Date: Thu, 02 Mar 2006 23:50:29 +0000 From: Nick Barnes <Nick.Barnes@pobox.com> To: Nik Clayton <nik@freebsd.org> Cc: stable@freebsd.org Subject: Re: Failing to understand getrusage() Message-ID: <80813.1141343429@thrush.ravenbrook.com> In-Reply-To: <44077091.3060604@freebsd.org> from Nik Clayton <nik@freebsd.org> of "Thu, 02 Mar 2006 22:24:17 %2B0000"
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At 2006-03-02 22:24:17+0000, Nik Clayton writes:
> I'm failing to understand how getrusage() works, which is a bit perplexing,
> because it doesn't seem like it would be terribly complicated.
ru_maxrss is the maximum resident set size, not the heap size.
malloc(big) doesn't grow the resident set. Touching the memory you
have allocated will grow the resident set. Try this:
getrusage(RUSAGE_SELF, &ru);
printf("%lu\n", ru.ru_maxrss);
p = malloc(SIZE);
assert(p)
getrusage(RUSAGE_SELF, &ru);
printf("%lu\n", ru.ru_maxrss);
for (i=0; i<SIZE; ++i) {
p[i] = 0;
}
getrusage(RUSAGE_SELF, &ru);
printf("%lu\n", ru.ru_maxrss);
Nick B
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