svemagie/blog-eleventy-indiekit
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perf: force V8 garbage collection after Eleventy builds

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Add global.gc() call in eleventy.after handler to release unused heap
pages back to the OS. Without this, V8 keeps ~2 GB of build-time
allocations resident in watch mode because there's no allocation
pressure to trigger GC naturally. Requires --expose-gc in NODE_OPTIONS
(set in start.sh for the watcher process).

Confab-Link: http://localhost:8080/sessions/edb1b7b0-da66-4486-bd9c-d1cfa7553b88
This commit is contained in:
Ricardo
2026-03-08 12:52:42 +01:00
parent 254d5069f7
commit 229f770cbb
1 changed files with 13 additions and 0 deletions
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13
eleventy.config.js
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@@ -1333,6 +1333,19 @@ export default function (eleventyConfig) {
}
}
// Force garbage collection after post-build work completes.
// V8 doesn't return freed heap pages to the OS without GC pressure.
// In watch mode the watcher sits idle after its initial full build,
// so without this, ~2 GB of build-time allocations stay resident.
// Requires --expose-gc in NODE_OPTIONS (set in start.sh for the watcher).
if (typeof global.gc === "function") {
const before = process.memoryUsage();
global.gc();
const after = process.memoryUsage();
const freed = ((before.heapUsed - after.heapUsed) / 1024 / 1024).toFixed(0);
console.log(`[gc] Post-build GC freed ${freed} MB (heap: ${(after.heapUsed / 1024 / 1024).toFixed(0)} MB)`);
}
// WebSub hub notification — skip on incremental rebuilds
if (incremental) return;
const hubUrl = "https://websubhub.com/hub";