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aduh95 merged 21 commits into from
Jun 17, 2022
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doc: add new useful V8 option #42575

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Remove recommended value for max_semi_space_size
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Expand Up @@ -1980,6 +1980,23 @@ On a machine with 2 GB of memory, consider setting this to
$ node --max-old-space-size=1536 index.js
```

### `--max_semi_space_size=SIZE` (in megabytes)
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Sets the maximum
[semi\_space](https://www.memorymanagement.org/glossary/s.html#semi.space)
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size for V8's [scavenge](https://v8.dev/blog/orinoco-parallel-scavenger)
garbage collector.
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Increase the value of max\_semi\_space\_size may bring
the throughput improvement for node and the cost is more memory consumption.
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The actual throughput improvement and memory consumption
are relevant to your application
([reference](https://github.com/nodejs/node/issues/42511)).
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@aduh95 aduh95 Apr 2, 2022

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I'm not sure I understand this sentence, do you mean it's relevant to any Node.js application, and if so, how do you know?

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@JialuZhang-intel JialuZhang-intel Apr 3, 2022

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I tuned the max_semi_space_size value and tested it on two workloads, this is the results:
img
From the figure we can see that the trend of throughput improve are similar on both workloads, but the absolute value are different. I just want the user to test and choose the optimal configuration for their own application.


_The default max\_semi\_space\_size is
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16MB for 64-bit systems and 8MB for 32-bit systems.
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The recommended value is 64MB or 128MB if your system has enough
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memory._

[Chrome DevTools Protocol]: https://chromedevtools.github.io/devtools-protocol/
[CommonJS]: modules.md
[ECMAScript module loader]: esm.md#loaders
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