Hi, I've written a BASH script to change CPU usage time according to CPU temperature. It can be found here: http://boinc.berkeley.edu/dev/forum_thread.php?id=9355
This is v0.01 - I could upload v0.1 somewhere if someones interested.

Having set this to update every two minutes this is running since a year now without problems. Sometimes i. e. when I play a flash video or a web site has many scripts temperature and thus fan speed still increases too much. Is it okay to set the update time to 1 second and usage change to 5% or will this f**k up my results?

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My reasons to participate in grid computing:
1. I'm using true renewable energy (German accreditation; no certificate purchasing)
2. Production and disposal (will) amount to about 95% of the energy "used" during the lifetime of my PC
3. Helping

Your tasks should be just fine. Different question is what BOINC will do if you change the CPU usage limit every second.

As you know BOINC does the throttling in 1+ second slices. For example, that 5% is 19 seconds off and 1 second on. Now, when you change the limit, does BOINC start with the on-cycle or off-cycle or does it continue the current cycle? It's possible you'll get BOINC either running all the time or not at all.

Interesting point. You say that it's possible that I could hit an on-cycle in every second. If nobody here can give me the answer then I guess this can only be figured out by studying source code or trial and error. I'll take the latter approach.

There's also the question if changing global_prefs_override.xml and running boinccmd --read_global_prefs_override will be fast enough. I'll try 3 seconds first.

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My reasons to participate in grid computing:
1. I'm using true renewable energy (German accreditation; no certificate purchasing)
2. Production and disposal (will) amount to about 95% of the energy "used" during the lifetime of my PC
3. Helping

I've set the interval of usage changes to 25 seconds and value of usage change to 4 %. This gives me quite stable output to the terminal.

Recent version and changes can be found here:
http://www.linuxquestions.org/questions/programming-9/bash-script-automatic-boinc-temperature-regulation-4175537439/

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My reasons to participate in grid computing:
1. I'm using true renewable energy (German accreditation; no certificate purchasing)
2. Production and disposal (will) amount to about 95% of the energy "used" during the lifetime of my PC
3. Helping