Question

test.js

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

用于分析它的命令：

node --prof test.js
nprof

输出：

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

我希望它能在[JavaScript]部分显示“测试”功能。为什么不存在？

Answer 1

nprof使用tick处理程序获取与您拥有的不同的v8.log格式

我在issue中拥有相同的node-tick（目前与节点0.8.2 afylek兼容）。

可能的解决方案：

尝试node-tick
尝试以前版本的nprof（npm install profiler@1.2.0）

或者您可以尝试使用节点版本的脚本重建nprof：

  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

解释node.js配置文件输出？

1 个答案: