Re: timing parallel programs

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Article #901

#901

From: Jim Reid
Date: Thu, 15 Feb 1990 14:20

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In article <LUIS.90Feb15104438@molly.octopus.tds.kth.se> luis@octopus.tds.kth.se (Luis Barriga) writes:
>2) I have read about a system call "getrusage" that gives info about
>resource utilization: system, user time consumed, and other stuff. Is
>there any problem using it?

No, but the numbers it gives may not be reproducible. Paging statistics
may be influenced by the amount of free memory when the process is run.
The system time will probably include time spent processing interrupts
*on behalf of other processes*. Likewise the I/O statistics may include
counts for I/O for another process (i.e. starting the next disk transfer
request in the queue after servicing an interrupt from the controller).
If you plan on using getrusage for real, run your program several times
to average out these potential inconsistencies.

		Jim

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References: <1324@csisles.Bristol.AC.UK> <1803@baird.cs.strath.ac.uk> <LUIS.90Feb15104438@molly.octopus.tds.kth.se>

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!uunet!mcsun!ukc!strath-cs!jim
From: jim@cs.strath.ac.uk (Jim Reid)
Newsgroups: comp.sys.sequent
Subject: Re: timing parallel programs
Message-ID: <1882@baird.cs.strath.ac.uk>
Date: 15 Feb 90 14:20:34 GMT
References: <1324@csisles.Bristol.AC.UK> <1803@baird.cs.strath.ac.uk> <LUIS.90Feb15104438@molly.octopus.tds.kth.se>
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