Question about Parallel Programming

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nge

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Dear All,
I have a question about parallel programming. In some programming languages, we can do some part of the code to execute in parallel, but what I'm confusing is how these codes run on a processor (say, normal intel p4), time scheduling or what? thanks

nge
 

For program it is considered as execution on different processors. But actually, these processors are virtual - just simple time division. Let say, 1 ms real processor executes commands for first virtual processor, then 1 ms for second virtual, etc.

Also, there are some techniques, like HyperThreading from Intel, that can simultaneuosly execute 2 and more instructions for parallel threads on the same hardware processor. This approach can be applied only when these instructions from parallel threads require different resources of processor.
 

Hi,
Some times (as in SIMD) architecture the processor runs in Time division but appears parallel for all practical purposes. In some processors there are multiple execution units.
B R M
 

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