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#!/usr/bin/perl
use strict;
use warnings;
use utf8;
use Getopt::Long;
# Default values.
my $t_warn = $ENV{T_WARN} // 50;
my $t_crit = $ENV{T_CRIT} // 80;
my $cpu_usage = -1;
my $decimals = $ENV{DECIMALS} // 2;
my $label = $ENV{LABEL} // "";
sub help {
print "Usage: cpu_usage [-w <warning>] [-c <critical>] [-d <decimals>]\n";
print "-w <percent>: warning threshold to become yellow\n";
print "-c <percent>: critical threshold to become red\n";
print "-d <decimals>: Use <decimals> decimals for percentage (default is $decimals) \n";
exit 0;
}
GetOptions("help|h" => \&help,
"w=i" => \$t_warn,
"c=i" => \$t_crit,
"d=i" => \$decimals,
);
# Get CPU usage.
$ENV{LC_ALL}="en_US"; # if mpstat is not run under en_US locale, things may break, so make sure it is
open (MPSTAT, 'mpstat 1 1 |') or die;
while (<MPSTAT>) {
if (/^.*\s+(\d+\.\d+)[\s\x00]?$/) {
$cpu_usage = 100 - $1; # 100% - %idle
last;
}
}
close(MPSTAT);
$cpu_usage eq -1 and die 'Can\'t find CPU information';
# Full text.
printf "%s %.${decimals}f%%\n", $label, $cpu_usage;
# Short text.
printf "%s %.${decimals}f%%\n", $label, $cpu_usage;
# Print color, if needed.
if ($cpu_usage >= $t_crit) {
print "#FF0000\n";
exit 33;
} elsif ($cpu_usage >= $t_warn) {
print "#FFFC00\n";
}
exit 0;
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