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- LAPACK(zsptrf), using Complex<float> has no speed improvement comparing with Complex<double>

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Paul_W_1

Beginner

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07-21-2017
04:42 PM

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LAPACK(zsptrf), using Complex<float> has no speed improvement comparing with Complex<double>

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.

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Zhen_Z_Intel

Employee

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07-25-2017
12:37 AM

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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

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