监控cpu空闲率打印java堆栈信息

#sh
CURRENT_FREE_CPU=90
CURRENT_FREE_CPU=`vmstat 1 3 |sed -n '3,$p' |awk '{x = x + $15} END {print x/3}' |awk -F. '{print $1}'`
echo $CURRENT_FREE_CPU
if [ $CURRENT_FREE_CPU -lt 30 ] && [ ! -f "/root/generated" ]  then
javaid=(ps -A |grep "java"| awk '{print $1}')
echo "" > generated
/usr/bin/jmap -dump:format=b,file=heapDump $javaid
fi

crontab 每30秒一次

crontab -e

* * * * * sleep 30; /root/monitorcpu.sh

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