+ if uname -a | grep --silent arwin ; then
+ # clears cache on OS X
+ sudo purge
+ elif [ -f /proc/sys/vm/drop_caches ] ; then
+ # Linux cache clearing
+ echo 3 | sudo tee /proc/sys/vm/drop_caches >/dev/null
+ else
+ # need an alternative for other operating systems
+ :
+ fi
+
+ echo "# Blocksize $bs"
+ ./readtest $args -b $bs -q $dir/testfile_%d
+done