procio.sh: Show process I/O

README.md

procio.sh: Show process I/O

Show process I/O by /proc/<pid>/io.

Usage

procio.sh [OPTIONS ...] <pid>

License

This project is distributed under the MIT license.

procio.sh

#!/usr/bin/env bash

source hhs.bash 0.2.0

function optparse_procio ()
{
  case "$1" in
  -i|--interval) # <sec>
    # Set update interval
    nparams 1
    optset INTERVAL "$2"
    ;;
  *) return 1;;
  esac
}

function procio () # [OPTIONS ...] <pid>
#   Show process I/O
{
  (( $# != 1 )) && { invoke_usage; exit 1; }
  local line i k v t t0 t1 t2 dt0 dt1 r0 w0 r1 w1 r2=0 w2=0
  local -A io
  printf -v t0 "%(%s)T"
  cat /proc/$1/cmdline; echo
  printf "T:%-16s %-13s %13s\n" Total Current Average
  while true; do
    readarray -t line < /proc/$1/io
    for i in "${line[@]}"; do
      t=( $i )
      io[${t[0]}]=${t[1]}
    done
    r1="$r2"
    w1="$w2"
    t1="$t2"
    r2="${io[rchar:]}"
    w2="${io[wchar:]}"
    : ${r0:=$r2}
    : ${w0:=$w2}
    printf -v t2 "%(%s)T"
    dt0=$(( t2-t0 )); dt0=$(( dt0 <= 0 ? 1: dt0 ))
    dt1="${OPT_INTERVAL:-1}"
    printf "R:%'16d %'13d %'13d\n" "$r2" $(( (r2-r1)/dt1 )) $(( (r2-r0)/dt0 ))
    printf "W:%'16d %'13d %'13d\n" "$w2" $(( (w2-w1)/dt1 )) $(( (w2-w0)/dt0 ))
    printf "\e[2A" # Cursor Up 2
    sleep "${OPT_INTERVAL:-1}"
  done
}

invoke_command "$@"