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perf_hooks: add idleTime and event loop util #34938

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perf_hooks: add idleTime and event loop util #34938

wants to merge 1 commit into from

Commits on Aug 27, 2020

  1. perf_hooks: add idleTime and event loop util 

    Use uv_metrics_idle_time() to return a high resolution millisecond timer
of the amount of time the event loop has been idle since it was
initialized.

Include performance.eventLoopUtilization() API to handle the math of
calculating the idle and active times. This has been added to prevent
accidental miscalculations of the event loop utilization. Such as not
taking into consideration offsetting nodeTiming.loopStart or timing
differences when being called from a Worker thread.
    @trevnorris
    trevnorris committed Aug 27, 2020
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