Profiling nodejs with v8
node.js, profiling, v8
Solution
The log file format seems to change quite frequently, so you need to make sure that you are using the right version of v8. For instance, if the profile log was generated with node v0.10.18, you have to analyse it with the tick processor for v8 version 3.14.5. To find out which version of v8 a given version of node is built on, you can check `deps/v8/ChangeLog` in the node source distribution (node's own changelog seems to be a little unreliable in this respect).
Problem
I have a node application which i want to profile using the node profiler. So first i ran: ``` node --prof v8test.js ``` Then, I downloaded the v8 tools ``` svn checkout http://v8.googlecode.com/svn/trunk/ v8; make dependencies; make native; ``` Then tried to analyze the file created (v8.log) ``` tools/linux-tick-processor ../v8.log ``` But i get a lot of: ``` Code move event for unknown code: 0x289dd8475560 Code move event for unknown code: 0x289dd84758e0 Code move event for unknown code: 0x289dd8479280 Code move event for unknown code: 0x289dd8482980 Code move event for unknown code: 0x289dd84c2a80 line 718730: unknown code state: undefined line 718731: unknown code state: undefined line 739575: unknown code state: undefined line 739577: unknown code state: undefined ``` Can anybody help me figure out what's going on ?