Created
June 7, 2021 07:18
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Monitor CPU per Core
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#!/bin/bash | |
function getCPU(){ | |
LCPU=`grep "^processor" /proc/cpuinfo | sort -u | wc -l` | |
echo -n $LCPU-1 | |
} | |
function getCpuUtilizationByCore(){ | |
# Format: cpu<Number> | |
local CoreName="$1" | |
#cpu_util=<(grep $CoreName /proc/stat) <(sleep 1 && grep $CoreName /proc/stat) | awk -v RS="" '{print ($13-$2+$15-$4)*100/($13-$2+$15-$4+$16-$5)}' #PERMISSION DENIED | |
cpu_util=$(awk '{u=$2+$4; t=$2+$4+$5; if (NR==1){u1=u; t1=t;} else print ($2+$4-u1) * 100 / (t-t1); }' <(grep $CoreName /proc/stat) <(sleep 1;grep $CoreName /proc/stat) | cut -d "." -f 1) | |
echo -n "${cpu_util}" | |
} | |
CPUcount=$(getCPU); | |
for (( i=0; i<=$CPUcount; i++ )) do | |
CoreUsage=$(getCpuUtilizationByCore "cpu$i") | |
echo "CPU Core $i : $CoreUsage"; | |
done | |
#keyword: cpu, core, monitor, flamegraph, debug | |
# OUTPUT | |
# test with "stress --cpu 2" | |
CPU Core 0 : 100 | |
CPU Core 1 : 42 | |
CPU Core 2 : 2 | |
CPU Core 3 : 100 |
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