CODEWITHSUNDEEP
javascriptnode.jsdebuggingprofiling
MaiaVictor
MaiaVictor

Reputation: 52957

Interpreting node.js profile output?

test.js

function test(){
    for(var i=0; i<2000000000; ++i);
};
test();

Commands used to profile it:

node --prof test.js
nprof

Output:

line 249: unknown code state: undefined
line 252: unknown code state: undefined
line 253: unknown code state: undefined
line 256: unknown code state: undefined
line 258: unknown code state: undefined
line 259: unknown code state: undefined
line 260: unknown code state: undefined
line 261: unknown code state: undefined
line 262: unknown code state: undefined
line 263: unknown code state: undefined
line 264: unknown code state: undefined
line 265: unknown code state: undefined
line 266: unknown code state: undefined
(This repeats around 1000 times. I'm removing it from this paste...)

 [Unknown]:
   ticks  total  nonlib   name
     34   79.1%

 [Shared libraries]:
   ticks  total  nonlib   name
      8   18.6%    0.0%  /usr/local/bin/node
      1    2.3%    0.0%  /usr/lib/system/libsystem_kernel.dylib

 [JavaScript]:
   ticks  total  nonlib   name

 [C++]:
   ticks  total  nonlib   name

 [GC]:
   ticks  total  nonlib   name
      0    0.0%

 [Bottom up (heavy) profile]:
  Note: percentage shows a share of a particular caller in the total
  amount of its parent calls.
  Callers occupying less than 2.0% are not shown.

   ticks parent  name
      8   18.6%  /usr/local/bin/node

      1    2.3%  /usr/lib/system/libsystem_kernel.dylib

I was expecting it to show the "test" function on the [JavaScript] part. Why it's not there?

Upvotes: 2

Views: 1672

Answers (1)

Andrey Sidorov
Andrey Sidorov

Reputation: 25456

nprof uses tick processor for v8.log format different from what you have

I'm having the same issue in node-tick ( which is currently compatible with node 0.8.2 afaik ).

Possible solutions:

or you can try to rebuild nprof with scripts from your node version:

  git clone https://github.com/bnoordhuis/node-profile
  git clone https://github.com/joyent/node
  cd node
  git checkout v0.8.7-release # can't see tag for 0.8.2
  cp deps/v8/tools/*.js ../node-profile/tools/v8
  cd ../node-profile
  sh tools/build-nprof

Upvotes: 2

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