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fix(core): use os.availableParallelism() for SSG worker threads count #10915

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Feb 7, 2025
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fix(core): use os.availableParallelism() for SSG worker threads count #10915

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12 changes: 9 additions & 3 deletions packages/docusaurus/src/ssg/ssgExecutor.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -80,11 +80,17 @@ function getNumberOfThreads(pathnames: string[]) {
if (typeof SSGWorkerThreadCount !== 'undefined') {
return SSGWorkerThreadCount;
}

// See also https://github.com/tinylibs/tinypool/pull/108
const cpuCount =
// TODO Docusaurus v4: bump node, availableParallelism() now always exists
typeof os.availableParallelism === 'function'
? os.availableParallelism()
: os.cpus().length;

return inferNumberOfThreads({
pageCount: pathnames.length,
// TODO use "physical CPUs" instead of "logical CPUs" (like Tinypool does)
// See also https://github.com/tinylibs/tinypool/pull/108
cpuCount: os.cpus().length,
cpuCount,
// These are "magic value" that we should refine based on user feedback
// Local tests show that it's not worth spawning new workers for few pages
minPagesPerCpu: 100,
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