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lix/doc/manual/rl-next/build-timing-analysis.md

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Enable clang build timing analysis I didn't enable this by default for clang due to making the build time 10% worse or so. Unfortunate, but tbh devs for whom 10% of build time is not *that* bad should probably simply enable this. Change-Id: I8d1e5b6f3f76c649a4e2f115f534f7f97cee46e6
2024-03-19 06:03:48 +00:00
---
synopsis: Clang build timing analysis
cls: 587
Remove rl-next-dev We realized that there's really no good place to put these dev facing bulletins, and the user-facing release notes aren't really the worst place to put them, I guess, and we do kind of hope that it converts users to devs. Change-Id: Id9387b2964fe291cb5a3f74ad6344157f19b540c
2024-06-06 09:08:20 +00:00
category: Development
Enable clang build timing analysis I didn't enable this by default for clang due to making the build time 10% worse or so. Unfortunate, but tbh devs for whom 10% of build time is not *that* bad should probably simply enable this. Change-Id: I8d1e5b6f3f76c649a4e2f115f534f7f97cee46e6
2024-03-19 06:03:48 +00:00
---
We now have Clang build profiling available, which generates Chrome
tracing files for each compilation unit. To enable it, run `meson configure
Remove rl-next-dev We realized that there's really no good place to put these dev facing bulletins, and the user-facing release notes aren't really the worst place to put them, I guess, and we do kind of hope that it converts users to devs. Change-Id: Id9387b2964fe291cb5a3f74ad6344157f19b540c
2024-06-06 09:08:20 +00:00
build -Dprofile-build=enabled` in a Clang stdenv (`nix develop
.#native-clangStdenvPackages`) then rerun the compilation.
Enable clang build timing analysis I didn't enable this by default for clang due to making the build time 10% worse or so. Unfortunate, but tbh devs for whom 10% of build time is not *that* bad should probably simply enable this. Change-Id: I8d1e5b6f3f76c649a4e2f115f534f7f97cee46e6
2024-03-19 06:03:48 +00:00
If you want to make the build go faster, do a clang build with meson, then run
`maintainers/buildtime_report.sh build`, then contemplate how to improve the
build time.
You can also look at individual object files' traces in
<https://ui.perfetto.dev>.
Remove rl-next-dev We realized that there's really no good place to put these dev facing bulletins, and the user-facing release notes aren't really the worst place to put them, I guess, and we do kind of hope that it converts users to devs. Change-Id: Id9387b2964fe291cb5a3f74ad6344157f19b540c
2024-06-06 09:08:20 +00:00
See [the wiki page][improving-build-times-wiki] for more details on how to do
this.
[improving-build-times-wiki]: https://wiki.lix.systems/link/8#bkmrk-page-title
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