worker: add worker.getMemoryUsage() API #60778
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Codecov Report❌ Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## main #60778 +/- ##
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- Coverage 88.57% 88.54% -0.04%
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Files 703 703
Lines 208256 208347 +91
Branches 40158 40174 +16
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+ Hits 184469 184486 +17
- Misses 15824 15851 +27
- Partials 7963 8010 +47
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addaleax
reviewed
Nov 19, 2025
| Number::New(isolate, heap_stats.external_memory()), | ||
| Number::New(isolate, allocator == nullptr | ||
| ? 0 | ||
| : allocator->total_mem_usage()), |
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There's no guarantee that allocator is still alive at this point
addaleax
reviewed
Nov 19, 2025
| <!-- YAML | ||
| added: | ||
| changes: | ||
| - version: v25.2.0 |
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| - version: v25.2.0 | |
| - version: REPLACEME |
addaleax
reviewed
Nov 19, 2025
| `SharedArrayBuffer` instances within the worker. | ||
| The returned `Promise` rejects with [`ERR_WORKER_NOT_RUNNING`][] if called after | ||
| the worker has stopped. |
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This should explain the relationship to worker.getHeapStatistics() and how it differs from that
Flarna
reviewed
Nov 19, 2025
| Returns an object mirroring [`process.memoryUsage()`][] but scoped to the | ||
| worker's isolate: | ||
| * `rss` {integer} Resident Set Size. This value represents the RSS reported by |
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Isn't RSS a per process thing?
Therefore RSS value should be the same on all workers so quite pointless to read it from a different thread.
Flarna
reviewed
Nov 19, 2025
| added: | ||
| changes: | ||
| - version: v25.2.0 | ||
| pr-url: https://github.com/nodejs/node/pull/REPLACEME |
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| pr-url: https://github.com/nodejs/node/pull/REPLACEME | |
| pr-url: https://github.com/nodejs/node/pull/60778 |
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Summary
worker.getMemoryUsage()so worker threads can report RSS, heap usage, external memory, and ArrayBuffer statistics.WorkerMemoryUsageTakerplus the per-isolate templates/bindings to expose this data.test/parallel/test-worker-get-memory-usage.js) and document the API indoc/api/worker_threads.md.Testing
python3 tools/test.py parallel/test-worker-get-memory-usageninja -C out/Debug node