Reduce default concurrency for musl thread over-subscription

lovell/sharp-libvips#229
lovell · Apr 30, 2024 · da655a1 · da655a1
1 parent 93c615d
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diff --git a/docs/changelog.md b/docs/changelog.md
@@ -8,6 +8,8 @@ Requires libvips v8.15.2
 
 * Remove experimental status from `pipelineColourspace`.
 
+* Reduce default concurrency when musl thread over-subscription detected.
+
 * TypeScript: add missing definitions for `OverlayOptions`.
   [#4048](https://github.com/lovell/sharp/pull/4048)
   [@ike-gg](https://github.com/ike-gg)

diff --git a/lib/utility.js b/lib/utility.js
@@ -153,6 +153,9 @@ function concurrency (concurrency) {
 if (detectLibc.familySync() === detectLibc.GLIBC && !sharp._isUsingJemalloc()) {
   // Reduce default concurrency to 1 when using glibc memory allocator
   sharp.concurrency(1);
+} else if (detectLibc.familySync() === detectLibc.MUSL && sharp.concurrency() === 1024) {
+  // Reduce default concurrency when musl thread over-subscription detected
+  sharp.concurrency(require('node:os').availableParallelism());
 }
 
 /**