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Munin (master)
Last change
2018-10-10
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License
GPL-2.0-only

sar_cpu

Name

cpu - Plugin to monitor CPU usage

HP-UX port from original cpu plugin, here using sar instead of Solaris’ kstat. Also note that kstat as well as Linux /proc/stat use counters (of cpu cycles?), whereas sar merely displays percentages (hopefully this comes close enough)

Configuration

Your may adapt the following parameters to your needs. The values shown here are the defaults

[sar_cpu]
    env.SYSWPCT 30     # System percentage to warn at
    env.SYSCPCT 50     # System percentage where we're critical
    env.USRWPCT 80     # User percentage to warn at
    env.scaleto100 1   # Graph in percent rather than absolute ncpu

Author

Contributed by <ralph dot grothe at itdz minus berlin dot de>

License

GPLv2

Magic Markers

#%# family=auto
#%# capabilities=autoconf
#!/usr/local/bin/bash

: << =cut

=head1 NAME

cpu - Plugin to monitor CPU usage

HP-UX port from original cpu plugin, here using sar instead of
Solaris' kstat.  Also note that kstat as well as Linux /proc/stat
use counters (of cpu cycles?), whereas sar merely displays
percentages (hopefully this comes close enough)

=head1 CONFIGURATION

Your may adapt the following parameters to your needs.
The values shown here are the defaults

 [sar_cpu]
     env.SYSWPCT 30     # System percentage to warn at
     env.SYSCPCT 50     # System percentage where we're critical
     env.USRWPCT 80     # User percentage to warn at
     env.scaleto100 1   # Graph in percent rather than absolute ncpu

=head1 AUTHOR

Contributed by <ralph dot grothe at itdz minus berlin dot de>

=head1 LICENSE

GPLv2

=head1 MAGIC MARKERS

 #%# family=auto
 #%# capabilities=autoconf

=cut

PATH=/usr/bin:/usr/sbin

if [[ $1 = autoconf ]]; then
    if uname -s|grep -qEi 'hp-?ux'; then
	echo yes
	exit 0
    else
	echo "no (This plugin is meant to be run under HP-UX)"
	exit 0
    fi
fi

: "${SYSWPCT:=30}"
: "${SYSCPCT:=50}"
: "${USRWPCT:=80}"
: "${scaleto100:=1}"

graphlimit=$percent
case $scaleto100 in (1|y*|Y*) graphlimit=100;; esac

if [[ $1 = config ]]; then
    typeset -i percent=100 ncpu=$(/usr/sbin/ioscan -kd processor|grep -c processor)
    (( ncpu )) && ((percent*=ncpu))
    cpumax=$graphlimit

    # Indifferently carried over these crude threshold assumptions
    # from the original cpu plugin; should better be passed as envs
    # via plugins.conf

    syswarn=$((cpumax * SYSWPCT / 100))
    syscrit=$((cpumax * SYSCPCT / 100))
    usrwarn=$((cpumax * USRWPCT / 100))

    echo 'graph_title CPU usage'
    echo 'graph_order system user waitio idle'
    echo 'graph_category system'
    echo "graph_args --base 1000 --lower-limit 0 --rigid --upper-limit $graphlimit"
    echo 'graph_vlabel %'
    echo 'graph_scale no'
    # shellcheck disable=SC2016
    echo 'graph_period ${graph_period}'
    echo 'system.label system'
    echo 'system.draw AREA'
    echo 'system.type GAUGE'
    echo 'system.min 0'
    echo "system.max $cpumax"
    echo "system.warning $syswarn"
    echo "system.critical $syscrit"
    echo 'user.label user'
    echo 'user.draw STACK'
    echo 'user.type GAUGE'
    echo 'user.min 0'
    echo "user.max $cpumax"
    echo "user.warning $usrwarn"
    echo "waitio.max $cpumax"
    echo 'waitio.label waitio'
    echo 'waitio.draw STACK'
    echo 'waitio.type GAUGE'
    echo 'waitio.min 0'
    echo 'idle.label idle'
    echo 'idle.draw STACK'
    echo 'idle.type GAUGE'
    echo 'idle.min 0'
    echo "idle.max $cpumax"

    # this is kind of daft extrapolation to multi-cpu scaling from
    # sar's average

    if [[ $cpumax != 100 ]]; then
	echo "system.cdef system,$ncpu,*"
	echo "user.cdef user,$ncpu,*"
	echo "waitio.cdef waitio,$ncpu,*"
	echo "idle.cdef idle,$ncpu,*"
    fi
    exit 0
fi

sar -u 2 2 |\
awk '/verage/{printf"user.value %d\nsystem.value %d\nwaitio.value %d\nidle.value %d\n",$2,$3,$4,$5}'