Quick performance read/write comparison based on linux `dd`

benchmark.js

#!/bin/bash

BUFFERSIZE=1048576
WHERE="/dev/shm/test /mnt/data/test"
RESULTS="/tmp/benchmark_results.csv"

echo "WHERE;TYPE;SIZE;DURATION;SPEED;SPEEDUNIT" > $RESULTS

for i in `seq 1 10`;
do
    size=$(($i * 1024))
    echo "Testing $size MB files"
    for w in $WHERE;
    do
        echo "- Writing on $w"
        printf "$w;write;$size;" >> $RESULTS
        dd if=/dev/urandom of=$w bs=$BUFFERSIZE count=$size 2>&1 | awk '$2 == "bytes" {print $6";"$8";"$9 }' >> $RESULTS

        echo "- Reading $w"
        printf "$w;read;$size;" >> $RESULTS
        dd if=$w of=/dev/zero bs=$BUFFERSIZE 2>&1 | awk '$2 == "bytes" {print $6";"$8";"$9 }' >> $RESULTS

        echo "- Deleting $w"
        rm -f $w
    done
done