report accurate mean instead of an approximation

[Dieterbe]

No description provided.

[woodsaj]

I dont think this will work. Your sum will quickly overflow and you won't get meaning values anymore.

[woodsaj]

Actually as you are using microseconds, this will take a while to overflow, but it will still eventually overflow.

[shanson7]

A 64-bit uint has an enormous max value. Even if every microsecond of every day was counted it would take ~3.5 million years to overflow. Even if this were updated from 1000 threads all day every day, it would still not overflow before the hardware rotted :).

[Dieterbe]

FTR math.MaxUint64 is 18446744073709551615. should be plenty to track the sum for each report interval (between 10~60s)
i just saw one tweak I can do:

-		sum := atomic.LoadUint64(&l.sum)
-		atomic.StoreUint64(&l.sum, 0)
+		sum := atomic.SwapUint64(&l.sum, 0)

will rebase and merge. thanks guys

[woodsaj]

you are reseting sum to 0 on every flush, but not count.

[Dieterbe]

r.Count comes from the report which comes from the histogram snapshot. the histogram is reset when snapshot is taken