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Initial version
This commit is contained in:
Zoltan Herpai
Steve Schnepp
parent
57f2b00f13
commit
b809ad3eab
189
plugins/other/xen_cpu_v2
Executable file
189
plugins/other/xen_cpu_v2
Executable file
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#!/usr/bin/perl -w
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#
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# xen_cpu_v2.pl 1.00
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# Script to minitor the CPU usage of Xen domains
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# Zoltan HERPAI (c) 2009, wigyori@uid0.hu
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#
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# Based loosely on Adam Crews' xen_cpu script
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#
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# This script tries to measure the CPU usage of the Xen guests
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# accurately.
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# The problem with the current monitoring script is that these
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# scripts use the CPU output of xentop or xm list, which might be
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# inaccurate due to the resources used up at the time of the query by
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# the xm or xentop command.
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#
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# This script stores the previous value of the CPU sec value of the given
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# guests in a tempfile, then does some simple calculations to get the real
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# CPU usage percentage of the guests.
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#
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#%# family=auto
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#%# capabilities=autoconf
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use strict;
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use POSIX;
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# Define where to find xm tools
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my $XM = '/usr/sbin/xm';
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my $XMTOP = '/usr/sbin/xentop';
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my $curtime = time();
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my $basename = `/usr/bin/basename $0`; chop ($basename);
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my $TEMPFILE = "/tmp/$basename";
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my $debug = 0;
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##############
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# You should not need to edit anything below here
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#
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$ENV{PATH} = '/bin:/usr/bin:/usr/sbin';
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my $arg;
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if ( defined($ARGV[0]) )
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{
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if ( $ARGV[0] eq 'config' )
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{
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$arg = 'config';
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}
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if ( $ARGV[0] eq 'autoconf' )
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{
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$arg = 'autoconf';
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}
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if ( $arg eq 'autoconf')
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{
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if ( -e $XM && -e $XMTOP )
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{
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print "yes\n";
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exit 0;
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}
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else
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{
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print "no ($XM and/or $XMTOP not found\n";
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exit 1;
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}
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}
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if ( $arg eq 'config' )
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{
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my %cnf;
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%cnf = (
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'graph_title' => 'Xen Domain CPU Usage v2',
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'graph_args' => '--base 1000 -l 0 --upper-limit 100 --rigid',
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'graph_vlabel' => 'Percent (%)',
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'graph_category' => 'xen',
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'graph_info' => 'Display the % of CPU Usage for each domain',
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);
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my @domains = `$XM list`;
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my $cnt = 0;
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shift(@domains); # we dont need the header line
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foreach my $domain ( @domains )
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{
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my ($dom,undef) = split(/\s/, $domain, 2);
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$dom =~ s/[-.]/_/g;
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$cnf{ "$dom" . '.label' } = "$dom";
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$cnf{ "$dom" . '.draw' } = 'STACK';
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$cnf{ "$dom" . '.min' } = '0';
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$cnf{ "$dom" . '.max' } = '100';
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$cnf{ "$dom" . '.info' } = '% CPU used for ' . "$dom";
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# $cnf{ "$dom" . '.draw' } = 'AREA';
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if ( $cnt == 0 )
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{
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$cnf{ "$dom" . '.draw' } = 'AREA';
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}
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$cnt++;
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}
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foreach my $key (sort(keys(%cnf)))
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{
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print "$key $cnf{$key}\n";
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}
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exit 0;
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}
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}
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my @xmlist = `$XM list`;
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shift (@xmlist);
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my %dom; my $name; my $oldtime;
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# Read old data
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if ( -e $TEMPFILE )
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{
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open(FH, "<", $TEMPFILE) or die $!;
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$oldtime = <FH>;
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if ( $debug )
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{
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print "Oldtime: $oldtime\n";
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}
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while (<FH>)
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{
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# Get the guest name and its CPU usage, and store it in $dom
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$_ =~ /(\S+)\s+\S+\s+\S+\s+\d+\s+\S+\s+(\S+)/;
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$dom{$1}->{'oldtime'} = $2;
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}
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close FH;
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}
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my $diff; my $cpusum = 0;
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foreach my $domain ( @xmlist )
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{
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# Get the domains' name and current CPU usage, store it in $dom
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$domain =~ /(\S+)\s+\S+\s+\S+\s+\d+\s+\S+\s+(\S+)/;
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$dom{$1}->{'newtime'} = $2;
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$diff = $dom{$1}->{'newtime'} - $dom{$1}->{'oldtime'};
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$diff = sprintf("%.2f", $diff);
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# Calc the diff between old and new cputime, or reset the counter
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if ( $diff < 0 )
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{
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$diff = $dom{$1}->{'newtime'};
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}
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$dom{$1}->{'diff'} = $diff;
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# Calc a sum CPU usage
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$cpusum = $cpusum + $diff;
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}
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my $numcpus = `$XM info |grep nr_cpus |cut -d \: -f 2`;
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my $timediff = $curtime - $oldtime;
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my $tcpuavail = $numcpus * $timediff;
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if ( $debug )
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{
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print "UsedCPUtime sum: $cpusum\n";
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print "CPUs: $numcpus\n";
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print "Timediff: $timediff\n";
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print "Total CPU time available: $tcpuavail\n";
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}
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my $key; my $value;
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while (($key, $value) = each %dom)
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{
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# Calc a percentage based on the used CPU time sum
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my $tmp = 0;
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$tmp = ( $dom{$key}->{'diff'} / $cpusum ) * 100;
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$dom{$key}->{'pc_time'} = sprintf("%.2f", $tmp);
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# Calc a percentage based on the _total_ available CPU time
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$tmp = 0;
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$tmp = ( $dom{$key}->{'diff'} / $tcpuavail ) * 100;
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$dom{$key}->{'pc_tcpu'} = sprintf("%.2f", $tmp);
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if ( $debug )
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{
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print "$key newtime: ".$dom{$key}->{'newtime'}.", oldtime: ".$dom{$key}->{'oldtime'}.", diff: ".$dom{$key}->{'diff'}.", pc_bytime ".$dom{$key}->{'pc_time'}.", pc_bytcpu ".$dom{$key}->{'pc_tcpu'}."\n";
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}
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print "$key.value ".$dom{$key}->{'pc_tcpu'}."\n";
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}
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# We'll need to log out the current "xm list" output, and the current time also.
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open(FH, ">", $TEMPFILE) or die $!;
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print FH $curtime."\n";
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print FH @xmlist;
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close FH;
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