分析定位占用CPU资源高的JVM线程

Posted 2022-12-04 星力量

分析定位占用CPU资源高的JVM线程

1.  获得高负载的进程号pid :  ps -ef | grep java

2.  执行shell 脚本(topthread.sh)来分析定位占用CPU资源的线程;

3.  分析线程对应的代码片段来优化修复问题.

topthread.sh 脚本(带参pid)片段: 

#!/bin/sh
export LANG="zh_CN.UTF-8";
export LC_ALL="zh_CN.UTF-8";

LOG_DIR="/tmp/";
LOG_FILE="_thread.log";
JSTACK_FILE="_jstack.log";

PID="$1";
shift;
i=0;
topline=20;

if [ -z "$PID" ]; then
    exit "pid is empty.";
fi

if [[ "$2" =~ ^[0-9]+$ ]]; then
    topline="$2";
fi

LOG_FILE= $LOG_DIR$PID$LOG_FILE;
JSTACK_FILE= $LOG_DIR$PID$JSTACK_FILE;

ps -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>$topline)); 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;