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tools / heap-visualizer

Heap / Memory Event Visualizer

Analyze allocation/free logs, heap growth, leak symptoms, GC pressure, OOM clues, and suspicious object lifecycle patterns.

P2PerformanceHigh severity
100
debug signal score
4 signals

4 signals detected. Start with out-of-memory failure.

Detected signals

Out-of-memory failure

The process ran out of memory or hit memory pressure.

Capture heap snapshot near failure and identify dominant retained types.

Heap growth pattern

Memory appears to grow or retain unexpectedly.

Compare snapshots before/after the workflow and inspect retaining paths.

GC pressure

Garbage collection is part of the symptom.

Separate allocation rate from retained memory and check pause distribution.

High object count

Object counts or retained instances are available.

Sort by retained size and instance count, then inspect ownership.

Highlighted lines
line 1
OutOfMemoryError Java heap space
Out-of-memory failure
line 2
heap used 128MB -> 512MB
Heap growth pattern
line 3
retained objects: UserSession x12000
Heap growth patternHigh object count
line 4
GC overhead limit exceeded
GC pressure
Fix checklist
Capture heap snapshot near failure and identify dominant retained types.
Compare snapshots before/after the workflow and inspect retaining paths.
Separate allocation rate from retained memory and check pause distribution.
Sort by retained size and instance count, then inspect ownership.
Capture baseline and post-action snapshots.
Sort by retained size, not just shallow size.
Identify the retaining path and lifecycle owner.

DebugTools product

Heap / Memory Event Visualizer

Heap / Memory Event Visualizer is a focused DebugTools mini-product for developers. Analyze allocation/free logs, heap growth, leak symptoms, GC pressure, OOM clues, and suspicious object lifecycle patterns.

Use cases

  • Identify slow paths, hot operations, large bundles, and runtime bottlenecks.
  • Compare before/after evidence while tuning performance.
  • Summarize profiler output into follow-up actions.

How it works

  • Paste or load the snippet you want to inspect in Heap / Memory Event Visualizer.
  • Run the tool in the browser and review the highlighted output.
  • Copy, export, or turn the result into the next debugging step.

Privacy

  • Heap / Memory Event Visualizer is local-first. The core workflow runs in your browser and does not require sending pasted content to DebugTools servers.

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