如果CPU占用率持续达到80以上则调用打印java线程占用率堆栈的脚本，见https://github.com/oldratlee/useful-shells/blob/master/show-busy-java-threads.sh，具体用法见他的github wiki！
#!/bin/bash
#cpu idle percent
cpu_idle=`top -b -d 1 -n 2 | grep Cpu | awk 'NR>1{print $5}' | cut -f 1 -d "."`
if [ -d "/opt/scripts/log" ]
then
cd /opt/scripts
else
mkdir /opt/scripts/log
fi
count=0
condition=true
while condition
do
if [ $cpu_idle -le 20 ]
then
pids=`top -b -d 1 -n 1 | grep java | awk '{if($9 > 80) print $1}'`
for ((a = 1; a < 10; a++))
do
for pid in $pids
doi
#involve jdk existence check later
date=`date +%Y%m%d%H%M`
sh showstack.sh -c 30 -p $pid > log/stack_$pid_$date.log
jstat -gcutil $pid > log/gc_$pid_$date.log
done
done
for pid in $pids
do
date=`date +%Y%m%d%H%M`
jmap -heap $pid > log/heap_$pid_$date.log
done
count++
cpu_idle=`top -b -d 1 -n 2 | grep Cpu | awk 'NR>1{print $5}' | cut -f 1 -d "."`
if [ $count -ge 3]
then
#send emaili
#server ip address
ip=`ifconfig eth0 | grep "inet addr" | cut -f 2 -d ":" | cut -f 1 -d " "`
condition=false
count=0
fi
else
condition=false
count=0
fi
done
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