Date: Tue, 31 Oct 2000 10:47:40 -0800 (PST) From: Matt Dillon <dillon@earth.backplane.com> To: Les Biffle <les@ns3.safety.net> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: Runtime memory footprint Message-ID: <200010311847.e9VIlev20173@earth.backplane.com> References: <200010311817.LAA90886@ns3.safety.net>
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:What determines the runtime memory footprint of a process? I have small
:daemons that occupy 25K on disk, don't malloc anything to speak of, but
:are 440K to 1024K in memory, according to top and ps. For that matter,
:just about nothing in my "ps" display is under 400K. The daemons are
:dynamically-linked. Is there anything I can do to reduce the memory
:footprint?
:
:Thanks and best regards,
:
:-Les
:
:--
:Les Biffle Community Service... Just Say NO!
Most of this is from shared libraries. The processes aren't actually
eating that much memory.
fire:/home/dillon> fgrep blah
(leave sitting around)
fire:/home/dillon> ps axl | egrep 'RSS|fgrep'
UID PID PPID CPU PRI NI VSZ RSS WCHAN STAT TT TIME COMMAND
101 17341 16524 0 3 0 1036 496 ttyin S+ p1 0:00.00 fgrep blah
^^^
496K run size
vmstat 1
before first fgrep is run
0 0 0 110532 65772 9 0 0 0 6 0 0 0 258 178 53 0 1 99
1 0 0 110532 65772 9 0 0 0 6 0 0 0 231 100 35 1 1 98
after first fgrep is run
0 0 0 110964 65636 53 0 0 0 7 0 0 0 313 732 129 2 0 98
0 0 0 110964 65636 9 0 0 0 6 0 0 0 284 205 53 0 0 100
after second fgrep is run
0 0 0 111312 65504 52 0 0 0 7 0 0 0 237 282 64 1 1 98
0 0 0 111312 65504 9 0 0 0 6 0 0 0 435 529 108 1 2 98
Difference: around 132K less free memory for each instance of fgrep
that is run.
So fgrep, with an RSS of 496K, actually only eats up around 132K of
unsharable ram.
-Matt
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