Script (preferably Perl) to hog Linux CPU

Somebody in our local mailing list asked this and it also got my curious I decided to ask it as my first EE question:

How do I purposely hog CPU (in all cores) in a controlled manner? By controlled manner I mean hogging CPU by 70% only or 80%.  This means the script should actively monitor how much CPU it is burning and adjust its load generation accordingly.  Preferably done in Perl.

Any ideas/pointers?  Thanks
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this module may get you started
look at the load function
johanntagleAuthor Commented:
Thanks mwochnick.  I guess I can have a main process that fires up a subprocess that generates x% load, check on the CPU load, then fires up more subprocesses as needed.  But how do you make a process run on a specific core, so that we can have all cores run at say 70% ?
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you could create a process for each cpu and then pin each process to that cpu - here's an article on how to pin a process to a cpu - I think core's work the same as CPU's

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johanntagleAuthor Commented:
Thanks again mwochnick.  Turns out there's a non-Perl solution that does exactly what's needed - see  But I learned quite a few tricks from the links you gave.
johanntagleAuthor Commented:
Thanks again mwochnick.
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