topic Hi Khang, in Intel® oneAPI Math Kernel Library

MKL FFT Error in Example Code in Linux

Giri_Ajay__Adhyanth — Mon, 15 Jul 2019 15:43:45 GMT

Hello!
I was trying to learn about the MKL FFT libraries and wanted to check how the example programs ran, but when I check the output files, it says there is an error, status = 2 while trying to create the descriptor for a 1D array with Double Precision.

I'm attaching the example code (basic_dp_complex_dft_1d.f90) and my executable link (link1.txt - might have to use chmod 700) for the example code. Not sure if I am linking the program properly or not.

I am not able to figure out if I am wrong in the executable link file - which I had used from the MKL Link Advisor - or if the MKL is installed properly. Could you please help me out with why I am not able to get the proper output for the example code?

Thanks!

You used the library libmkl

mecej4 — Tue, 16 Jul 2019 02:35:16 GMT

You used the library libmkl_intel_ilp64.a -- note that ILP64 libraries are appropriate only if integer arguments being passed to MKL libraries are 8-byte integers. You should probably use an LP64 library. Alternatively, if you do use 8-byte integer arguments, specify the appropriate compiler flag for treating default integers as 8-byte integers.

Hi Adhyanth,

Khang_N_Intel — Thu, 18 Jul 2019 22:33:49 GMT

Hi Adhyanth,

I guess that mecej4 did solve your problem, right?

Thanks,

Khang

Hi Khang,

Giri_Ajay__Adhyanth — Fri, 19 Jul 2019 00:05:10 GMT

Hi Khang,

Yes. mecej4 did solve my issue.

Thanks for checking the thread though.

- Adhyanth

Hi Adhyanth,

Khang_N_Intel — Fri, 19 Jul 2019 16:51:19 GMT

Hi Adhyanth,

I am glad to hear that mecej4 was able to fix your issue. mecej4 is an Intel(R) MKL expert.

Please do not hesitate to contact us directly or indirectly should you have any questions relating to Intel(R) MKL.

Best,

Khang

Hi Khang,

Giri_Ajay__Adhyanth — Tue, 06 Aug 2019 17:17:32 GMT

Hi Khang,

I have a query, which I hope you could help me with. I am currently working on using MKL's FFT for a 2D grid with discrete grid points.

I am able to generate good results when the number of grid points is less than a certain value. Anything above that leads to practically impossible results.

Is it because MKL FFT has a limitation in this aspect? Because I tried the same code with FFTW, but I was not getting any such errors.

Any help would be appreciated.

Regards!

- Adhyanth