How I run perf tests repeatably with records of what I did

runtest.sh

#!/bin/bash

#Set Defaults
requests=${requests:=10}
threads=${threads:=1}
url=${url:=http://testserver/}

while getopts "r:t:u:h" Option
do
  case $Option in
    r  ) requests=$OPTARG;;
    t  ) threads=$OPTARG;;
    u  ) url=$OPTARG;;
    h  ) help=1;;
    *  ) echo "Unimplemented option chosen.";;
  esac
done

shift $(($OPTIND - 1))
if [ ${help:-0} -eq 1 ]; then
  echo "Test Runner"
  echo ""
  echo "-r num		Number of Requests"
  echo "-t num		Number of Threads"
  echo "-u url		Url to test"
  echo ""
  exit 1
fi

run=$(cat lastrun.txt)
((run+=1))

echo -n "Run Description: "
read description

mkdir $run

echo "Starting test run: $run" | tee -a $run/settings.txt
echo "Date:		$(date)" | tee -a $run/settings.txt
echo "Description:	$description" | tee -a $run/settings.txt
echo "Parameters:" | tee -a $run/settings.txt
echo "	Requests:	$requests" | tee -a $run/settings.txt
echo "	Threads:	$threads" | tee -a $run/settings.txt
echo "	Url:		$url" | tee -a $run/settings.txt
echo "" | tee -a $run/settings.txt

ssh root@testserver "service squid stop; rm -Rf /var/spool/squid/*; service squid start"
ab -n $requests -c $threads -e $run/data.csv -g $run/data.gnuplot $url | tee $run/ablog.txt
echo $run > lastrun.txt

git add lastrun.txt
git add $run
git commit -m "Executed run $run"
git push

Some nice features:

1. Uses apachebench (only a single url, but that's fine for an ad-hoc test)
2. Stores information about each test run in $run/settings.txt so I can go back and find out how many threads and requests i configured
3. Automatically generates a new number for each run
4. Adds and commits the results files into git and pushes, so I can plot them on my laptop easily
5. Multiple ways of specifying options:
   threads=20 ./runtest.sh
   ./runtest.sh -t 20

Please note that apachebench is useful for testing throughput and concurrency, but because it hits only a single url repeatedly it should be blazingly fast with a cache.
Also remember to re-initialise things inbetween tests, note that we restart squid between tests

Hope it helps someone