If you want to decrease the CPU demands for an application you can use this very simple and somewhat ugly trick.
I use it when I convert videos on my MacBook Pro to prevent it from getting too warm. Even if the CPU is IDLE this hack will prevent the application to use the CPU during Sleep Time (in contrast to renice/nice commands which will take all IDLE time).
This means the conversions will take longer time, but I don't care because I run it at night. There is similar C program for Linux called cpulimit, but it wont compile on my Mac.
Note: To get the PID, run first the top -u command in one Terminal window.
Copy and paste the bash script (below) and save it in a text file (e.g cpulimitrob.sh).
Here's the bash script:
To make the file executable and run it type the commands (after going to the directory you saved the file to):
chmod 755 cpulimitrob.sh
sudo ./cpulimitrob.sh
[crarko adds: I haven't tested this one.]
I use it when I convert videos on my MacBook Pro to prevent it from getting too warm. Even if the CPU is IDLE this hack will prevent the application to use the CPU during Sleep Time (in contrast to renice/nice commands which will take all IDLE time).
This means the conversions will take longer time, but I don't care because I run it at night. There is similar C program for Linux called cpulimit, but it wont compile on my Mac.
Note: To get the PID, run first the top -u command in one Terminal window.
Copy and paste the bash script (below) and save it in a text file (e.g cpulimitrob.sh).
Here's the bash script:
#! /bin/bash # Description: # # If you want to decrease the CPU demands for an application # you can use this very simple and ugly "hack". # I use it when I convert videos on my MacBook Pro # to prevent it from getting to warm. Even if the CPU is IDLE this hack # will prevent the application to use the CPU during Sleep Time # (in contrast to renice/nice commands which will take all IDLE time). # This means the conversions will take longer time, but I # don't care because I run it at night. # # There is similar c program for Linux called cpulimit, but it wont # compile on my Mac. # # Usage: sudo ./cpulimitrob.sh # # Hint: To get the PID, run first top -u command in one Terminal window. # # echo "Which process ID (PID)? " read pid echo "Sleep time in seconds? " read sleeptime echo "Run time in seconds (e.g 0.5 or 1 …)? " read runtime i=1 dot=. while true do if [ $i -eq 1 ] then kill -SIGSTOP $pid sleep $sleeptime i=0 else kill -SIGCONT $pid sleep $runtime i=1 fi echo -n $dot done
chmod 755 cpulimitrob.sh
sudo ./cpulimitrob.sh
[crarko adds: I haven't tested this one.]
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