#!/bin/sh

#testfile size.  At least 3 times the amount of RAM (hint: use 'mem=1G' Linux kernel boot parameter) and 10 times the amount of (cache in disk controler + cache integrated to  disks)
TSTFILE_SIZE='4g'

#run this at least one time to create the testfile and obtain a first set of results. Read 'iozone -h'

#sorting the results:
#grep '4194304    ' *result|perl -e 'while (<>) { ($name,undef,undef,$r,$w)=split(); print "$name est $r read, $w write\n"; $score{$name}=($r*10)+$w;} foreach $key (sort  { $score{$a} <=> $score{$b} } (keys(%score))) { print "$score{$key}\t$key\n";}'|less
#      ^^^^^^^ replace this your TSTFILE_SIZE expressed in bytes

docat()
{
  echo -en "$CAT":\ 
  cat $CAT | tr --delete '\n'
  echo
}

doCATMULT()
{
 for i in `find "$CATMULT" -type f` ; do 
   CAT=$i
   docat
 done
}

echo -n Read-ahead getra:\ 
sudo /sbin/blockdev --getra /dev/sda
echo -n Sector size getss:\ 
sudo /sbin/blockdev --getss /dev/sda
echo -n Block size getbsz:\ 
sudo /sbin/blockdev --getbsz /dev/sda

CATMULT=/sys/block/sda
doCATMULT

CATMULT=/proc/sys/vm
doCATMULT

CAT=/sys/block/sda/device/queue_depth
docat

cd /mnt/xfs
echo 3 > /proc/sys/vm/drop_caches
time ~/tmp/iozone3_283/src/current/iozone -f iozone.tmp -w -i2 -p -e -o -r64k -m -T -s $TSTFILE_SIZE -O -S 2048