#!/bin/bash
basedir="/opt/sas/tmp"
lockfile="$basedir/cfsbench.lck"
bs="1M"
count="1000"

usage () {
  echo "Usage: $0 {server|client}"
  exit 1
}

case $1 in
  "clean")
    rm $basedir/cfsbench*.bin -vf
  ;;
  "server")
    echo "Dropping cache"
    sync ; echo 3 > /proc/sys/vm/drop_caches
    echo "Touching lockfile. Clients should start now."
    touch $lockfile
    watch 'df -h /opt/sas/tmp; ls -lh /opt/sas/tmp; echo "Press Ctrl+c to stop"'
    rm $lockfile -vf
  ;;

  "client-write")
    outfile="$basedir/cfsbench-$(hostname).bin"
    infile="/dev/zero"
    echo "Starting client"

    sync ; echo 3 > /proc/sys/vm/drop_caches
    while true; do
      sleep 0.1
      ls $basedir > /dev/null
      echo -n .
      [[ -f $lockfile ]] && sleep 3 && echo "Starting thread..." && dd if=$infile of=$outfile bs=$bs count=$count && time sync && exit 0
    done
  ;;

  "client-read")
    outfile="/dev/null"
    infile="$basedir/cfsbench-$(hostname).bin"
    echo "Starting client"

    sync ; echo 3 > /proc/sys/vm/drop_caches
    while true; do
      sleep 0.1
      ls $basedir > /dev/null
      echo -n .
      [[ -f $lockfile ]] && sleep 3 && echo "Starting thread..." && dd if=$infile of=$outfile bs=$bs count=$count && time sync && exit 0
    done
  ;;

  *)
    usage
  ;;
esac