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6f3297a4a0
The bounds in #7667 were set below what one build configuration writes, so ccache filled to its limit and evicted the entries the next build was about to ask for. The probe measured what that costs: a 6G cache on one leg served 1059 of 1059 calls and the 700M bound on the same leg served 14%. The quota also went to legs that finish under the Windows leg, which has no compiler cache. Debug information is most of an object's size. A measured Arch Debug configuration is 1.2 GB with the built-in flags and 660 MB at -g1; Debian 13 Release is 1.1 GB and 614 MB. CI therefore builds every non-tag leg at level 1 through a new COCKATRICE_DEBUG_INFO_LEVEL option, which stays empty by default so local, distro and release builds are unchanged. Level 1 keeps file and line, which is what a failing test or a sanitizer backtrace reports. Tags and the nightly legs keep full DWARF for the Sentry symbols. With one configuration at half the size, the quota goes to fewer legs at a size that holds one whole configuration, and the legs that duplicate another leg's coverage give their cache up: Servatrice, Ubuntu 26.04 behind the sanitize leg of the same distro, macOS 15 and macOS 26 Debug behind macOS 14. Their keys leave LIVE_CCACHE_KEYS, so prune-caches reclaims the existing entries. Fedora 44 built Debug for the suite and Release for the package in one job, so the package compile queued behind the debug one and the leg took 30.8 min - the only leg above Windows - while one 1.6 GB cache held two configurations. It is split into two legs with one cache each, running in parallel. The option reaches compile.sh inside the container through docker.sh, and compile.sh turns it into the CMake flag. Bounds: Arch 850M, Debian 13 800M, Fedora 44 debug 850M and release 800M, Ubuntu 26.04 sanitize 1200M, macOS 14 800M. That is 5.3 GB of compiler cache on top of roughly 4.5 GB of buildkit, vcpkg, Qt and CodeQL entries. Windows still sets the pull-request wall clock: 29.5 min, 23.7 of it compiling with no compiler cache, because ccache and sccache cannot store the 711 of 1054 translation units that use PCH under MSVC (#7381). That is a separate trial. |
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