infrastructure-examples/java/util/java-thread-high-cpu.sh at main · codejsha/infrastructure-examples · GitHub

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#!/bin/bash

trap 'echo "${BASH_SOURCE[0]}: line ${LINENO}: status ${?}: user ${USER}: func ${FUNCNAME[0]}"' ERR

set -o errexit

set -o errtrace

### Usage:

### bash ./java-thread-high-cpu.sh <PID>

PID="${1}"

JAVA_HOME="/usr/lib/jvm/java-11"

# JAVA_HOME="/usr/lib/jvm/java-1.8.0"

LOOP_COUNT="1"

TOP_THREAD_COUNT="5"

INTERVAL_SECONDS="5"

if [ -z "${PID}" ]; then

echo "Usage: bash ./java-thread-high-cpu.sh <PID>"

exit

if [ -z "${JAVA_HOME}" ]; then

echo "[ERROR] The JAVA_HOME (${JAVA_HOME}) does not exist!"

exit

for IDX1 in $(seq 1 ${LOOP_COUNT})

echo "[INFO] Print ${IDX1} times..."

ps -eLo pid,ppid,tid,pcpu,comm | grep ${PID} > ps-${PID}-${IDX1}.out

${JAVA_HOME}/bin/jstack -l ${PID} > threaddump-${PID}-${IDX1}.tdump

top -b -n 1 -p ${PID} > top-${PID}-${IDX1}.out

HIGH_CPU_THREADS=($(cat ps-${PID}-${IDX1}.out | awk '{ print $4" "$3 }' \

| sort --reverse --numeric-sort | head --lines=${TOP_THREAD_COUNT} | awk '{ print $2 }'))

for IDX2 in $(seq 0 $((${TOP_THREAD_COUNT} - 1)))

printf '0x%x\n' ${HIGH_CPU_THREADS[$IDX2]}

done

sleep ${INTERVAL_SECONDS}

done

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