CPU Balance

CPU Balance is a Perl script to balance the CPU usage among users. It will allocate CPU resource to each user equally only by the command renice, no matter how many processes/threads a user runs.

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# Basic Renice Goal
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1. User-based balance: every user get the same cpu percentage if they ask for more;
2. all the jobs of one user has the same NI;
3. NI of all jobs tend to move as large as possible when balanced;
4. No sudden change on NI. max change of NI of a proc <= 2. Only 1 user will be changed in a renice cycle.

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# Advanced Features
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1. gid/uid/cmd based renicable filter
2. gid/uid based weighted cpu division: priority & punished user support