Search found 9 matches

by badlishah
Tue Sep 15, 2015 5:30 am
Forum: User discussion
Topic: Solving with multiple RHS
Replies: 8
Views: 3945

Re: Solving with multiple RHS

Hi Hartwig, I am trying to solve a partial differential equation, to be exact the inverse of the wave equation of some seismic data. All this while I am using a direct solver, however direct solvers take a lot of memory and do not capitalize on the GPU capabilities. That is my main motivation to exp...
by badlishah
Tue Sep 15, 2015 3:45 am
Forum: User discussion
Topic: Solving with multiple RHS
Replies: 8
Views: 3945

Re: Solving with multiple RHS

Hartwig, Thanks a lot. I don't get that error anymore. I am using magma_cbpcg and preconditioner set to none. However I am getting solver returned: not positive definite (SPD/HPD) (-203) error instead. I am checking the program whether data is read correctly or not.What would cause such error? cheer...
by badlishah
Mon Sep 14, 2015 11:10 pm
Forum: User discussion
Topic: Solving with multiple RHS
Replies: 8
Views: 3945

Re: Solving with multiple RHS

Hartwig, I have a little problem here. I may have missed something. I keep getting this error: error: only 1 RHS supported for this solver class . I am using GEMRES solver. my code snippet: loadAMatrix(&A_h, queue, argv[1]); loadData(&B_h, argv[2], argv[3], argv[4], A_h.num_rows, queue); magma_cmtra...
by badlishah
Fri Sep 11, 2015 3:12 am
Forum: User discussion
Topic: Solving with multiple RHS
Replies: 8
Views: 3945

Re: Solving with multiple RHS

Hartwig,

Thanks for the tip. I will try this out and post the observations here.

cheers,
Badlishah
by badlishah
Thu Sep 03, 2015 2:20 am
Forum: User discussion
Topic: Solving with multiple RHS
Replies: 8
Views: 3945

Solving with multiple RHS

Greetings, I am trying to get X for the AX=B type of problem. I have a large banded sparse matrix A (200k x 200k) of single precision complex numbers and multiple RHS as the sparse matrix B. At present I am using the Pardiso direct solver to do this. What would be the best approach to get the soluti...
by badlishah
Tue Sep 01, 2015 9:50 pm
Forum: User discussion
Topic: CSC To CSR Matrix Conversion
Replies: 5
Views: 2855

Re: CSC To CSR Matrix Conversion

Hartwig,

That worked well. Thanks a bundle.

cheers,
Badlishah
by badlishah
Tue Sep 01, 2015 5:48 am
Forum: User discussion
Topic: CSC To CSR Matrix Conversion
Replies: 5
Views: 2855

Re: CSC To CSR Matrix Conversion

Thank you Mark. That tip was very helpful. Apologies for my ignorance, I am still new in this field :) How would I actually change the indices used in the matrix? For example in the CUDA CuSparse library there is the CUSPARSE_INDEX_BASE_ZERO and CUSPARSE_INDEX_BASE_ONE that can be used. Cheers, Badl...
by badlishah
Thu Aug 27, 2015 7:03 am
Forum: User discussion
Topic: CSC To CSR Matrix Conversion
Replies: 5
Views: 2855

CSC To CSR Matrix Conversion

Greetings,

Would there be simple way to convert vectors from a CSC matrix to the CSR format? Anyway I can manipulate the indexing?

cheers,
Badlishah
by badlishah
Thu Jul 09, 2015 12:08 am
Forum: User discussion
Topic: MAGMA Direct LU Solver
Replies: 0
Views: 977

MAGMA Direct LU Solver

Greetings, At present the project I am working on uses MUMPS as the direct LU solver. I am attempting to replace MUMPS with MAGMA. The matrix size can be as large as 200,000 x 200,000 in size. Iterative solvers so far may not produce accurate results. I have tried cuSolver but it does not provide co...