LAPACK(zsptrf), using Complex has no speed improvement comparing with Complex

Paul_W_1 — Fri, 21 Jul 2017 23:42:53 GMT

For function LAPACK(zsptrf) to solve matrix LU, if the matrix data type is Complex<float>, the speed should be faster than Complex<double>. But I did not see the improvement. I use the version mkl-10.3.9. Will the new version has this benefit? Newest version is mkl-11.2.2.

Thanks.

Hi Paul,

Zhen_Z_Intel — Tue, 25 Jul 2017 07:37:00 GMT

Hi Paul,

I test the performance for single precision just no much improvement which is similar to complex16. And this function is for packed format, the cost of this function probably not only calculation, but also need process to expend lower/upper part to the whole matrix. If you found obvious difference, could you please provide a test case with input matrix. We will check with it. Thanks.

Best regards,
Fiona

topic Hi Paul, in Intel® oneAPI Math Kernel Library

LAPACK(zsptrf), using Complex has no speed improvement comparing with Complex

Hi Paul,