I'm not sure what you're shooting for.
Writing a perl script that will use 100% of 1 cpu is pretty simple:
perl -e'while(1) {$x++}'
pretty well does the job.
If you also need to exercise memory and paging, you could
have something like:
perl -e'$x=" " x 1024 x 1024 x 256; while(1) { $x=~s/ /./g; $x=~s/./ /
+g;}'
I haven't tested that last one, but I'll bet it'll be nicely anti-social :)
Are you shooting for something more precise, like 30% cpu load? That would be much harder to fine-tune...
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