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From "Philip M. Gollucci" <>
Subject BSD::Resource and getrusage(2)
Date Fri, 07 Jul 2006 08:01:57 GMT
Hi, I'm trying do determine the units for one of the fields returned by getrusage(2)

man page on 6.0-RELEASE-p5 says this:
2 maxrss maximum shared memory or current resident set
3 ixrss integral shared memory

an ``integral'' value indicating the amount of memory used
by the text segment that was also shared among other pro-
cesses. This value is expressed in units of

kilobytes * ticks-of-execution.

Ticks are statistics clock ticks.
The statistics clock has a frequency of sysconf(_SC_CLK_TCK)

which to me implies thats in kilobytes, but to the contrary, we have the following

CPAN rt:
I'll paste the import part of this here so you don't have to follow the link

>ApacheSizeLimit on bsd systems uses BSD::Resource to get the memory and
>shared-pages size.
>	sub bsd_size_check {
>		return (&BSD::Resource::getrusage())[2,3];
>	}

I also have a local test based on the recent Apache::SizeLimit work from Dave Rolsky

maxrss > ixrss
(Apache-Test output snipped)
#     '14124' maxrss
#         >
#     '52080' ixrss

I tried looking in src/sys/kern/kern_resource.c but I didn't find anything that told me the

My inkling is the documentation is WRONG.
Philip M. Gollucci ( 323.219.4708
Consultant /
Senior Software Engineer - TicketMaster -
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