I'm running Prime 23.8.1 in Windows XP SP2, Pentium 4, 512 MB of memory.
In Windows Task Manager, when no other important programs are running, I see that Prime95.exe has 50% of the processor cycles, with 46% or so going to System Idle Process.
Is that optimal? Is it possible, or desirable, to increase the allocation of cycles to Prime95?
your P4 probably has hyperthreading (all the 800Mhz FSB ones, and the 3.03/533 ones are HT enabled). Hyperthreading makes 1 CPU bound job *look* like 50% because it *looks* like 2 CPUs, but you can't run two heavy floating point jobs concurrently or it will actually slow down. you CAN run 1 CPU bound FP job and then general purpose computing.
the catch is, that 2nd "CPU" is really only about 20% of one, but there's no real way the OS can know that.
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