Tools to analyze core dump from Node.js

Question

If I use gcore to make a code dump of a Node.js process, what are the best tools to analyze it?

Inspired by: Tool for analyzing java core dump

In my specific cas

Answer 1

On Linux and Mac you can use llnode a plugin for the lldb debugger. The project is available under the nodejs organization on github:

https://github.com/nodejs/llnode

You can install from source via github or use brew on Mac. The readme on github should help you get it installed and there's an introductory blog article here:

https://developer.ibm.com/node/2016/08/15/exploring-node-js-core-dumps-using-the-llnode-plugin-for-lldb/

The original question was about memory analysis and the v8 findjsobjects and v8 findjsinstances commands will help there by generating a basic histogram of object counts and allowing you to list the instances of each type.

There's a full article on using llnode for memory analysis here: http://www.brendangregg.com/blog/2016-07-13/llnode-nodejs-memory-leak-analysis.html