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5589 :: Which is the fastest way to use a timer

• kcvinu (orginal) [2019-11-25T14:03:17+01:00] view original

  Hi all, I need to measure the time difference of mouse down event and mouse up event. So I want to start a timer in the mouse down event and then in the mouse up event, i want to stop the timer and get the time difference. And i want the time difference in milliseconds or micro seconds. I cant find any timers on nim manual. But i found times module. Some on IRC chat suggest me to use "now()" on both events and get the difference. But what is the datatype of "now1() - now2()" ? Is that fast enough ?

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• pmags (orginal) [2019-11-25T14:21:31+01:00] view original

  Perhaps std/monotimes (https://nim-lang.org/docs/monotimes.html) might work for you.

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• kcvinu (orginal) [2019-11-25T14:24:19+01:00] view original

  @pmags, Thanks for the reply. Let me check. :)

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• Stefan_Salewski (orginal) [2019-11-25T14:31:54+01:00] view original

  I cant find any timers on nim manual. But i found times module.

  Why would you expect timers in the Nim manual? Nim is not a kind of virtual basic which may integrate all the user stuff into the language.

  And when you have already times module, you may inspect its functions:

  https://nim-lang.org/docs/times.html#getTime

  It is specified with ns resolution, and is often used for benchmark tests. Of course you use it with deltas, like t0 = getTime(), ... , echo "Elapsed:", getTime - t0.

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• kcvinu (orginal) [2019-11-25T14:34:28+01:00] view original

  AFAIK, The "-" operator returns a Duration type when we use "x = a-b", where both a and b are monotimes. Then Can i use "x.seconds" or "x.nanosecond" ?

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• kcvinu (orginal) [2019-11-25T14:37:15+01:00] view original

  Well, this code return error https://play.nim-lang.org/

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• kcvinu (orginal) [2019-11-25T14:42:34+01:00] view original

  Couldn't render post #34737.

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• Stefan_Salewski (orginal) [2019-11-25T14:47:15+01:00] view original

  The fact that the time of times module is not monotonic is a bit surprising for me -- well maybe when the user sets the wall time of his box? The fact should be noted in times module. But for all benchmarks done with times.getTime() I have never seen a negative delta yet.

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• kcvinu (orginal) [2019-11-25T16:11:21+01:00] view original

  The problem is the last letter "s" in nanoseonds. Because, this is what i read from the times module .. image::https://www.dropbox.com/s/o4hr5tx7r6pvoaf/2019-11-25%2020_33_54-Nim_times.nim%20at%20master%20%C2%B7%20nim-lang_Nim.png?dl=0 It clearly shows "nanosecond". So i just tried without "s" at the end.

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