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Docs: Add note about libvips thread pool sizing

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Lovell Fuller 2025-09-19 13:13:53 +01:00
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docs/src/content/docs/performance.md
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@ -24,6 +24,10 @@ except when using glibc-based Linux without jemalloc, where the default is `1` t
Use [`sharp.concurrency()`](/api-utility/#concurrency) to manage the number of threads per image.
The size of the shared thread pool will grow on demand and shrink when idle.
For control over this, set the `VIPS_MAX_THREADS` environment variable
to a value between 4 and 1024 to pre-allocate the thread pool at process start.
To reduce memory fragmentation when using the default Linux glibc memory allocator, set the
[`MALLOC_ARENA_MAX`](https://www.gnu.org/software/libc/manual/html_node/Memory-Allocation-Tunables.html)
environment variable before the Node.js process starts to reduce the number of memory pools.