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tools / jvm-gc-log

JVM GC Log

Analyze JVM GC logs for pause spikes, allocation pressure, heap tuning clues, promotion failures, and memory regressions.

P2DevOps / ObservabilityHigh severity
85
debug signal score
3 signals

3 signals detected. Start with long gc pause.

Detected signals

Long GC pause

GC pauses are long enough to affect latency.

Compare pause type, heap before/after, allocation rate, and SLA budget.

Allocation failure

The JVM struggled to allocate or promote objects.

Check allocation rate, old-gen pressure, survivor sizing, and object lifetime.

Heap before/after data

Heap occupancy data is present.

Track whether used heap returns to baseline after GC.

Highlighted lines
line 1
[2.345s][info][gc] GC(12) Pause Young 512M->128M(1024M) 250.123ms
Long GC pauseHeap before/after data
line 2
Full GC Allocation Failure
Long GC pauseAllocation failure
line 3
Promotion failed
Allocation failure
Fix checklist
Compare pause type, heap before/after, allocation rate, and SLA budget.
Check allocation rate, old-gen pressure, survivor sizing, and object lifetime.
Track whether used heap returns to baseline after GC.
Plot pause time and heap after GC over time.
Separate young, mixed, and full collections.
Correlate with traffic and deploy events.

DebugTools product

JVM GC Log

JVM GC Log is a focused DebugTools mini-product for developers. Analyze JVM GC logs for pause spikes, allocation pressure, heap tuning clues, promotion failures, and memory regressions.

Use cases

  • Inspect CI, Kubernetes, trace, SQL, JVM, and production incident signals.
  • Move from noisy output to the next command or measurement to run.
  • Create an investigation note that is easy for teammates to follow.

How it works

  • Paste or load the snippet you want to inspect in JVM GC Log.
  • Run the tool in the browser and review the highlighted output.
  • Copy, export, or turn the result into the next debugging step.

Privacy

  • JVM GC Log is local-first. The core workflow runs in your browser and does not require sending pasted content to DebugTools servers.

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