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I want to know how can i find number of cpu cores/processor supported given i have the MIPS value?

For e.g I want to know the number of matching cores/processor to process speed of 18 triilion instructions / sec.

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This will depend on the speed of the cores/processors. Then use division. –  Dave Clarke Oct 17 '12 at 9:26
    
can we measure / predict speed based on matches per second measurement? like in DB case please read my replies below –  asadz Oct 17 '12 at 17:34
    
It seems that you have a specific application in mind. Please add some details of this application by editing your question. 18 trln. is a lot. For any nontrivial application ensuring scalability across thousands of cores would be a challenge in itself. –  Dmitri Chubarov Oct 18 '12 at 5:09
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1 Answer 1

For a modern CPU there is no exact MIPS rating since it depends on the specific instruction stream, power saving mode, and other factors. As a reference number you may look at the BogoMIPS rating that is calculated by the Linux kernel.

A desktop CPU core at 3GHz can process about 2 instructions per clock cycle on average resulting in a rating close to 6000 MIPS (or 6 billion instructions per second), therefore 18 trillion instructions would require about 3000 cores.

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So if i read you correct 3000 cores running at 3Ghz would perform 18 trillion instructions per second. What is 1 unit relationship e.g 1 core= how many instructions? –  asadz Oct 17 '12 at 13:05
    
So in this case the number of cores are dependent upon speed and # of instructions per processor. This number can never be fixed? Is 3000 cores reasonable talking about which hardware manufacture does this. –  asadz Oct 17 '12 at 16:00
    
@if i have the value for number of matches per second in terms of DB can it help me get approx val for processor speed? –  asadz Oct 17 '12 at 16:04
    
@user970533 3000 cores can be found in a compute cluster or a compute farm (3000 cores ~ 100-400 dual processor nodes). Large database machines from leading manufacturers have 20 to 50 times smaller core count. –  Dmitri Chubarov Oct 18 '12 at 8:00
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