Benchmarking or a "resources reducer" to use on arch linux

Helo pals....
Let me explain what I want.
I'm a folding at home entusiast, and, at this moment, I'm working with graysky's -ck kernel, liquorix kernel, trying to work with ice and pf ones (headers don't compiles with) and kernel rt
In a second time, the same kernels with NUMA, actually set to "off"
But, I'm looking for a resources reducer, or a benchmarking program that I could make "a load" on the system.
When I put to fold with a kernel, actually, I do it in idle, on normal using, and with "heavy processing", but I've some issues during heavy load:
I do it making some 20gb TAR files, using ark, but, when the files ends, it come back to idle... and, 20Gb uses more or less 20 minutes. 20 minutes is not enough to have a good idea about it.
I thought about compiling something during the folding, but it's not good too, cause if I receive some error during compiling, the system starts in a annoying mode (don't open something, or crash some applications) and I should restart
and, even compiling gives a "non linear" load...
I need to give the system a load about 30%, and/or 20 to 60% to do "real loading tests" could you help me?
arch linux running under 965BE, motherboard gigabyte 970A-D3, 12Gb RAM (2+2 4+4) with water cooler (antec kuhler 620A with 2 fans) and zogis 650Ti
PSU twice corsair VX550W

community/stress 1.0.4-3
    A tool that stress tests your system (CPU, memory, I/O, disks)
community/cpuburn 1.4a-3
    CPU testing utilities in optimized assembler for maximum loading of CPUs

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