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fix(stress): stagger john GPU launches to prevent GWS tuning contention

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When 8 john processes start simultaneously they race for GPU memory during
OpenCL GWS auto-tuning. Slower devices settle on a smaller work size (~594MiB
vs 762MiB) and run at 40% instead of 100% load. Add 3s sleep between launches
so each instance finishes memory allocation before the next one starts.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Michael Chus
2026-04-01 23:44:00 +03:00
parent 1dd7f243f5
commit 348db35119
1 changed files with 3 additions and 0 deletions
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3
iso/overlay/usr/local/bin/bee-john-gpu-stress
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@@ -191,7 +191,10 @@ CHOSEN_FORMAT=$(choose_format) || {
echo "format=${CHOSEN_FORMAT}" echo "format=${CHOSEN_FORMAT}"
PIDS="" PIDS=""
_first=1
for opencl_id in $(echo "${JOHN_DEVICES}" | tr ',' ' '); do for opencl_id in $(echo "${JOHN_DEVICES}" | tr ',' ' '); do
[ "${_first}" = "1" ] || sleep 3
_first=0
./john --test="${SECONDS}" --format="${CHOSEN_FORMAT}" --devices="${opencl_id}" & ./john --test="${SECONDS}" --format="${CHOSEN_FORMAT}" --devices="${opencl_id}" &
PIDS="${PIDS} $!" PIDS="${PIDS} $!"
done done