Print most CPU consuming threads in descending order for selected Java process (./cpu_consumers.sh | tee consumers.txt)

cpu_consumers.sh

#!/bin/bash


function print_lwp_line() {
    local pid="${1}"
    local lwp="${2}"
    local nlwp="${3}"
    local ruser="${4}"
    local pcpu="${5}"
    local cputimes="${6}"
    local lwp_name="${7}"

    printf "%8s %8s %5s %10s %8s %8s  %s\n" ${pid} ${lwp} ${nlwp} ${ruser} ${pcpu} ${cputimes} "${lwp_name}"
}


readarray -t processes < <(jps -l)

echo "Choose java process:" >&2
for process_index in ${!processes[@]}; do
    pid=$( echo ${processes[process_index]} | cut -d ' ' -f 1)
    class=$( echo ${processes[process_index]} | cut -d ' ' -f 2)
    printf "%3s %8s  %s\n" "${process_index})" "${pid}" "${class}" >&2
done

while :; do
    read -r -p "Enter process choice: " chosen_process_index
    [[ -z "${chosen_process_index}" ]] && break
    [[ -n "${processes[chosen_process_index]}" ]] && break
done

target_pid="$( echo ${processes[chosen_process_index]} | cut -d ' ' -f 1)"
target_class="$( jps | grep ${target_pid} | cut -d ' ' -f 2)"
target_cmd="$(jps -lvm | grep ${target_pid} | sed 's/ -/\n-/g' | sort )"
target_td="${target_class}.${target_pid}.dat"

jstack ${target_pid} > ${target_td}

echo -e "\n${target_cmd}\n"

print_lwp_line "PID" "LWP" "NLWP" "ruser" "CPU[%]" "CPU[s]" "thread_name"
ps -Leo pid,lwp,nlwp,ruser,pcpu,cputimes | grep ${target_pid} | sort -r -k 5 | while read line; do
    lwp=$( echo ${line} | awk '{print $2}' )
    hex_lwp=$(printf '%x' ${lwp})
    lwp_name=$( grep "nid=0x${hex_lwp}" ${target_td} | sed 's/" .*$//' | sed 's/"//g')
    print_lwp_line ${line} "${lwp_name}"
done