Munin contributed plugins

#! /bin/sh

# Multigraph CPU plugin

# It shows a global cpu graph, and you can drill down per-core

PLUGINBASE=$(basename $0)

emit_config()

{

cat <<'EOF'

graph_title CPU usage

graph_order system user nice idle iowait irq softirq

graph_vlabel %

graph_scale no

graph_info This graph shows how CPU time is spent.

graph_category system

graph_period second

system.label system

system.draw AREA

system.min 0

system.type DERIVE

system.info CPU time spent by the kernel in system activities

user.label user

user.draw STACK

user.min 0

user.type DERIVE

user.info CPU time spent by normal programs and daemons

nice.label nice

nice.draw STACK

nice.min 0

nice.type DERIVE

nice.info CPU time spent by nice(1)d programs

idle.label idle

idle.draw STACK

idle.min 0

idle.type DERIVE

idle.info Idle CPU time

iowait.label iowait

iowait.draw STACK

iowait.min 0

iowait.type DERIVE

iowait.info CPU time spent waiting for I/O operations to finish when there is nothing else to do.

irq.label irq

irq.draw STACK

irq.min 0

irq.type DERIVE

irq.info CPU time spent handling interrupts

softirq.label softirq

softirq.draw STACK

softirq.min 0

softirq.type DERIVE

softirq.info CPU time spent handling "batched" interrupts

steal.label steal

steal.draw STACK

steal.min 0

steal.type DERIVE

steal.info The time that a virtual CPU had runnable tasks, but the virtual CPU itself was not running

guest.label guest

guest.draw STACK

guest.min 0

guest.type DERIVE

guest.info The time spent running a virtual CPU for guest operating systems under the control of the Linux kernel.

EOF

}

CPUS=$(grep '^cpu[0-9]' /proc/stat | cut -d ' ' -f 1)

if [ "$1" = "config" ]

then

	echo multigraph $PLUGINBASE

	emit_config

	# Emit one subgraph per core

	for cpu in $CPUS

	do

		echo multigraph $PLUGINBASE.$cpu

		emit_config

	done

	exit 0

fi

emit_values()

{

	while read key system user nice idle iowait irq softirq steal guest unused

	do

		[ "$key" != "$1" ] && continue

		cat <<EOF

system.value $system

user.value $user

nice.value $nice

idle.value $idle

iowait.value $iowait

irq.value $irq

softirq.value $softirq

steal.value $steal

guest.value $guest

EOF

	done < /proc/stat

}

# Values

echo multigraph $PLUGINBASE

emit_values cpu

# Emit one subgraph per core

for cpu in $CPUS

do

	echo multigraph $PLUGINBASE.$cpu

	emit_values $cpu

done

exit 0