[not-matthias]

TLDR: Go benchmarks that draw from the global math/rand got a random seed on every run. The runner now sets GODEBUG=randautoseed=0 in every mode, so it starts from Seed(1).

• randautoseed=0 is put in front of the user's GODEBUG. Go uses the last value for each setting, so the user's settings stay and an explicit randautoseed from the user still wins.
• ASLR in walltime and memory mode is not changed.

Refs COD-4013

[codspeed]

Merging this PR will not alter performance

2 warnings

⚠️ Walltime results may be unreliable

Some benchmarks used the Walltime instrument outside CodSpeed Macro Runners, which can make the results inconsistent.

Learn more about Macro Runners

See affected benchmarks

⚠️ 8 benchmarks are dominated by system calls

System calls cannot be simulated consistently and are left out of the measure. The reported value understates the real cost. Switch to the Walltime instrument to measure them.

Learn more about system calls

See affected benchmarks

✅ 41 untouched benchmarks
⏩ 6 skipped benchmarks¹

---

_{Comparing cod-4013-disable-aslr-in-walltimememory-and-fix-go-mathrand-seed-in (fe3c0c6) with main (d14d95d)}

Footnotes

1. 6 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[greptile-apps]

Confidence Score: 5/5

[Medium impact] The PR appears safe to merge; no new actionable issues were found.

Summary

The runner now adds GODEBUG=randautoseed=0 in every measurement mode.

• Go benchmarks start with the same global random sequence by default.

_{Reviews (2) · Last reviewed commit: "feat: seed Go's global math/rand determi..." · Reviewed by Greptile}

[GuillaumeLagrange]

lgtm