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Fortran Array/Vector choice optimization

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Old   May 20, 2010, 17:50
Default Fortran Array/Vector choice optimization
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Hello everyone,

I want to ask a very basic question. Which one is faster(CPU),and economical (memory/RAM) reading a column of an array or directly a vector? Like I may create an array of size(5,n) or 5 vector of size(n).

Do you suggest which one? (and in what condition, like coarse/fine mesh, using always, or to read just in an "if statement")


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Old   May 21, 2010, 08:36
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On a serial machine probably the vector option will be faster, on a multiprocessor machine you can read your array columns in parallel! I suggest the use of MPI or OpenMP.

If you have a particular hardware in mind just implement a small test code and measure the time it needs to read a 5*n vector or a (n,5) array.

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