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build: voltip-server 的发布构建拆成 16 个代码生成单元 - #246
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发版候选的 Linux 腿每次都卡在打包 voltip-server：0.3.1 的候选这一步 19.3 分钟， 更早几次 27.7–34.3 分钟。release profile 的 codegen-units = 1 让这个 crate 成为一个 LLVM 模块，-Z time-passes 测得 LLVM 优化 862.7 秒（其余阶段合计不到 1 秒），ThinLTO 链接又 302.7 秒。 只给 voltip-server 设 16 个单元，其余包不变。本机 4 个并行任务下，库 1.7 秒、可执行 文件 24.5 秒；scripts/build-server-linux-x64.sh 冷构建加打包、无头运行检查共 144 秒， 包比 0.3.1 大 2.5%。发布脚本测试检查这项配置。
Codecov Report✅ All modified and coverable lines are covered by tests. @@ Coverage Diff @@
## main #246 +/- ##
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- Coverage 93.57% 93.56% -0.01%
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Files 489 489
Lines 85860 85860
Branches 4909 4909
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- Hits 80340 80337 -3
- Misses 4851 4854 +3
Partials 669 669
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This was referenced Nov 10, 2026
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问题
发版候选的 Linux 腿每次都是最慢的一条，时间几乎都花在打包 voltip-server 上：0.3.1 的候选（42733161564）这一步 19.3 分钟，更早的几次 27.7–34.3 分钟。
release profile 设了
codegen-units = 1，voltip-server 整个 crate 因此是一个 LLVM 模块。本机用-Z time-passes测：LLVM 优化 862.7 秒，其余阶段合计不到 1 秒；可执行文件的 ThinLTO 链接 302.7 秒。桌面端主 crate 在同样设置下只要 1–2 分钟，所以问题出在这个模块的优化耗时急剧膨胀，不在代码量。改动
Cargo.toml只给 voltip-server 设codegen-units = 16，其余包仍是一个单元，ThinLTO 照样跨单元优化。ServerPackageBuild检查这项配置；改动前它失败（None != 16）。docs/runbook.md「CI 的速度」记下原因和数字。验证（本机）
scripts/build-server-linux-x64.sh从零构建、打包并无头运行检查，共 144 秒（改动前单服务端构建就要 20 分钟以上）：--version输出voltip-server 0.3.1，--list-models5 条，--list-compute正常，库都来自包内。make verify通过（overall_exit=0 commit=cdb603d9）。PR CI 不构建服务端发布包，效果在下一次发版候选里看：Linux 腿的服务端一步预期从 19–34 分钟降到几分钟。