Hi,
I have searched through Google and maling lists, and couldn't find a
good script that adjusts cpu frequency with respect to cpu
temperature (there are different approaches as far as i see).
This is very important for notebooks, and generally cooling problem
arises once a script (especially compiling process) uses cpus for
along time. In other words, this small script helps your notebook to
live longer (hopefully).
How to use:
1- According to number of cpus, add/remove temp{0} lines. Below one
is for core duo cpu and it checks temperature of both core. I would
first test value of 'envstat | grep cpu0 | cut -d \ -f 9 | cut -b
1,2' command to make sure it gives the temperature of the core 0.
2- Check your supported frequncies by 'sysctl -a | grep
machdep.est.frequency.available' command...
3- Add/remove and adjust elif/then sections according to your cpu
frequncies supported and desired temperature levels. Below one ie;
reduces frequency to 1400 MHz once temperature is higher than 60 C
degree and below 65 C degree.
4- Create a crontab and run the script every ie; 5 mins.
#######################################
#!/bin/sh
temp0=`envstat | grep cpu0 | cut -d \ -f 9 | cut -b 1,2`
temp1=`envstat | grep cpu1 | cut -d \ -f 9 | cut -b 1,2`
if [ ${temp0} -gt 65 ] || [ ${temp1} -gt 65 ];
then sysctl -w machdep.est.frequency.target=1200
elif [ ${temp0} -gt 60 ] || [ ${temp1} -gt 60 ];
then sysctl -w machdep.est.frequency.target=1400
elif [ ${temp0} -gt 55 ] || [ ${temp1} -gt 55 ];
then sysctl -w machdep.est.frequency.target=1600
elif [ ${temp0} -gt 50 ] || [ ${temp1} -gt 50 ];
then sysctl -w machdep.est.frequency.target=1800
elif [ ${temp0} -gt 45 ] || [ ${temp1} -gt 45 ];
then sysctl -w machdep.est.frequency.target=2000
elif [ ${temp0} -gt 40 ] || [ ${temp1} -gt 40 ];
then sysctl -w machdep.est.frequency.target=2200
else
fi
#######################################
Use at your own risk of course.
Best regards,
Cem