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HOWTO: Stop Folding at Home Scaling My CPU
29/11/09
01:50:41 pm, by richard 
, 186 words 
Categories: Ubuntu Linux, OS and Systems Administration, Installation and Configuration
HOWTO: Stop Folding at Home Scaling My CPU
If you use the CPU scaling options that are now a default part of Ubuntu, you will also see that when folding@home runs or any other process that hits the CPU's hard the CPU frequency will jump up a level or two. Folding@home run as a low priority using nice. To stop any nice process from pushing the CPU to its limits add the following code snippet into the existing file /etc/init.d/ondemand. If will replace the start and background switch commands. I also want to set the minimum for my frequency for CPU too.
start)
log_daemon_msg "Setup cpu scalling" "ondemand"
log_daemon_msg " Sleeping for 60 seconds before continuing"
log_daemon_msg " Setting ondemand, ignore nice and min freq 1.5Ghz"
start-stop-daemon --start --background --exec /etc/init.d/ondemand -- background
;;
background)
sleep 60 # probably enough time for desktop login
for CPUFREQ in /sys/devices/system/cpu/cpu*/cpufreq
do
[ -f ${CPUFREQ}/scaling_governor ] && echo -n ondemand > ${CPUFREQ}/scaling_govenor
[ -f ${CPUFREQ}/ondemand/ignore_nice_load ] && \
echo 1 > ${CPUFREQ}/ondemand/ignore_nice_load
[ -f ${CPUFREQ}/scaling_min_freq ] && echo 1500000 > ${CPUFREQ}/scaling_min_freq
done
;;
log_daemon_msg "Setup cpu scalling" "ondemand"
log_daemon_msg " Sleeping for 60 seconds before continuing"
log_daemon_msg " Setting ondemand, ignore nice and min freq 1.5Ghz"
start-stop-daemon --start --background --exec /etc/init.d/ondemand -- background
;;
background)
sleep 60 # probably enough time for desktop login
for CPUFREQ in /sys/devices/system/cpu/cpu*/cpufreq
do
[ -f ${CPUFREQ}/scaling_governor ] && echo -n ondemand > ${CPUFREQ}/scaling_govenor
[ -f ${CPUFREQ}/ondemand/ignore_nice_load ] && \
echo 1 > ${CPUFREQ}/ondemand/ignore_nice_load
[ -f ${CPUFREQ}/scaling_min_freq ] && echo 1500000 > ${CPUFREQ}/scaling_min_freq
done
;;
Now whenever you boot the file that tells the CPU scaling to ignore nice processes will be set.
Ubuntu documentation on Installing Folding At Home
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