schedulers.sh

#!/bin/bash

# Analyze your schedulers. Don't use this. 2nasty4u
# Usage: $0 [sda sdb ...] | tee -a schedulers.csv

devs=$*
for dev in $devs; do
    # Save the current scheduler
    active_scheduler=`cat /sys/block/$dev/queue/scheduler | grep -Eo '\[[a-z]+\]' | sed 's/\[//g' | sed 's/\]//g'`
    for scheduler in `cat /sys/block/$dev/queue/scheduler | sed 's/\[//g' | sed 's/\]//g'`; do
        echo $scheduler > /sys/block/$dev/queue/scheduler
        for i in `seq 1 10`; do
          rate=`hdparm -t /dev/$dev | awk -F' =  ' '{print $2}' | grep -vE '^$'`
          echo "$dev,$scheduler,$rate"
        done
    done
    # Restore the original scheduler
    echo $active_scheduler > /sys/block/$dev/queue/scheduler
done