get_io_rate.sh

get_io_rate.sh

#!/usr/bin/env bash
[ -z $1 ] && echo "Gimme the PID" && exit 1

PIDNUM=$1
declare -A CURRENT
declare -A NEXT

export FLAG=0

get_io() {
  myarr=($(cat /proc/$PIDNUM/io | awk  '{print $1$2}'))

  for i in "${myarr[@]}"
  do
    KEY=$(echo $i | cut -d : -f1)
    VAL=$(echo $i | cut -d : -f2)
    if [ $FLAG == 0 ]; then
      CURRENT[$KEY]=$VAL
      export FLAG=1
    else
      NEXT[$KEY]=$VAL
      export FLAG=0
    fi
  done
}

get_rate() {
  get_io
  sleep 1
  get_io

  READ_VIRT=$(expr $(expr ${NEXT["rchar"]} - ${CURRENT["rchar"]}) / 1024)
  WRITE_VIRT=$(expr $(expr ${NEXT["wchar"]} - ${CURRENT["wchar"]}) / 1024)
  READ_PHYS=$(expr $(expr ${NEXT["read_bytes"]} - ${CURRENT["read_bytes"]}) / 1024)
  WRITE_PHYS=$(expr $(expr ${NEXT["write_bytes"]} - ${CURRENT["write_bytes"]}) / 1024)
  clear

  echo "==================================================="
  echo "Data read by the process    : ${READ_VIRT#-} KB/s"
  echo "Data written by the process : ${WRITE_VIRT#-} KB/s"
  echo "Data read from storage      : ${READ_PHYS#-} KB/s"
  echo "Data written to storage     : ${WRITE_PHYS#-} KB/s"
  echo "==================================================="
}

while true
do
  get_rate
done