Fix sporadic test failures by avoiding excessive compiler memory consumption#5383
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StephanTLavavej merged 1 commit intomicrosoft:mainfrom Apr 10, 2025
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This addresses all of the tests that were consuming 3+ GB for x86 /analyze:only: Test | Before | After | -------------------------------------|--------------:|--------------:| `P0896R4_ranges_alg_copy` | 3,036,147,712 | 657,166,336 | `P0896R4_ranges_alg_transform_unary` | 3,199,823,872 | 695,132,160 | `P2321R2_views_adjacent` | 3,887,595,520 | 1,020,297,216 | `P2321R2_views_adjacent_transform` | 3,404,570,624 | 940,150,784 | `P2441R2_views_join_with` | 3,391,266,816 | 892,010,496 |
davidmrdavid
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Mar 31, 2025
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I'm mirroring this to the MSVC-internal repo - please notify me if any further changes are pushed. |
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Fixes internal VSO-2431296, where
P2321R2_views_adjacentis sporadically running out of memory for x86-native/analyze:onlyconfigurations. (Internal builds of the compiler have a bit more debug logic than retail builds, which is why we haven't seen these failures in our GitHub PR/CI system.)Related:
Our stressful ranges/views tests, combined with Static Analysis's increased compiler memory consumption, interact poorly with the ABSOLUTE ABOMINATION of x86-hosted toolsets in the year 2025.
I modified #3567's incantations to find all of the tests that were consuming 3+ GB for x86-native
/analyze:only, then added our usual workarounds, reducing the peak working set sizes (in bytes) to reasonable levels:P0896R4_ranges_alg_copyP0896R4_ranges_alg_transform_unaryP2321R2_views_adjacentP2321R2_views_adjacent_transformP2441R2_views_join_withAs usual, the workarounds are architecture-independent, since consuming tons of memory isn't great even for properly x64-hosted compilers.
I also checked the plain configurations (original recipe C1XX, not extra crispy
/analyze:only). There are only a few at 2+ GB for x86-native, and none over 3 GB, so while they're still concerning, they aren't risking OOM:P2374R4_views_cartesian_product_recommended_practicesP0896R4_ranges_alg_mismatchP2321R2_views_adjacentP2374R4_views_cartesian_product(Note that
/analyze:onlyis just a variant of/analyzethat skips codegen.)