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Fix oom when running unit tests in CI (#5284)

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* fix oom when testing

Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>

* right-size CI test runners

the `r` family and `ram=32+128` were sized for the tmpfs footprint rather
than the workload. with the caches back on disk the build+test peak fits in
16GB, so move to `m`/`c` at `ram=16+32`.

- ~27% cheaper per instance-hour on spot, and a much deeper pool to schedule
  against (~20 x86 types vs 7)
- `cpu=4+8` with `ram=16+32` lets price-capacity-optimized opportunistically
  land an 8 vCPU box when it's cheap
- plain `volume=100gb` replaces the provisioned throughput. a 4 vCPU instance
  caps near 150MB/s of EBS and gp3's free baseline is already 125MB/s, so the
  override bought nothing

Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>

---------

Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>
This commit is contained in:
Alex Goodman
2026-09-11 14:58:30 -04:00
committed by GitHub
parent de98400c39
commit eb58f698bd
2 changed files with 16 additions and 3 deletions
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.github/workflows/validations.yaml
+5 -2
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@@ -21,10 +21,13 @@ jobs:
name: "Static analysis"
# runs-on.com: memory & general purpose instances for testing
# spot enabled: ok to interrupt non-production workloads
# tmpfs: faster io-intensive workflows
# tmpfs intentionally omitted -- it RAM-backs /home/runner, /tmp and /var/lib/docker at
# 100% of instance memory, starving `make unit` of headroom to link with -race.
# volume: the caches and docker images tmpfs used to hold. gp3 baseline throughput is
# enough; a 4 vCPU instance can't pull much more than that anyway.
# note: s3-cache intentionally omitted -- PR runs are untrusted and must not write to the
# shared cache backend that the trusted release workflow reads from (cache poisoning).
runs-on: &test-runner "runs-on=${{ github.run_id }}/cpu=4+8/ram=32+128/family=r5+r6+r7+r8+m4+m5+m6+m7+m8/spot=price-capacity-optimized/extras=tmpfs"
runs-on: &test-runner "runs-on=${{ github.run_id }}/cpu=4+8/ram=16+32/family=m5+m6+m7+m8+c5+c6+c7+c8/spot=price-capacity-optimized/volume=100gb"
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