#!/bin/bash

set_START() {
  START=`cat /proc/uptime | cut -d ' '  -f1`
}
get_ELAPS() {
  END=`cat /proc/uptime | cut -d ' '  -f1`
  ELAPS=`echo "scale=7; $END - $START" | bc`
}
	
make_dir() {
  echo "Gen $m Dirs"
  sync ; echo 3 > /proc/sys/vm/drop_caches
  set_START
  for i in `seq 1 $1`; do
    mkdir $i
  done
  get_ELAPS
  echo "make $1 dirs: $ELAPS sec"
}

touch_file() {
  sync ; echo 3 > /proc/sys/vm/drop_caches
  set_START
  for i in `seq 1 $2`; do
    touch $1/$i
  done
  get_ELAPS
  echo "touch $2 file: $ELAPS sec"
}

access_file() {
  sync ; echo 3 > /proc/sys/vm/drop_caches
  set_START
  ls -R > /dev/null
  get_ELAPS
  echo "access all files: $ELAPS sec"
}

remove_file() {
  sync ; echo 3 > /proc/sys/vm/drop_caches
  set_START
  rm -rf *
  get_ELAPS
  echo "remove all files: $ELAPS sec"
}

mkdir mnt

for k in ext4 xfs btrfs; do
  /sbin/mkfs.$k -F /dev/xvdb
  mount /dev/xvdb mnt
  cd mnt

  echo "Filesystem: $k start"
  for m in 16384 24576 ; do
    make_dir $m
    for n in 1 5 9 13; do
      touch_file $n 8192
    done
    access_file; remove_file

    make_dir $m
    for n in 1 13; do
      touch_file $n 16384
    done
    access_file; remove_file

    make_dir $m
    for n in 1 ; do
      touch_file $n 32768
    done
    access_file; remove_file
  done

  cd ..
  echo "Filesystem: $k end"
  umount mnt
done