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fix(perf-sensor): CRaC warm-up bounds each request to 10 s and skips … #953

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Merged
ybezsonov merged 1 commit into from
Oct 13, 2026
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fix(perf-sensor): CRaC warm-up bounds each request to 10 s and skips … #953

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7 changes: 4 additions & 3 deletions apps/perf-sensor/skills/java-on-eks-optimization/references/Dockerfile.crac
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Original file line number Diff line number Diff line change
Expand Up @@ -35,8 +35,9 @@ RUN --mount=type=cache,target=/root/.m2 mvn clean package -DskipTests -ntp && mv
# has never served a request, so the restored JVM starts in 0.2 s and then JITs the whole
# request path under production load (seconds of compilation on a 1-vCPU quota: throttling
# and latency in the first minutes). Start the app, drive WARMUP_REQUESTS through the hot
# path, then checkpoint with jcmd. Open FDs are reported (collect-fd-stacktraces) so a
# missing Resource hook fails loudly.
# path, then checkpoint with jcmd. Each warm-up request is bounded to 10 s and a failed one
# is skipped: the warm-up only compiles the hot path, one request must not stop the build.
# Open FDs are reported (collect-fd-stacktraces) so a missing Resource hook fails loudly.
# GC, HEAP BOUNDS AND CPU COUNT ARE BAKED INTO THE CHECKPOINT and cannot change at restore:
# - GC: SerialGC for a <= 1 vCPU pod (the CRaC JDK would otherwise default to G1).
# - Heap: JAVA_HEAP_OPTS sets -Xmx/-Xms from the pod's memory limit (75 % / 50 % of
Expand Down Expand Up @@ -70,7 +71,7 @@ RUN --mount=type=secret,id=db-password set -e; \
-jar /app.jar & PID=$!; \
for i in $(seq 1 90); do curl -sf http://localhost:8080/actuator/health >/dev/null 2>&1 && break; sleep 1; done; \
curl -sf http://localhost:8080/actuator/health >/dev/null; \
for i in $(seq 1 ${WARMUP_REQUESTS}); do eval "${WARMUP_CMD}"; done; \
for i in $(seq 1 ${WARMUP_REQUESTS}); do timeout 10 sh -c "${WARMUP_CMD}" || true; done; \
sleep 2; jcmd ${PID} JDK.checkpoint; wait ${PID} || true; \
test -d /opt/crac-files

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