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| -rwxr-xr-x | etc/munin/plugins/cpu | 246 |
1 files changed, 246 insertions, 0 deletions
diff --git a/etc/munin/plugins/cpu b/etc/munin/plugins/cpu new file mode 100755 index 00000000..1708bcf6 --- /dev/null +++ b/etc/munin/plugins/cpu @@ -0,0 +1,246 @@ +#!/bin/sh +# +: <<=cut + +=head1 NAME + +cpu - Plugin to monitor CPU usage. + +=head1 APPLICABLE SYSTEMS + +All Linux systems + +=head1 CONFIGURATION + +The following is default configuration + + [cpu] + env.HZ 100 + +See "BUGS" for a explanation of this setting. + +=head2 EXAMPLE WARNING AND CRITICAL SETTINGS + +You can also set warning and critical levels for each of the data +series the plugin reports. The following environment variables are +used as default for all fields: + + env.warning + env.critical + +But each field can be controlled separately: + + env.system_warning + env.system_critical + + env.user_warning + env.user_critical + + env.nice_warning + env.nice_critical + + env.idle_warning + env.idle_critical + +For some kernels there is also the following settings: + + env.iowait_warning + env.iowait_critical + env.irq_warning + env.irq_critical + env.softirq_warning + env.softirq_critical + env.steal_warning + env.steal_critical + env.guest_warning + env.guest_critical + +=head1 INTERPRETATION + +The plugin shows cpu usage in percent. In case of more than one core +it displays 100% for each core. + +If a core is 100% busy there will be no "iowait" showing, that only +shows if the CPU has nothing else to do while it waits on IO. +Therefore a 100% busy core can hide a lot of iowait. Please refer to +the IO latency and other disk related graphs for further information +about IO performance. + +=head1 MAGIC MARKERS + + #%# family=auto + #%# capabilities=autoconf + + +=head1 VERSION + + $Id$ + +=head1 BUGS + +Some combinations of hardware and Linux (probably only 2.4 kernels) +use 1000 units/second in /proc/stat corresponding to the systems +HZ. (see /usr/src/linux/include/asm/param.h). But Almost all systems +use 100 units/second and this is our default. Even if +Documentation/proc.txt in the kernel source says otherwise. - Finding +and fix by dz@426.ch + +Otherwise none known + +=head1 AUTHOR + +Unknown + +=head1 LICENSE + +GPLv2 + +=cut + + +. $MUNIN_LIBDIR/plugins/plugin.sh + +if [ "$1" = "autoconf" ]; then + if [ -r /proc/stat ]; then + echo yes + exit 0 + else + echo no + exit 0 + fi +fi + +HZ=${HZ:-100} + +extinfo="" + +if egrep -q '^cpu +[0-9]+ +[0-9]+ +[0-9]+ +[0-9]+ +[0-9]+ +[0-9]+ +[0-9]+' /proc/stat; then + extinfo="iowait irq softirq" + if egrep -q '^cpu +[0-9]+ +[0-9]+ +[0-9]+ +[0-9]+ +[0-9]+ +[0-9]+ +[0-9]+ +[0-9]+' /proc/stat; then + extextinfo="steal" + fi + if egrep -q '^cpu +[0-9]+ +[0-9]+ +[0-9]+ +[0-9]+ +[0-9]+ +[0-9]+ +[0-9]+ +[0-9]+ +[0-9]+' /proc/stat; then + extextextinfo="guest" + fi + +fi + +if [ "$1" = "config" ]; then + + NCPU=$(egrep '^cpu[0-9]+ ' /proc/stat | wc -l) + if [ "$scaleto100" = "yes" ]; then + graphlimit=100 + else + graphlimit=$(($NCPU * 100)) + fi + echo 'graph_title CPU usage' + echo "graph_order system user nice idle" $extinfo + echo "graph_args --base 1000 -r --lower-limit 0 --upper-limit $graphlimit" + echo 'graph_vlabel %' + echo 'graph_scale no' + echo 'graph_info This graph shows how CPU time is spent.' + echo 'graph_category system' + echo 'graph_period second' + echo 'system.label system' + echo 'system.draw AREA' + echo 'system.min 0' + echo 'system.type DERIVE' + echo "system.info CPU time spent by the kernel in system activities" + echo 'user.label user' + echo 'user.draw STACK' + echo 'user.min 0' + echo 'user.type DERIVE' + echo 'user.info CPU time spent by normal programs and daemons' + echo 'nice.label nice' + echo 'nice.draw STACK' + echo 'nice.min 0' + echo 'nice.type DERIVE' + echo 