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Multi core processors

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I am running Windows 7 x64 on a server with a Haswell E5-1630v3 4 core processor. I am writing in Fortran 95 and using a recently purchased Intel x64 compiler. I have some questions:

1.  Should hyperthreading be on or off for best execution performance with a processing applications.

2.  Is there a compiler option to use all 4 cores when executing the application.

3.  I assume that the /QxHost compiler option will generate AVX-2 code.

 


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