Blame tests/p_sysstat/05-iostat-cpu-basic.sh

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#!/bin/bash
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# Author: Steve Barnes (steve@echo.id.au)
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# A simple iostat test to verify cpu loads are being recorded
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t_Log "Running $0 - a basic iostat test to verify cpu measurement"
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# Save our iostat output somewhere
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TMP=/tmp/iostat.cpu.scratch
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# Clear out the pagecache to get an accurate reading
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echo 1 > /proc/sys/vm/drop_caches
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# Clean up after ourselves
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trap "[ -e $TMP ] && { /bin/rm -f $TMP; }" EXIT
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# Capture a storage device name
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DRIVE=$(fdisk -l|grep -Po -m1 '^/dev/[\D]+')
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# Run iostat on the cpu
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/usr/bin/iostat -c 1 5 >$TMP &
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# Let the dust settle
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sleep 4
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# Give the CPU something to chew on
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/bin/dd if=$DRIVE bs=4k count=25000 2>/dev/null|sha1sum -b - &>/dev/null
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# Give iostat a chance to log our task
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sleep 6
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# Extract the CPU utilisation (user field, percentage)
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CPU_USER_PCENT=$(awk '$1 ~ /[0-9]/ {$1>a ? a=$1 : $1} END {print int(a)}' $TMP)
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# Confirm the CPU registered some level of user activity
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[ "$CPU_USER_PCENT" -gt 3 ] || { t_Log "iostat didn't log any CPU activity?!...that ain't good"; }
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t_CheckExitStatus $?