Inconsistent results from Fortran programs on iMac 10.7.x and above

Inconsistent results from Fortran programs on iMac 10.7.x and above

Hi,

    I am having an annoying problem on iMac. The fortran programs was compiled with ifort 13 (also used -fp-model precise and -O3 ), the results from 10 runs are inconsistent.But running the same programs in a Macbook pro running 10.6.x are consistent.  It is really strange! I am not sure if I should blame Mac OSX or Intel compiler.

    Did anyone experience similar problem in Mac OSX 10.7 or above?

     Thanks

Cheers,

Lyndon.

 

 

 

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Para obter mais informações sobre otimizações de compiladores, consulte Aviso sobre otimizações.
imagem de Steve Lionel (Intel)

My guess would be that 10.7 is applying address space layout randomization. Try compiling with -align array32byte and see if things improve. See also the attached presentation.

Anexos: 

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Steve

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