'nice.info CPU time spent by nice(1)d programs' + echo 'idle.label idle' + echo 'idle.draw STACK' + echo 'idle.min 0' + echo 'idle.type DERIVE' + echo 'idle.info Idle CPU time' + + for field in system user nice idle; do + print_adjusted_thresholds "$field" "$graphlimit" + done + + if [ "$scaleto100" = "yes" ]; then + echo "system.cdef system,$NCPU,/" + echo "user.cdef user,$NCPU,/" + echo "nice.cdef nice,$NCPU,/" + echo "idle.cdef idle,$NCPU,/" + fi + if [ ! -z "$extinfo" ] + then + echo 'iowait.label iowait' + echo 'iowait.draw STACK' + echo 'iowait.min 0' + echo 'iowait.type DERIVE' + echo 'iowait.info CPU time spent waiting for I/O operations to finish when there is nothing else to do.' + echo 'irq.label irq' + echo 'irq.draw STACK' + echo 'irq.min 0' + echo 'irq.type DERIVE' + echo 'irq.info CPU time spent handling interrupts' + echo 'softirq.label softirq' + echo 'softirq.draw STACK' + echo 'softirq.min 0' + echo 'softirq.type DERIVE' + echo 'softirq.info CPU time spent handling "batched" interrupts' + if [ "$scaleto100" = "yes" ]; then + echo "iowait.cdef iowait,$NCPU,/" + echo "irq.cdef irq,$NCPU,/" + echo "softirq.cdef softirq,$NCPU,/" + fi + for field in iowait irq softirq; do + print_adjusted_thresholds "$field" "$graphlimit" + done + fi + + if [ ! -z "$extextinfo" ] + then + echo 'steal.label steal' + echo 'steal.draw STACK' + echo 'steal.min 0' + echo 'steal.type DERIVE' + echo 'steal.info The time that a virtual CPU had runnable tasks, but the virtual CPU itself was not running' + if [ "$scaleto100" = "yes" ]; then + echo "steal.cdef steal,$NCPU,/" + fi + for field in steal; do + print_adjusted_thresholds "$field" "$graphlimit" + done + fi + + if [ ! -z "$extextextinfo" ] + then + echo 'guest.label guest' + echo 'guest.draw STACK' + echo 'guest.min 0' + echo 'guest.type DERIVE' + echo 'guest.info The time spent running a virtual CPU for guest operating systems under the control of the Linux kernel.' + if [ "$scaleto100" = "yes" ]; then + echo "guest.cdef guest,$NCPU,/" + fi + for field in guest; do + print_adjusted_thresholds "$field" "$graphlimit" + done + fi + + exit 0 +fi + +# Note: Counters/derive need to report integer values. Also we need +# to avoid 10e+09 and the like %.0f should do this. + +if [ ! -z "$extextextinfo" ]; then + awk -v hz=$HZ '/^cpu / { epoch = systime(); printf "user.value %d:%.0f\nnice.value %d:%.0f\nsystem.value %d:%.0f\nidle.value %d:%.0f\niowait.value %d:%.0f\nirq.value %d:%.0f\nsoftirq.value %d:%.0f\nsteal.value %d:%.0f\nguest.value %d:%.0f\n", epoch, $2*100/hz, epoch, $3*100/hz, epoch, $4*100/hz, epoch, $5*100/hz, epoch, $6*100/hz, epoch, $7*100/hz, epoch, $8*100/hz, epoch, $9*100/hz, epoch, $10*100/hz }' < /proc/stat +elif [ ! -z "$extextinfo" ]; then + awk -v hz=$HZ '/^cpu / { epoch = systime(); printf "user.value %d:%.0f\nnice.value %d:%.0f\nsystem.value %d:%.0f\nidle.value %d:%.0f\niowait.value %d:%.0f\nirq.value %d:%.0f\nsoftirq.value %d:%.0f\nsteal.value %d:%.0f\n", epoch, $2*100/hz, epoch, $3*100/hz, epoch, $4*100/hz, epoch, $5*100/hz, epoch, $6*100/hz, epoch, $7*100/hz, epoch, $8*100/hz, epoch, $9*100/hz }' < /proc/stat +elif [ ! -z "$extinfo" ]; then + awk -v hz=$HZ '/^cpu / { epoch = systime(); printf "user.value %d:%.0f\nnice.value %d:%.0f\nsystem.value %d:%.0f\nidle.value %d:%.0f\niowait.value %d:%.0f\nirq.value %d:%.0f\nsoftirq.value %d:%.0f\n", epoch, $2*100/hz, epoch, $3*100/hz, epoch, $4*100/hz, epoch, $5*100/hz, epoch, $6*100/hz, epoch, $7*100/hz, epoch, $8*100/hz }' < /proc/stat +else + awk -v hz=$HZ '/^cpu / { epoch = systime(); printf "user.value %d:%.0f\nnice.value %d:%.0f\nsystem.value %d:%.0f\nidle.value %d:%.0f\niowait.value %d:%.0f\nirq.value %d:%.0f\n", epoch, $2*100/hz, epoch, $3*100/hz, epoch, $4*100/hz, epoch, $5*100/hz, epoch, $6*100/hz, epoch, $7*100/hz }' < /proc/stat +fi |