Date: Mon, 6 Jun 2022 14:49:37 +0200 From: Daniel Ebdrup Jensen <debdrup@FreeBSD.org> To: freebsd-hackers@freebsd.org Subject: Re: What can I learn about data that is staying paged out? (There is a more specific poudriere bulk related context given.) Message-ID: <20220606124937.exjit7znetcx6t6z@geroi.local> In-Reply-To: <50163894-DCEB-4033-B555-698523E4D100@yahoo.com> References: <A9C9AC24-62EC-43C1-B713-F2012CD1FD5B@yahoo.com> <27DD20B8-E19B-444B-BAE7-A09CD5390D2F@crossfamilyweb.com> <50163894-DCEB-4033-B555-698523E4D100@yahoo.com>
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On Sun, Jun 05, 2022 at 03:55:21PM -0700, Mark Millard wrote:
>Thanks for the idea. Know how I could find an approximation
>to the amount of paged out buffer cache to see about how much
>of the ~300 MiBytes it might explain?
>
>Mark
>
>===
>Mark Millard
>marklmi at yahoo.com
>
>
Hi folks,
I believe what you're looking for is:
vmstat -o | awk '$7 == "sw" { print $0 }'
The definition of the 7th column is escaping me right now; I'm
pretty sure I've seen it in a manual page somewhere, but can't for
the life of me remember it - so if anyone knows, do tell and I'll
figure out a way to get it added to vmstat. ;)
If a lot of lines in vmstat -o are blank, it's usually a good idea
to have a look at `pstat -f` because it'll either be shared memory
objects, sockets, pipes, or things like that.
There's also vmstat -m or vmstat -z which can be useful in breaking
down types of VM objects by allocator.
I've also taken the liberty of including `zones.pl` which has been
floating around FreeBSD circles for ages, and which uses the vmstat
-z flag mentioned above plus a bit of perl to sum everything up
nicely.
This is just what I've picked up over the course of sysadmining,
I'm by no means a VM expert - as evidenced by the fact that I
didn't know about sytat -swap, despite using systat regularly, and
wishing it had a `systat -sensors` page which detailed the
temperature values that can be found via acpi(4), coretemp(4) and
occationally others, as well as fan-speed as reported by
acpi_ibm(4) and others of its kind in /boot/kernel/acpi_*.
Yours,
Daniel Ebdrup Jensen
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#!/usr/bin/env perl
open STDIN, "vmstat -z |" or die "Failed to run vmstat program";
open STDOUT, "| sort -n @ARGV -k 2" or die "Failed to pipe through sort";
$fmt="%-30s %8.3f %8.3f %8.3f %6.1f%%\n";
while (<STDIN>) {
($n, $s, undef, $u, $c) = split /[:,] */;
next unless $s > 0;
$n =~ s/ /_/g;
$s /= 1024 * 1024;
$u *= $s;
$c *= $s;
$t = $u + $c;
next unless $t > 0;
printf $fmt, $n, $t, $u, $c, 100 * $c / $t;
$cache += $c;
$used += $u;
$total += $t;
}
printf $fmt, TOTAL, $total, $used, $cache, 100 * $cached / $total;
close STDOUT;
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