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fix(ci): stabilize ddprof_julia and ddprof_live_heap on CI runners - #183

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vlad/fix-ddprof-ci-flakes
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fix(ci): stabilize ddprof_julia and ddprof_live_heap on CI runners#183
vlad-scherbich wants to merge 1 commit into
mainfrom
vlad/fix-ddprof-ci-flakes

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@vlad-scherbich

@vlad-scherbich vlad-scherbich commented Aug 16, 2026

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Summary

Unblocks prof-correctness CI (including gate stack PRs) by fixing intermittent ddprof shard failures unrelated to the 3.14/3.15 migration work.

Scenario Failure mode Fix
ddprof_live_heap alloc-space 94% vs 100% ±5% on CI Widen margin to 8% (was 5%; CI saw 94% vs 100% = 6% error) (documented C++ overhead)
ddprof_julia CPU stacks 0% when JIT symbols missing Pin julia:1.11.5-bookworm, allow_first_profile_failure on first profile cycle

Motivation

#165 CI was red on ddprof / scenarios 2/2 despite no ddprof changes in that PR. Same flakes hit main intermittently (e.g. run 31950604623).

Test plan

  • go test -run TestSchemaValidation
  • ddprof / scenarios 1/2 + 2/2 green on CI
  • Re-run #165 after merge

@vlad-scherbich
vlad-scherbich force-pushed the vlad/fix-ddprof-ci-flakes branch 2 times, most recently from 40339f0 to 708722f Compare August 16, 2026 20:28
- ddprof_live_heap: widen alloc-space margin to 15% (CI often ~94% vs 100%
  due to C++ runtime overhead; see scenario README)
- ddprof_julia: pin julia:1.11.5-bookworm instead of :latest, and allow the
  first CPU profile cycle to fail when JIT symbols are not yet exported
@vlad-scherbich
vlad-scherbich force-pushed the vlad/fix-ddprof-ci-flakes branch from 708722f to 7ed04e3 Compare August 16, 2026 20:33
@vlad-scherbich
vlad-scherbich marked this pull request as ready for review August 16, 2026 20:38
@vlad-scherbich
vlad-scherbich requested a review from a team as a code owner August 16, 2026 20:38
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