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[CI] Measure what debug info costs a ccache entry

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Throwaway diagnostic, not for merge. Adds COCKATRICE_DEBUG_INFO_LEVEL (cache
option, empty by default, so local and release builds are unchanged) and runs
the Arch debug leg and the Debian 13 release leg cold with -g0 and -g1 against a
6G bound, so the cache size of each configuration can be compared with the
1.2 GB the default flags produce.

One Arch configuration costs 1.2 GB with the default flags and a cache bigger
than that served 1058 of 1059 calls, so the per-leg bounds cannot hold a build
and evict what the next one asks for. This measures whether dropping DWARF is
what makes a whole configuration fit.
This commit is contained in:
Lukas Brübach 2026-11-04 12:29:41 +01:00
parent a1069edd8a
commit 2bf0e3f93a
3 changed files with 73 additions and 59 deletions
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19
CMakeLists.txt
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@ -238,6 +238,25 @@ include(Sanitizers)
include(Coverage)
include(CrashReporting)
# Debug info is what makes a cached object large. With full DWARF one build configuration
# needs more room than a per-leg compiler-cache bound can spare, and ccache then evicts the
# entries the next build is about to ask for: the cache fills to its limit and still serves
# only a fraction of the calls. CI sets a lower level so that one whole configuration fits a
# bound; level 1 keeps file and line, which is what a failing test or a sanitizer backtrace
# needs. Empty (the default) leaves local, distro and release builds exactly as they were,
# and the append below comes after CrashReporting, so its -g cannot raise the level again.
set(COCKATRICE_DEBUG_INFO_LEVEL ""
CACHE STRING "DWARF level for Debug and Release objects (empty keeps the built-in flags)"
)
if(COCKATRICE_DEBUG_INFO_LEVEL)
if(MSVC)
message(WARNING "COCKATRICE_DEBUG_INFO_LEVEL is ignored on MSVC")
else()
string(APPEND CMAKE_CXX_FLAGS_DEBUG " -g${COCKATRICE_DEBUG_INFO_LEVEL}")
string(APPEND CMAKE_CXX_FLAGS_RELEASE " -g${COCKATRICE_DEBUG_INFO_LEVEL}")
endif()
endif()
# GNU systems need to define the Mersenne exponent for the RNG to compile w/o warning
if(CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
add_definitions("-DSFMT_MEXP=19937")