Closed
Description
openedon Jul 2, 2021
Parent process continuously grow memory usage while executing multiple child worker processes that return large chunks of data.
I prepared sample repository to reproduce issue: https://github.com/IIIEII/jest-worker-farm-leak
It has worker that returns large array with strings.
Parent process executes it three times with pause of 10s between.
Steps:
- Run sample script in inspect mode
node --inspect --expose-gc src/parent.js - Connect with chrome inspector and record allocation timeline
It seems that problem lies here: https://github.com/facebook/jest/blob/7a64ede2163eba4ecc725f448cd92102cd8c14aa/packages/jest-worker/src/Farm.ts#L136-L138
Possible solution:
- Make change to
node_modules/jest-worker/build/Farm.jsfile:
Index: node_modules/jest-worker/build/Farm.js
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/node_modules/jest-worker/build/Farm.js b/node_modules/jest-worker/build/Farm.js
--- a/node_modules/jest-worker/build/Farm.js (date 1625231320301)
+++ b/node_modules/jest-worker/build/Farm.js (date 1625231320301)
@@ -140,10 +140,11 @@
// and other properties of the task object, such as task.request can be
// garbage collected.
- const taskOnEnd = task.onEnd;
+ let taskOnEnd = task.onEnd;
const onEnd = (error, result) => {
taskOnEnd(error, result);
+ taskOnEnd = null;
this._unlock(workerId);
- Run sample script in inspect mode
node --inspect --expose-gc src/parent.js - Connect with chrome inspector and record allocation timeline
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