[Patches] [ python-Patches-645894 ] better timer resolution for profile.py

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Patches item #645894, was opened at 2002-11-30 01:17
Message generated for change (Comment added) made by loewis
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Category: Library (Lib)
Group: None
>Status: Closed
>Resolution: Accepted
Priority: 5
Submitted By: John-Mark Gurney (jmg)
Assigned to: Nobody/Anonymous (nobody)
Summary: better timer resolution for profile.py

Initial Comment:
On some platforms time.clock() does not return a high
resolution counter.  On FreeBSD, it's resolution is
only 1/128th of a second.  In order to get microsecond
accuracy, the getrusage syscall from resource needs to
be used.

Attached is a patch that uses getrusage from the
resource library in preference of os.clock.

This was done on behalf of Vernier Networks, Inc.

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>Comment By: Martin v. Löwis (loewis)
Date: 2005-03-03 12:40

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I believe getrusage is always the better choice, as clock()
wraps around after 36 minutes on a POSIX system. Committed as

profile.py 1.62
NEWS 1.1258


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Comment By: Reinhold Birkenfeld (birkenfeld)
Date: 2005-02-23 19:28

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If this leads to better resolution on FreeBSD, it seems like
a good idea. However, if you don't know about other OS, what
about restricting the patch to FreeBSD?

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Comment By: Brett Cannon (bcannon)
Date: 2003-07-06 22:28

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Is there any possibility that using this could lead to worse timing 
under another OS?

And I assume this is still an issue under FreeBSD 5.

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