Munin contributed plugins

#!/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 where your CPU time

# is going without knowing what to monitor in advance, this can help;

# or in addition to one of the more specific CPU plugins to monitor

# just Apache or MySQL, for example.

#

# It's not obvious what the graph heights actually mean, even to me.

# Each counter is a DERIVE (difference since the last counter reading)

# of the CPU time usage (in seconds) accounted to each process, summed

# by the process name, so all Apache and all MySQL processes are grouped

# together. Processes with no CPU usage 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 time,comm h";

open PS, "$cmd|" or die "Failed to run ps command: $cmd: $!";

# my $header_line = <PS>;

my %total_cpu_by_process;

while (<PS>)

{

	my @fields = split;

	my $cputime = $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;

	my @times = split /:/, $cputime;

	my @days = split /-/, $times[0];

	if ($days[1]) {

		$cputime = ((($days[0] * 24) + $days[1]) * 60 + $times[1]) * 60 + $times[2];

	} else {

		$cputime = (($times[0] * 60) + $times[1]) * 60 + $times[2];

	}

	$total_cpu_by_process{$process} += $cputime;

}

foreach my $process (keys %total_cpu_by_process)

{

	# remove all processes with 0 cpu time

	if (not $total_cpu_by_process{$process})

	{

		delete $total_cpu_by_process{$process};

	}

}

close(PS);

if (@ARGV and $ARGV[0] eq "config")

{

	print <<END;

graph_title CPU time by Process

graph_args --base 1000

graph_vlabel seconds

graph_category system

graph_info Shows CPU time used by each process name

END

	my $stack = 0;

	sub draw() { return $stack++ ? "STACK" : "AREA" }

	print map

	{

		"$_.label $_\n" .

		"$_.min 0\n" .

		"$_.type DERIVE\n" .

		"$_.draw " . draw() . "\n"

	} sort keys %total_cpu_by_process;

}

else

{

	print map

	{

		"$_.value $total_cpu_by_process{$_}\n"

	} sort keys %total_cpu_by_process;

}

exit(0);