解释node.js配置文件输出

Question

test.js

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

用于对其进行配置的命令：

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

我希望它能显示[JavaScript]部分的"测试"功能。为什么它不在那里？

Answer 1

nprof使用tick处理器处理v8.log格式，与不同

我在node tick中也遇到了同样的问题（它目前与node 0.8.2 afaik兼容）。

可能的解决方案：

• 尝试节点刻度
• 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中的脚本重建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