topic adjust dcsrilu0 parameters in intel MKL. in Intel® oneAPI Math Kernel Library

adjust dcsrilu0 parameters in intel MKL.

sellountos__euripide — Sun, 21 Jan 2024 17:44:51 GMT

Hello,

In intel MKL dfgmres with ILUT preconditioner, i.e. dcsrilu0 is there any way to adjust the parameters : initial fill (lfil0) and initial drop (tol0)? I wanted to know if there's any way to adjust the preconditioner's dropping tolerances in order to converge with less iterations.

According to the documentation
https://www.intel.com/content/www/us/en/docs/onemkl/developer-reference-c/2024-0/dcsrilu0.html#GUID-E40E25D7-80D0-45FE-919C-F7DD969655E4

there's only option to adjust the diagonal

Thanks in advance.

Re:adjust dcsrilu0 parameters in intel MKL.

Mahan — Fri, 02 Feb 2024 02:39:27 GMT

Hi,

I would recommend to use dcsrilut instead of dcsrilu0 as it allows you to do ILU with a threshold. It has better performance but poorer sparsity.

Please follow the link for more details:

https://www.intel.com/content/www/us/en/docs/onemkl/developer-reference-c/2024-0/dcsrilut.html

Please let me know does this answer your query.

Re:adjust dcsrilu0 parameters in intel MKL.

Mahan — Thu, 08 Feb 2024 07:24:23 GMT

Please let me know if the above resolution answer your question.

Re: Re:adjust dcsrilu0 parameters in intel MKL.

sellountos__euripide — Sat, 10 Feb 2024 11:17:59 GMT

Hello,

Thanks for the answer. It resolved my problem.

Regards,