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contrib-munin/plugins/system/cpu_by_process
2012-11-01 10:29:10 +00:00

107 lines
2.8 KiB
Perl
Executable File

#!/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;
$cputime = (($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[1] 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);