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contrib-munin/plugins/system/pagefaults_by_process

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#!/usr/bin/perl
#
# Copyright 2012 Chris Wilson
# Copyright 2006 Holger Levsen
#
# This plugin monitors ALL processes on a system. No exceptions. It can
# produce very big graphs! But if you want to know which processes are
# killing your system by page faulting, without knowing what to monitor
# in advance, this can help; or in addition to one of the more specific
# plugins to monitor just Apache or MySQL, for example.
#
# Each counter is a DERIVE (difference since the last counter reading)
# of the number of major page faults, usually 4k each, read in by a
# process. Memory mapped files probably contribute to this. The process
# cannot continue until the page fault is served, so this is a
# high-priority read that usually indicates memory starvation.
# Processes with no page faults at all are ignored. Processes
# that die may not appear on the graph, and anyway their last chunk of
# CPU usage before they died is lost. You could modify this plugin to
# read SAR/psacct records if you care about that.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; version 2 dated June,
# 1991.
#scriptname=`basename $0`
#vsname=`echo $scriptname | perl -ne '/^vserver_proc_VM_(.*)/ and print $1'`
#if [ "$1" = "suggest" ]; then
# ls -1 /etc/vservers
# exit 0
#elif [ -z "$vsname" ]; then
# echo "Must be used with a vserver name; try '$0 suggest'" >&2
# exit 2
#fi
use strict;
use warnings;
my $cmd = "ps -eo maj_flt,comm h";
open PS, "$cmd|" or die "Failed to run ps command: $cmd: $!";
# my $header_line = <PS>;
my %total_by_process;
while (<PS>)
{
my @fields = split;
my $value = $fields[0];
my $process = $fields[1];
# remove any / and everything after it from the process name,
# e.g. kworker/0:2 -> kworker
$process =~ s|/.*||;
# remove any . at the end of the name (why does this appear?)
# $process =~ s|\.$||;
# change any symbol that's not allowed in a munin variable name to _
$process =~ tr|a-zA-Z0-9|_|c;
$total_by_process{$process} += $value;
}
foreach my $process (keys %total_by_process)
{
# remove all processes with 0 faults
if (not $total_by_process{$process})
{
delete $total_by_process{$process};
}
}
close(PS);
if (@ARGV and $ARGV[0] eq "config")
{
print <<END;
graph_title Page faults by Process
graph_args --base 1000
graph_vlabel major page faults
graph_category processes
graph_info Shows number of major page faults caused by each process name
END
my $stack = 0;
sub draw() { return $stack++ ? "STACK" : "AREA" }
print map
{
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"$_.label $_\n" .
"$_.min 0\n" .
"$_.type DERIVE\n" .
"$_.draw " . draw() . "\n"
} sort keys %total_by_process;
}
else
{
print map
{
"$_.value $total_by_process{$_}\n"
} sort keys %total_by_process;
}
exit(0);