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Unix module, binding to getrusage() #8378

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vicuna opened this Issue Nov 21, 2003 · 1 comment

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commented Nov 21, 2003

Original bug ID: 1937
Reporter: administrator
Status: closed (set by @damiendoligez on 2012-01-27T18:50:29Z)
Resolution: fixed
Priority: normal
Severity: feature
Fixed in version: 3.09.2
Category: ~DO NOT USE (was: OCaml general)

Bug description

Full_Name: Daniel Bünzli
Version: 3.07+2
OS: MacOS X 10.3.1
Submission from: 45.45.203.62.dial.bluewin.ch (62.203.45.45)

The resolution of Unix.times() is too low. Subtracting figures returned by two
subsequent calls to the function one often gets 0.0 (even if some code was
executed meanwhile).

(Unix.times()).Unix.tms_utime -. (Unix.times()).Unix.tms_utime;;

  • : float = 0.

Unix.gettimeofday(), has a good resolution however it doesn't enable one to make
the difference between user and system time.

(Unix.gettimeofday()) -. (Unix.gettimeofday());;

  • : float = 2.02655792236328125e-06

A binding in the Unix module to the getrusage [1] function would give user and
system times with the accuracy of gettimeofday, that is possibly down to
microseconds (actual resolution is system dependent).

Thanks for considering,

Daniel

[1] http://www.opengroup.org/onlinepubs/007904975/functions/getrusage.html
http://www.opengroup.org/onlinepubs/007904975/basedefs/sys/resource.h.html

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commented Jan 27, 2012

Comment author: @damiendoligez

Fixed in 3.09.2 and in trunk (commit 7382): Unix.times now calls getrusage if available.

@vicuna vicuna closed this Jan 27, 2012

@vicuna vicuna added the feature-wish label Mar 19, 2019

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