl", "BundlerInfo", "RubyFilesInfo")
 load("//libs/starlark:entry.bzl", "dx_entry_quality_srcs")
+load("//libs/starlark:fuzz_bench.bzl", "merge_tags")
 load("//libs/starlark:wrapper.bzl", "DX_EXEC_PROVIDES", "dx_executable_forward_rule", "dx_lcov_merger_attr", "dx_library_forward_rule", "dx_wrap", "dx_wrap_binary", "dx_wrap_test")
 load("//quality:sources.bzl", "QualitySourcesInfo")
 load("//ruby/coverage:pins.bzl", "RUBY_COVERAGE_GEMS", "gem_dir")
@@ -107,3 +108,20 @@ def ruby_test(name, *, srcs = None, main = None, visibility = None, **kwargs):
     """Minimal wrapper over rb_test. Set main to a runner such as an RSpec bin; main is linted unless it is an external label."""
     upstream = dict(kwargs, main = main) if main != None else kwargs
     dx_wrap_test(name, _rb_test, _ruby_forward_test, srcs, visibility = visibility, upstream_kwargs = upstream, quality_srcs = dx_entry_quality_srcs(main, srcs), **kwargs)
+
+def ruby_bench(name, main, srcs = None, data = None, env = None, tags = None, **kwargs):
+    """A ruby_test run by dx bench: `main` calls DxBench.run with a benchmark-ips block, which writes dx-bench.json."""
+    ips = Label("@dx_ruby_bench_gems//:benchmark-ips-2.14.0/lib/benchmark/ips.rb")
+    ruby_test(
+        name = name,
+        srcs = (srcs or []) + [main, Label("//ruby/rules:bench_main.rb")],
+        main = Label("//ruby/rules:bench_main.rb"),
+        data = (data or []) + [ips, Label("@dx_ruby_bench_gems//:lib")],
+        env = dict(
+            env or {},
+            DX_BENCH_IPS = "$(rlocationpath %s)" % ips,
+            DX_BENCH_SCRIPT = "$(rlocationpath %s)" % main,
+        ),
+        tags = merge_tags(tags, "dx-bench", "manual"),
+        **kwargs
+    )