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Monotonic and wall clock time in the Go time package(victoriametrics.com)
21 points by valyala 3 days ago | 6 comments
  • jsw2 days ago

    For simple high-frequency time deltas, I've found this function wins on the perf front:

      //go:linkname nanotime runtime.nanotime
      func nanotime() int64
  • deepsun2 days ago

    And not a word about fasttime.UnixTimestamp()? I thought that's the recommended way, it literally says:

        // It is faster than time.Now().Unix()
    
    https://pkg.go.dev/github.com/VictoriaMetrics/VictoriaMetric...
    • kiitos2 days ago |parent

      This package spawns a goroutine that updates an atomic value every second based on a time.Time from a time.Ticker, and its functions load that atomic value. This is not really comparable to anything in package time in any useful way...

    • noselasd2 days ago |parent

      It's a bit specialized though, it's just a cached value of a time.NewTicker updating once per second and the article talks about this in the "Schedule Based on Monotonic Time" section

    • deepsun2 days ago |parent

      Wait, I see it's been removed actually [1]. Why, isn't it faster anymore?

      [1] https://github.com/VictoriaMetrics/VictoriaMetrics/commit/c2...

      • noselasd2 days ago |parent

        It's not removed, it's moved to a separate file as it's problematic to use in tests, commit 06c2631 talks about why.