33 lines
942 B
Bash
33 lines
942 B
Bash
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#!/bin/bash
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# Tiny Linux /proc/<pid>/schedstat demo script by Tanel Poder
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# https://tanelpoder.com
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#
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# You may want to run this with high priority:
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# sudo nice -n -10 ./runqlat.sh PID
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#
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# currently this script assumes that it will speep exactly for $SLEEP
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# seconds, but it can itself be affected by CPU overload and you may
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# see values that don't add up to 1000 ms per sec
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# (or negative percentages in the derived BLKD% column)
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PID=$1
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SLEEP=1
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echo Sampling /proc/$PID/schedstat every $SLEEP seconds...
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printf "%6s %6s %6s\n" "CPU%" "RUNQ%" "SLP%"
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while true ; do
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read -r CPU_NS_1 LAT_NS_1 SLICES_ON_THIS_CPU_1 < /proc/$PID/schedstat
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sleep $SLEEP
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read -r CPU_NS_2 LAT_NS_2 SLICES_ON_THIS_CPU_2 < /proc/$PID/schedstat
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ON_CPU=$((($CPU_NS_2-$CPU_NS_1)/10000000))
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ON_RUNQ=$((($LAT_NS_2-$LAT_NS_1)/10000000))
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OTHER=$((100-($ON_CPU+ON_RUNQ)))
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printf "%6d %6d %6d" $ON_CPU $ON_RUNQ $OTHER
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echo
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done
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