排查占用资源java代码脚本

show-busy-java-threads.sh（摘自：https://github.com/oldratlee/useful-scripts/blob/master/show-busy-java-threads.sh）

 

 

#!/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
	readonly PROG=`basename $0`
	readonly -a COMMAND_LINE=("$0" "$@")
	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 $1
	}
	readonly ARGS=`getopt -n "$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 "$@"
	echo -e "\033[0m"
	} || echo "$@"
	}
	yellowEcho() {
	[ -c /dev/stdout ] && {
	# if stdout is console, turn on color output.
	echo -ne "\033[1;33m"
	echo -n "$@"
	echo -e "\033[0m"
	} || echo "$@"
	}
	blueEcho() {
	[ -c /dev/stdout ] && {
	# if stdout is console, turn on color output.
	echo -ne "\033[1;36m"
	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:$PATH"
	fi
	readonly uuid=`date +%s`_${RANDOM}_$$
	cleanupWhenExit() {
	rm /tmp/${uuid}_* &> /dev/null
	}
	trap "cleanupWhenExit" EXIT
	printStackOfThreads() {
	local line
	local count=1
	while IFS=" " read -a line ; do
	local pid=${line[0]}
	local threadId=${line[1]}
	local threadId0x="0x`printf %x ${threadId}`"
	local user=${line[2]}
	local pcpu=${line[4]}
	local jstackFile=/tmp/${uuid}_${pid}
	[ ! -f "${jstackFile}" ] && {
	{
	if [ "${user}" == "${USER}" ]; then
	jstack ${pid} > ${jstackFile}
	else
	if [ $UID == 0 ]; then
	sudo -u ${user} jstack ${pid} > ${jstackFile}
	else
	redEcho "[$((count++))] Fail to jstack Busy(${pcpu}%) thread(${threadId}/${threadId0x}) stack of java process(${pid}) under user(${user})."
	redEcho "User of java process($user) is not current user($USER), need sudo to run again:"
	yellowEcho " sudo ${COMMAND_LINE[@]}"
	echo
	continue
	fi
	fi
	} || {
	redEcho "[$((count++))] Fail to jstack Busy(${pcpu}%) thread(${threadId}/${threadId0x}) stack of java process(${pid}) under user(${user})."
	echo
	rm ${jstackFile}
	continue
	}
	}
	blueEcho "[$((count++))] Busy(${pcpu}%) thread(${threadId}/${threadId0x}) stack of java process(${pid}) under user(${user}):"
	sed "/nid=${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}" | printStackOfThreads