Trivial disk troughput bench using dd(1)

ddbench.sh

#!/bin/sh

[ $# -lt 1 ] && echo "usage: $0 <path>" && exit 1

bpath=$1

# you might want to change these to suit your setup

bs=32k
count=30000

echo "running tests with bs=${bs}, counting ${count} cycles"

speedtest()
{
	t1="$(date +%s)"
	bytes=$($1 2>&1 && sync)
	t2=$(($(date +%s)-$t1))
	
	bytes=$(echo "${bytes}"|awk '/[0-9]+\ bytes/ {print $1}')
	
	mbps=$(($bytes / $t2 / 1024 / 1024))
	echo "${mbps}MB/s (${bytes} written in ${t2} seconds)"
}

echo -n "write speed... "

speedtest "dd if=/dev/zero of=$bpath bs=${bs} count=${count}"

echo -n "read speed... "

speedtest "dd if=$bpath of=/dev/null"

rm -f -- "$bpath"