Please follow the commands provided here to take the thread dump.
First you need to create test.sh script using following command.
vi test.sh
Then paste following script content.
#!/bin/bash
# 1: ['command\ name' or PID number(,s)] 2: MAX_CPU_PERCENT
[[ $# -ne 2 ]] && exit 1
PID_NAMES=$1
# get all PIDS as nn,nn,nn
if [[ ! "$PID_NAMES" =~ ^[0-9,]+$ ]] ; then
PIDS=$(pgrep -d ',' -x $PID_NAMES)
else
PIDS=$PID_NAMES
fi
# echo "$PIDS $MAX_CPU"
MAX_CPU="$2"
MAX_CPU="$(echo "($MAX_CPU+0.5)/1" | bc)"
LOOP=1
while [[ $LOOP -eq 1 ]] ; do
sleep 0.3s
# Depending on your 'top' version and OS you might have
# to change head and tail line-numbers
LINE="$(top -b -d 0 -n 1 -p $PIDS | head -n 8 \
| tail -n 1 | sed -r 's/[ ]+/,/g' | \
sed -r 's/^\,|\,$//')"
# If multiple processes in $PIDS, $LINE will only match\
# the most active process
CURR_PID=$(echo "$LINE" | cut -d ',' -f 1)
# calculate cpu limits
CURR_CPU_FLOAT=$(echo "$LINE"| cut -d ',' -f 9)
CURR_CPU=$(echo "($CURR_CPU_FLOAT+0.5)/1" | bc)
echo "PID $CURR_PID: $CURR_CPU""%"
if [[ $CURR_CPU -ge $MAX_CPU ]] ; then
now="$(date)"
echo "PID $CURR_PID ($PID_NAMES) went over $MAX_CPU""%" on $now
jstack $CURR_PID > ./$now+jlog.txt
echo "[[ $CURR_CPU""% -ge $MAX_CPU""% ]]"
LOOP=0
break
fi
done
echo "Stopped"
Then we need to get process id of running WSO2 server by running following command.
sanjeewa@sanjeewa-ThinkPad-T530:~/work$ jps
30755 Bootstrap
8543 Jps
4892 Main
Now we know carbon server running with process ID 30755. Then we can start our script by providing init parameters(process ID and CPU limit). So it will keep printing CPU usage in terminal and once it reached limit it will take thread dump using jstack command. It will create new file with with embedding current date time and push Jstack output to it.
We can start scritp like this.
sanjeewa@sanjeewa-ThinkPad-T530:~/work$ sh test.sh 30755 99
As you can see when CPU goes above 99% it will create log file and append thread dump.
