Author: Robert Hyatt
Date: 07:39:35 08/14/01
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On August 14, 2001 at 00:44:43, Slater Wold wrote: >Oh, and like the MS clip said, there are programs that when run under Windows 98 >or ME will USE a 2nd CPU. But they are not going through the OS. CAD and even >the deep programs will use a 2nd CPU under Windows 98 and ME. However, 40 print >jobs on a 8x700 running Windows ME will only use 1 CPU. > >I think I am preaching to the choir there though. > > >Slate The "deep" programs won't use the second cpu. Everyone is using some form of "threads" which requires O/S support to schedule them on the second cpu. Since the O/S is no aware of the second processor, it won't schedule a thread on them ever. It would be up to a very clever programmer to disable interrupts, then set the APIC up so that the second cpu never gets an interrupt, and never does anything that would cause I/O to happen, and then use it to do the search. I don't think you will find many programs that will _ever_ use that second processor because the code would be highly platform-specific. Different motherboards handle SMP differently and the engine would have to know about all of that. Not likely nor practical. Which is why we want O/S thread support.
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