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Java线程监控

第一步,找出Java进程PID:

ps -ef | grep java | grep -v “grep” | awk ‘{print $2}’

 第二步,找出最耗CPU的线程:

ps -mp pid -o THREAD,tid,time | sort -rn -k9

第三步,将tid转换为16进制:

printf “%x\n” tid

第四步,dumpJVM的堆栈信息:

jstack pid

jstack中的nid对应于前面的16进制tid,由此找到最耗cpu的线程代码。

使用top命令获取线程

top -Hp pid

 

附上一段完整脚本:http://blog.91gaoqing.com/archives/253.html

#!/bin/shexport LANG="zh_CN.UTF-8";export LC_ALL="zh_CN.UTF-8";LOG_FILE="/tmp/jmonitor.log";JSTACK_FILE="/tmp/jstack.log";PID="$1";shift;i=0;j="$1";if [ -z "${j}" ]; then    j=5;fips -mp ${PID} -o THREAD,tid,time | sort -rn > ${LOG_FILE};jstack ${PID} > ${JSTACK_FILE};for LINE in `cat ${LOG_FILE}|gawk -F -{print $4}‘|gawk -F {print $1}`do    i=$(($i+1));    if (($i>$j)); then        break;    fi;    XPID=`printf "%x\n" ${LINE}`;    echo -ne "\033[32m";    echo ${XPID};    echo -e "\033[34m";    grep -A 10 "0x${XPID}" ${JSTACK_FILE};    echo -e "\e[0m";done;

 

Java线程监控