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GNU scientific lib : gsl_blas_dcopy vs gsl_vector_memcpy

I am using the GNU scientific library and I was wondering what was the differences between those two function to copy a vector to another : gsl_blas_dcopy and gsl_vector_memcpy

do you have any idea which one would be the fastest ?

Solution

  • In the GSL manual, section 8.3.6, it says

    However, it is useful to have a small number of utility functions which do not require the full blas code. The following functions fall into this category.

    int gsl_vector_memcpy

    So both are basically the same. If you already need BLAS functionality, use gsl_blas_dcopy.

    Rumors say a BLAS implementation for you specific CPU might be the fastest.