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Monotonic time and the duration in Telemetry

#telemetry
leductam

leductam

Monotonic time and the duration in Telemetry

I’ve just used a bit about the Telemetry and got some confusion about duration.

  1. Duration might be zero at an unspecified point in time
  2. Duration = n*1024 (n >= 0)

I read the statement about Erlang monotonic time, and understood about #1, but don’t understand about why 1024 in #2.
Could you please help to clarify?

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RudManusachi

RudManusachi

Seems like it’s specific to Windows:

Here’s what I found about QueryPerformanceCounter (QPC):

one QPC tick is 1024 rdtsc ticks

from Stopwatch under the hood

2
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keathley

keathley

As stated before, if you are passing durations in telemetry measurements, you use System.monotonic_time to capture the starting point and ending point and take the difference between the two. This is now a duration in “native” units. Which will be unique to your system. The convention is to use native units unless specified otherwise as described here: Telemetry Conventions.

You can convert the duration into a different unit of time like so: System.convert_time_unit(duration, :native, :millisecond).

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