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