contrib-munin/plugins/raspberry-pi/cpu_freq_1sec

#! /bin/sh
# 
# This is a small supersampling plugin that does 
# cpu sampling every 1 second.
# 
# (c) 2013 - LGPL - Steve Schnepp <steve.schnepp@pwkf.org>

pluginfull="$0"                 # full name of plugin
plugin="${0##*/}"               # name of plugin
pidfile="$MUNIN_PLUGSTATE/munin.$plugin.pid"
cache="$MUNIN_PLUGSTATE/munin.$plugin.value"


if [ ! -r "/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq" ]
then
	echo "# Cannot read CPU Freq"
	exit 1
fi

if [ "$1" = "acquire" ]
then
        (
                while sleep 1
                do
                        echo $(
                                date +%s
                                cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
                        )
                done | awk "{
                    print \"scaling_cur_freq.value \" \$1 \":\" (\$2 * 1000);
                    system(\"\");
                }" >> $cache
        ) &
        echo $! > $pidfile
        exit 0
fi


if [ "$1" = "config" ]
then
        cat <<EOF
graph_title CPU Freq 1sec stats
graph_category 1sec::cpu
graph_data_size custom 1d, 10s for 1w, 1m for 1t, 5m for 1y
graph_vlabel Hz
update_rate 1
scaling_cur_freq.label Current CPU Scaling Frequence
scaling_cur_freq.type GAUGE
EOF
        exit 0
fi

# values
cat ${cache}
> ${cache}

exit 0