分析java进程cpu使用率过高的shell脚本

#!/bin/bash 
# @Function 
# Find out the highest cpu consumed threads of java, and print the stack of these threads. 
# 
# @Usage 
#   $ ./show-busy-java-threads.sh 
# 
# @author Jerry Lee 
 
PROG=`basename $0` 
 
usage() { 
    cat <<EOF 
Usage: ${PROG} [OPTION]... 
Find out the highest cpu consumed threads of java, and print the stack of these threads. 
Example: ${PROG} -c 10 
Options: 
    -p, --pid       find out the highest cpu consumed threads from the specifed java process, 
                    default from all java process. 
    -c, --count     set the thread count to show, default is 5 
    -h, --help      display this help and exit 
EOF 
    exit $1 
} 
 
ARGS=`getopt -n "$PROG" -a -o c:p:h -l count:,pid:,help -- "$@"` 
[ $? -ne 0 ] && usage 1 
eval set -- "${ARGS}" 
 
while true; do 
    case "$1" in 
    -c|--count) 
        count="$2" 
        shift 2 
        ;; 
    -p|--pid) 
        pid="$2" 
        shift 2 
        ;; 
    -h|--help) 
        usage 
        ;; 
    --) 
        shift 
        break 
        ;; 
    esac 
done 
count=${count:-5} 
 
redEcho() { 
    [ -c /dev/stdout ] && { 
        # if stdout is console, turn on color output. 
        echo -ne "\033[1;31m" 
        echo -n "$@" 
        echo -e "\033[0m" 
    } || echo "$@" 
} 
 
# Check the existence of jstack command! 
if ! which jstack &> /dev/null; then 
    [ -z "$JAVA_HOME" ] && { 
        redEcho "Error: jstack not found on PATH!" 
        exit 1 
    } 
    ! [ -f "$JAVA_HOME/bin/jstack" ] && { 
        redEcho "Error: jstack not found on PATH and $JAVA_HOME/bin/jstack file does NOT exists!" 
        exit 1 
    } 
    ! [ -x "$JAVA_HOME/bin/jstack" ] && { 
        redEcho "Error: jstack not found on PATH and $JAVA_HOME/bin/jstack is NOT executalbe!" 
        exit 1 
    } 
    export PATH="$JAVA_HOME/bin:$PATH" 
fi 
 
uuid=`date +%s`_${RANDOM}_$$ 
 
cleanupWhenExit() { 
    rm /tmp/${uuid}_* &> /dev/null 
} 
trap "cleanupWhenExit" EXIT 
 
printStackOfThread() { 
    while read threadLine ; do 
        pid=`echo ${threadLine} | awk '{print $1}'` 
        threadId=`echo ${threadLine} | awk '{print $2}'` 
        threadId0x=`printf %x ${threadId}` 
        user=`echo ${threadLine} | awk '{print $3}'` 
        pcpu=`echo ${threadLine} | awk '{print $5}'` 
 
        jstackFile=/tmp/${uuid}_${pid} 
 
        [ ! -f "${jstackFile}" ] && { 
            jstack ${pid} > ${jstackFile} || { 
                redEcho "Fail to jstack java process ${pid}!" 
                rm ${jstackFile} 
                continue 
            } 
        } 
 
        redEcho "Busy(${pcpu}%) thread(${threadId}/0x${threadId0x}) stack of java process(${pid}) under user(${user}):" 
        sed "/nid=0x${threadId0x} /,/^$/p" -n ${jstackFile} 
    done 
} 
 
ps -Leo pid,lwp,user,comm,pcpu --no-headers | { 
    [ -z "${pid}" ] && 
    awk '$4=="java"{print $0}' || 
    awk -v "pid=${pid}" '$1==pid,$4=="java"{print $0}' 
} | sort -k5 -r -n | head --lines "${count}" | printStackOfThread