2020-04-01 linux上快速打印出最占cpu的java

top -d 1找出最占资源的java进程的pid和cpu，内存大概的占用率

759502 runtime   20   0 10.244g 5.365g  14796 S   9.9 22.9 240058:48 java

编写 jvmtop.sh 文件保存到/tmp目录

export LANG="zh_CN.UTF-8";
export LC_ALL="zh_CN.UTF-8";

LOG_FILE="jvmtop.log";
JSTACK_FILE="jstack.log";

PID="$1";
shift;
i=0;
j="$1";
if [ -z "${j}" ]; then
    j=5;
fi

ps -mp ${PID} -o THREAD,tid,time | sort -rn > ${LOG_FILE};
jstack ${PID} > ${JSTACK_FILE};
chmod 777 ${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;

打印出java进程中cpu占用最高的线程id

sudo -u runtime bash jvmtop.sh  759502