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doc: add note on process memoryUsage #59026

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doc: add rss leak note on process memoryUsage
fengmk2 Jul 11, 2025
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Update process.md
fengmk2 Jul 11, 2025
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fengmk2 Jul 11, 2025
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Update doc/api/process.md
fengmk2 Jul 11, 2025
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fengmk2 Jul 11, 2025
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8 changes: 8 additions & 0 deletions doc/api/process.md
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Expand Up @@ -2807,6 +2807,13 @@ The `process.memoryUsage()` method iterates over each page to gather
information about memory usage which might be slow depending on the
program memory allocations.

### A note on process memoryUsage

On Linux or other systems where glibc is commonly used, an application may have sustained
`rss` growth despite stable `heapTotal` due to fragmentation caused by the glibc `malloc`
implementation. See [nodejs/node#21973][] on how to switch to an alternative `malloc`
implementation to address the performance issue.

## `process.memoryUsage.rss()`

<!-- YAML
Expand Down Expand Up @@ -4547,6 +4554,7 @@ cases:
[debugger]: debugger.md
[deprecation code]: deprecations.md
[loading ECMAScript modules using `require()`]: modules.md#loading-ecmascript-modules-using-require
[nodejs/node#21973]: https://github.com/nodejs/node/issues/21973
[note on process I/O]: #a-note-on-process-io
[process.cpuUsage]: #processcpuusagepreviousvalue
[process_emit_warning]: #processemitwarningwarning-type-code-ctor
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