set the speed of your CPU to a fixed frequency. This makes benchmarkes much more reproducible.

gistfile1.txt

#!/bin/sh

if [ "$1" = "ondemand" ]; then
  echo "setting cpu governer ONDEMAND"
	for f in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor 
	do 
		echo ondemand> "$f" 
	done
	exit
else
	for f in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor 
	do 
		echo userspace > "$f" 
	done
fi

for f in /sys/devices/system/cpu/cpu*/cpufreq/scaling_setspeed
do
        echo $1 
	echo $1 > "$f"
done

echo 'all CPU cores set to speed'
 
for f in /sys/devices/system/cpu/cpu*/cpufreq/scaling_cur_freq
do 
	cat "$f"
done