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A dual core processor looks just like two single core processors to Linux (this is really all it is). A SMP kernel should just detect two processors automatically, but if you want to be sure just cat /proc/cpuinfo and make sure that there are two processor entries. If there are, then the system will use them both. Be aware that unless a program is specially written to use multiple threads, it will only run on one processor, but the kernel can run two single threaded programs at once (one on each processor core).
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