topic Accessing the LU factors in sparse direct solver in Intel® oneAPI Math Kernel Library

Accessing the LU factors in sparse direct solver

nedialk — Thu, 06 May 2021 19:58:25 GMT

Hi,

I am trying to access the LU factors after dss_factor_real. Are there functions that can access them, along with the permutations?

Many thanks,

Ned

Re: Accessing the LU factors in sparse direct solver

Kirill_V_Intel — Fri, 07 May 2021 00:49:13 GMT

Hello Ned!

1) I recommend to stop using DSS API. Please switch to PARDISO API unless you're using the feature of computing the determinant.

2) There are no functions at the moment for PARDISO API which can return LU factors and permutations. We had requests for it but so far the priorities were different. You can submit a feature request to strengthen request for this feature.

3) We have the functions you want for the cluster sparse solver (which does the same operation at high-level as PARDISO but uses MPI/OpenMP parallelism [and you can run it on a single MPI]). Pease refer to the documentation for the cluster_sparse_solver_export() https://software.intel.com/content/www/us/en/develop/documentation/onemkl-developer-reference-c/top/sparse-solver-routines/parallel-direct-sparse-solver-for-clusters-interface/cluster-sparse-solver-export.html and an knowledge base article https://software.intel.com/content/www/us/en/develop/articles/export-functionality-in-the-cluster-sparse-solver.html.

Let us know if you have further questions.

Best,
Kirill

Re:Accessing the LU factors in sparse direct solver

Gennady_F_Intel — Fri, 07 May 2021 03:03:58 GMT

here is the link to the forum thread where the similar LU related questions has been discussed recently:

https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/MKL-PARDISO-get-L-U-factors/m-p/1265720#M31046

Re: Accessing the LU factors in sparse direct solver

MRajesh_intel — Fri, 18 Jun 2021 12:29:02 GMT

Hi,

Please let us know did the above mentioned link helped you and is there any more information that you would like to know?

Regards

Rajesh.

Re:Accessing the LU factors in sparse direct solver

Gennady_F_Intel — Mon, 12 Jul 2021 03:56:22 GMT

The issue is closing and we will no longer respond to this thread. If you require additional assistance from Intel, please start a new thread. Any further interaction in this thread will be considered community only.