#!@@PERL@@
# -*- perl -*-

=head1 NAME

cpu - Plugin to monitor CPU usage on AIX (4.3.3 and 5.x)

=head1 CONFIGURATION

No configuration

=head1 NOTES

=head2 DESCRIPTION

This will monitor the cpu usage on your server.  It measures the amout
of time spent on user requests, system requests, in iowait, and
finally in idle.  It uses /usr/bin/iostat, which is usually installed.

=head2 RESTRICTIONS

None known of.  Should be safe to run this under any user -- this is
not restricted to root.

=head1 AUTHOR

Developed 05/28/2003 by Mike Discenza <mike.discenza@dillards.com>

=head1 LICENSE

GPLv2

=head1 MAGIC MARKERS

 #%# family=contrib
 #%# capabilities=autoconf

=cut

use strict;
use POSIX;

my($arg) = shift;

if($arg eq 'autoconf')
  {
    if(-e '/usr/bin/iostat' && -X '/usr/bin/iostat')
      {
        print "yes\n";
        exit 0;
      }
    else
      {
        print "no\n";
        exit 0;
      }
  }


if($arg eq 'config')
  {
    my($percent) = 100;
    my($warn) = $percent*30/100;
    my($critical) = $percent*50/100;
    my($usrwarn) = $percent*80/100;
    print "graph_title CPU usage\n";
    print "graph_order idle iowait system user\n";
    print "graph_args -r --lower-limit 0 --upper-limit $percent \n";
    print "graph_vlabel %\n";
    print "graph_scale no\n";
    print "graph_category system\n";
    print "system.label system\n";
    print "system.type GAUGE\n";
    print "system.max 5000\n";
    print "system.type GAUGE\n";
    print "system.warning $warn\n";
    print "system.critical $critical\n";
    print "user.label user\n";
    print "user.type GAUGE\n";
    print "user.max 5000\n";
    print "user.warning $usrwarn\n";
    print "user.type GAUGE\n";
    print "iowait.label iowait\n";
    print "iowait.type STACK\n";
    print "iowait.max 5000\n";
    print "iowait.type GAUGE\n";
    print "idle.label idle\n";
    print "idle.max 5000\n";
    print "idle.type GAUGE\n";
    exit 0;
  }

my($user,$sys,$idle,$iowait) = getMeasurements();
my($uptime) = getUptime();

findTotalTime($user,$sys,$idle,$iowait,$uptime);

sub findTotalTime
{
  my($user,$sys,$idle,$iowait,$uptime) = @_;
  my($userTime) = ceil($user);
  my($sysTime) = ceil($sys);
  my($idleTime) = ceil($idle);
  my($iowaitTime) = ceil($iowait);

  print "user.value $userTime\nsystem.value $sysTime\nidle.value $idleTime\niowait.value $iowaitTime\n";
}

sub getMaxPercent
{
  my($numCPUs) = `/usr/sbin/lscfg|grep proc|wc -l`;
  my($percent) = $numCPUs * 100;
  return $percent;
}

sub getUptime
{
  my($uptimeSTR) = `/usr/bin/uptime`;
  my(@upArray) = split(/ +/,$uptimeSTR);
  my($upItem,$upDays,$upHours,$upMinutes,@timeArray,$upDays);
  my($itemCount) = 0;
  foreach $upItem (@upArray)
    {
      if(lc(substr($upItem,0,3)) eq 'day')
        {$upDays =  $upArray[$itemCount - 1];}
      if(index($upItem,":") != -1 && length($upHours) == 0 && length($upMinutes) == 0 && $itemCount > 1)
        {
          @timeArray = split(/:/,$upItem);
          ($upHours,$upMinutes) = @timeArray;
        }
      $itemCount++;
    }
  my($upMinutes) = (((($upDays * 24) + $upHours) * 60) + $upMinutes) * 60;
  return $upMinutes;
}

sub getMeasurements
{
  my($percents) = `/usr/bin/iostat -t 1 2|tail +3`;
  my(@items) = split(/ +/,$percents);
  my($user) = $items[3];
  my($sys) = $items[4];
  my($idle)= $items[5];
  my($iowait)= $items[6];
  return ($user,$sys,$idle,$iowait);
}
