Benchmark unref timers worst case

gistfile1.md

Benchmark source code

var timers = require('timers');

var N = 100000;

var i = 0;
while (i < N) {
    var  someObject = { _onTimeout: function () { } };
    timers.enroll(someObject, i);
    timers._unrefActive(someObject);
    ++i;
}

setTimeout(function() {}, N);

Heap Linux v0.12

ticks parent  name
  71657   93.2%  syscall

   1610    2.1%  LazyCompile: *Heap._swap _heap.js:181:32
   1475   91.6%    LazyCompile: *Heap._down _heap.js:278:32
   1306   88.5%      LazyCompile: *Heap._down _heap.js:278:32
   1124   86.1%        LazyCompile: *Heap._down _heap.js:278:32
    946   84.2%          LazyCompile: *Heap._down _heap.js:278:32
    793   83.8%            LazyCompile: *Heap._down _heap.js:278:32
    153   16.2%            LazyCompile: *Heap.remove _heap.js:88:33
    178   15.8%          LazyCompile: *Heap.remove _heap.js:88:33
    178  100.0%            LazyCompile: *Heap.pop _heap.js:79:30
    182   13.9%        LazyCompile: *Heap.remove _heap.js:88:33
    182  100.0%          LazyCompile: *Heap.pop _heap.js:79:30
    182  100.0%            LazyCompile: ~<anonymous> native v8natives.js:1:1
    169   11.5%      LazyCompile: *Heap.remove _heap.js:88:33
    169  100.0%        LazyCompile: *Heap.pop _heap.js:79:30
    169  100.0%          LazyCompile: ~<anonymous> native v8natives.js:1:1
    134    8.3%    LazyCompile: *Heap.remove _heap.js:88:33
    134  100.0%      LazyCompile: *Heap.pop _heap.js:79:30
    134  100.0%        LazyCompile: ~<anonymous> native v8natives.js:1:1

Unordered list Linux v0.12

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
  41831   52.2%  syscall

  19713   24.6%  LazyCompile: unrefTimeout timers.js:470:22

   9679   12.1%  Stub: LoadFieldStub
   9679  100.0%    LazyCompile: unrefTimeout timers.js:470:22

   4590    5.7%  Stub: CompareICStub
   4590  100.0%    LazyCompile: unrefTimeout timers.js:470:22