Detecting Memory Leaks in a Node.js/Express.js Application

I've been dealing with memory problems in my Express.js web app lately. It keeps crashing with the following error:

FATAL ERROR: CALL_AND_RETRY_LAST Allocation failed - JavaScript heap
out of memory

Initially, when I launch the service, the memory usage is around 170Mb (according to RES memory on htop). However, as I send requests to it, the memory consumption continues to grow. I've been using memwatch to track what seems like a memory leak, and a memwatch.HeapDiff() shows something like this:

{ before: { nodes: 2093729, size_bytes: 197165296, size: '188.03 mb' },
  after: { nodes: 2491264, size_bytes: 232097040, size: '221.34 mb' },
  ...

It indicates that the app is utilizing 221.34mb for the heap; however, htop reports about 2GB of memory usage when it crashes.

This brings me to the question: if my assumptions are correct, what could be consuming non-heap memory that is still shown as RES memory by htop?

javascriptlinuxexpressmemory-leaksnode-memwatch

Answer №1

I encountered a similar situation where the reported used memory was significantly smaller than what htop showed.

After investigating, we discovered that it was a small JavaScript memory leak causing the issue, which was resolved after fixing it.

If you're interested in learning how I diagnosed and fixed the memory leak, check out the detailed post I wrote about it here.

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