interrupts
Sadly there is no documentation for this plugin.
#!/bin/sh
#
# Plugin to monitor the number of interrupts and context switches on a system.
#
# Idea and base from Ragnar Wisløff.
#
# Usage: Link or copy into /etc/munin/node.d/
#
# $Log: interrupts.in,v $
# Revision 1.1.1.1 2006/06/04 20:53:57 he
# Import the client version of the Munin system monitoring/graphing
# tool -- project homepage is at http://munin.sourceforge.net/
#
# This package has added support for NetBSD, via a number of new plugin
# scripts where specific steps needs to be taken to collect information.
#
# I also modified the ntp_ plugin script to make it possible to not
# plot the NTP poll delay, leaving just jitter and offset, which IMO
# produces a more telling graph.
#
#
#
# Magic markers (optional - only used by munin-config and some
# installation scripts):
#
#%# family=auto
#%# capabilities=autoconf
if [ "$1" = "autoconf" ]; then
if [ -x /usr/bin/vmstat ]; then
echo yes
exit 0
else
echo no
exit 0
fi
fi
# If run with the "config"-parameter, give out information on how the
# graphs should look.
if [ "$1" = "config" ]; then
# The title of the graph
echo 'graph_title Interrupts & context switches'
# Arguments to "rrdtool graph". In this case, tell it that the
# lower limit of the graph is '0', and that 1k=1000 (not 1024)
echo 'graph_args --base 1000 -l 0'
# The Y-axis label
echo 'graph_vlabel interrupts & ctx switches / ${graph_period}'
# Graph category
echo 'graph_category system'
# Graph information
echo 'graph_info This graph shows the number of interrupts and context switches on the system. These are typically high on a busy system.'
echo 'devint.info Device interrupts come from hardware (exceptions, NMI, IRQ)'
echo 'softint.info Software interrupts are typically deferred processing from hardware interrupts'
echo 'ctx.info A context switch occurs when a multitasking operatings system suspends the currently running process, and starts executing another.'
# The fields. "label" is used in the legend. "label" is the only
# required subfield.
echo 'devint.label device interrupts'
echo 'softint.label software interrupts'
echo 'ctx.label context switches'
# Specify type
echo 'devint.type DERIVE'
echo 'softint.type DERIVE'
echo 'ctx.type DERIVE'
# Set max (should always be done with counters) Note: this is max
# per second.
echo 'devint.max 100000'
echo 'softint.max 100000'
echo 'ctx.max 100000'
echo 'devint.min 0'
echo 'softint.min 0'
echo 'ctx.min 0'
# Last, if run with the "config"-parameter, quit here (don't
# display any data)
exit 0
fi
# The real work
vmstat -s | awk '
/device interrupts$/ { print "devint.value " $1; }
/context switches$/ { print "ctx.value " $1; }
/software interrupts$/ { print "softint.value " $1; }
'