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perf_hooks: add event loop delay sampler #25378

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perf_hooks: add event loop delay sampler #25378

wants to merge 2 commits into from

Commits on Feb 7, 2019

  1. perf_hooks: implement histogram based api 

    Add a sampling-based event loop delay monitor.

```js
const { monitorEventLoopDelay } = require('perf_hooks');

const h = monitorEventLoopDelay();

h.enable();

h.disable();

console.log(h.percentiles);
console.log(h.min);
console.log(h.max);
console.log(h.mean);
console.log(h.stddev);
console.log(h.percentile(50));
```
    @jasnell
    jasnell committed Feb 7, 2019
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  2. deps: float fix for building HdrHistogram on Win x86 

    From:
mcollina/native-hdr-histogram@c63e971
    @jasnell
    jasnell committed Feb 7, 2019
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