Munin contributed plugins

#!/bin/sh

#

# Plugin to measure average CPU frequency for each CPU/core.

#

# Contributed by Mark Edwards

#

# Usage: Place in /etc/munin/plugins (or link it there  using ln -s)

#

# Parameters understood:

#

#       config   (required)

#       autoconf (optional - used by munin-config)

#

# $Log$

#

# Revision 0.2  2010/01/04 16:37:00  medwards

# Minor bugfixes in config section

#

# Revision 0.1  2010/01/04 16:13:00  medwards

# First version

#

#

#

# Magic markers - optional - used by installation scripts and

# munin-config:

#

#%# family=auto

#%# capabilities=autoconf

if [ "$1" = "autoconf" ]; then

		if [ -r /sys/devices/system/cpu/cpu0/cpufreq/stats/time_in_state ]; then

			echo yes

			exit 0

		else

			echo no

			exit 1

		fi

fi

cpu_count=`grep -c "^processor" /proc/cpuinfo`

if [ "$1" = "config" ]; then

		echo 'graph_title Average CPU Frequency'

		up_lim=`cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq`

		low_lim=`cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq`

		up_lim=`expr $up_lim \* 1000` # Convert to Hz

		low_lim=`expr $low_lim \* 1000` # Convert to Hz

		echo "graph_args -u $up_lim -l $low_lim -r --base 1000"

		echo 'graph_vlabel Hz'

		echo 'graph_category system'

		cpu=0

		while [ $cpu -lt $cpu_count ]

		do

			echo "cpu_$cpu.label CPU $cpu"

			echo "cpu_$cpu.type GAUGE"

			echo "cpu_$cpu.info Hz"

			cpu=`expr $cpu + 1`

		done

		exit 0

fi

# Run measurements

cpu=0

while [ $cpu -lt $cpu_count ]

do

	time_in_state=`cat /sys/devices/system/cpu/cpu$cpu/cpufreq/stats/time_in_state`

	# Check/create statefile(s)

	statefile="/var/lib/munin/plugin-state/cpufreq-avg_cpu$cpu.state"

	if [ ! -r "$statefile" ]

	then

		echo "$time_in_state" > $statefile

		if [ "$?" -ne "0" ]

		then

			exit ${1}

		else

			cpu=`expr $cpu + 1`

			continue

		fi

	fi

	state=`cat $statefile`

	# Calculated total time since last state

	total_time=0

	total_time=$(

		echo "$time_in_state" | { 

			i=0

			while read line

			do

				this_freq=`echo $line | awk '{ print $1; }'`

				this_time=`echo $line | awk '{ print $2; }'`

				this_time_state=`echo "$state" | grep $this_freq | awk '{ print $2; }'`

				if [ $this_time -ge $this_time_state ] # Only measure if state is valid

				then

					time_diff=`expr $this_time - $this_time_state` # Calculate time since last state

					total_time=`expr $total_time + $time_diff`

				fi

				i=`expr $i + 1`

			done

			echo $total_time

		}

	)

	# Measure average CPU frequency if total time calculation was successful

	frequency=0

	frequency=$(

		echo "$time_in_state" | {

			i=0

			while read line

			do

				this_freq=`echo $line | awk '{ print $1; }'`

				this_time=`echo $line | awk '{ print $2; }'`

				this_time_state=`echo "$state" | grep $this_freq | awk '{ print $2; }'`

				this_freq=`expr $this_freq \* 1000` # Convert to Hz

				this_time=`expr $this_time - $this_time_state` # Calculate time since last state

				if [ $total_time -gt 0 ]

				then

					calc=`echo "($this_time / $total_time) * $this_freq" | bc -l`

					frequency=`echo "$frequency + $calc" | bc -l`

				fi

				i=`expr $i + 1`

			done

			echo $frequency

		}

	)

	# Round result to an integer and return it

	frequency=`echo "scale=0 ; ($frequency+0.5)/1" | bc -l`

	if [ $frequency -gt 0 ]

	then

		echo "cpu_$cpu.value $frequency"

	fi

	# Update statefile

	echo "$time_in_state" > $statefile

	cpu=`expr $cpu + 1`

done

exit 0