diskio

#!/bin/bash

# usage:
#   qlogin -l interactive=true -pe batch 16
#   ./diskio

# while the write speeds will display almost immediately, the read
# speeds will take several 10s of minutes due to clearing the cache

# note that the product of bs=1M and count=256K on line 45 must equal or exceed total RAM

# qsub -l gpu=true -pe batch 7 -N diskio -j y -b y -V -shell n -o ${PWD}/diskio.570.log ${PWD}/diskio

date
hostname

set -e

write_it() {
  echo $1
  dd if=/dev/zero of=$1 bs=1M count=30 conv=fsync; }

read_it() {
 echo $1
 dd of=/dev/null if=$1 bs=1M; }

echo write
write_it /dev/shm/${HOSTNAME}0
write_it /scratch/$USER/${HOSTNAME}1
write_it /nobackup/mousebrainmicro/${HOSTNAME}2
write_it /groups/mousebrainmicro/mousebrainmicro/${HOSTNAME}3
write_it /tier2/mousebrainmicro/${HOSTNAME}4

# clear cache
# the slow way which doesn't require root access
dd if=/dev/zero of=/scratch/$USER/bar bs=1M count=256K conv=fsync &> /dev/null
rm /scratch/$USER/bar
# purportedly this is ideal
# echo 1 > /proc/sys/vm/drop_caches

echo read
read_it /dev/shm/${HOSTNAME}0
read_it /scratch/$USER/${HOSTNAME}1
read_it /nobackup/mousebrainmicro/${HOSTNAME}2
read_it /groups/mousebrainmicro/mousebrainmicro/${HOSTNAME}3
read_it /tier2/mousebrainmicro/${HOSTNAME}4

rm /dev/shm/${HOSTNAME}0
rm /scratch/$USER/${HOSTNAME}1
rm /nobackup/mousebrainmicro/${HOSTNAME}2
rm /groups/mousebrainmicro/mousebrainmicro/${HOSTNAME}3
rm /tier2/mousebrainmicro/${HOSTNAME}4