Disk benchmarking using dd

ddbench.sh

#!/usr/bin/bash
set -eo pipefail

if [[ $1 =~ (-h|--help) ]]; then
	echo "Usage: $0 [file on mounted drive]"
	exit 1
fi

tmpfile=${1:-$(mktemp)}
echo "I/O with $tmpfile will be performed..."

echo
echo "Write:"
dd if=/dev/zero of=$tmpfile bs=1M count=1024 conv=fdatasync,notrunc status=progress

echo 3 | sudo tee /proc/sys/vm/drop_caches > /dev/null

echo
echo "Read:"
dd if=$tmpfile of=/dev/null bs=1M count=1024 status=progress

echo
echo "Cached read:"
dd if=$tmpfile of=/dev/null bs=1M count=1024 status=progress