Search found 203 matches

by fletchjp
Thu Aug 13, 2015 7:12 pm
Forum: User discussion
Topic: Help please to get CUDA 6.5 working on Ubuntu 12.04
Replies: 3
Views: 1440

Re: Help please to get CUDA 6.5 working on Ubuntu 12.04

It would help me very much if anyone with relevant experience could reply on this one. I tried an update using methods I had used before and the graphics collapsed completely because the correct module was not in place for the kernel. I was able to log in from another computer and back out of the ch...
by fletchjp
Thu Aug 13, 2015 7:09 pm
Forum: User discussion
Topic: MAGMA problem in HiPLARb
Replies: 4
Views: 3095

Re: MAGMA problem in HiPLARb

Is there a location which charts the changes in interface which have happened with different versions of Magma?

Thanks

John
by fletchjp
Mon Aug 03, 2015 11:22 am
Forum: User discussion
Topic: Help please to get CUDA 6.5 working on Ubuntu 12.04
Replies: 3
Views: 1440

Help please to get CUDA 6.5 working on Ubuntu 12.04

I have the CUDA 6.5 installed but it needs an update of the NVIDIA drivers before it will work. I have tried once and it crashed the computer as it did not install the correct kernel module and graphics disappeared. Luckily I can log in remotely and used that to backtrack. I know it has been achieve...
by fletchjp
Mon Aug 03, 2015 11:13 am
Forum: User discussion
Topic: Magma version of BLAS routine ZSBMV
Replies: 4
Views: 1046

Re: Magma version of BLAS routine ZSBMV

Hartwig No, I have found the work around using a routine designed for banded diagonal matrix multiplication (which is what SB means). I put my sparse matrix data into a vector and shuffle the values to be multiplied from the original vector into a vector matching the sparse data. The GNU Scientific ...
by fletchjp
Mon Aug 03, 2015 9:42 am
Forum: User discussion
Topic: Magma version of BLAS routine ZSBMV
Replies: 4
Views: 1046

Re: Magma version of BLAS routine ZSBMV

Hartwig Yes, I do want to multiply a sparse matrix into a vector ( r = B q ). What I have done is copy the vector values to another vector so that my multiplication is now rr[i] = bb[i] * qq[i] which is now dense. I am using ZSBMV which is in BLAS but not I think in MagmaBlas. I have two cases, one ...
by fletchjp
Mon Aug 03, 2015 8:13 am
Forum: User discussion
Topic: Magma version of BLAS routine ZSBMV
Replies: 4
Views: 1046

Magma version of BLAS routine ZSBMV

I am working on an interim method of using sparse matrix techniques to solve some problems. I want to multiply r = B q and have the countb elements of B stored in b_sparse with indices in ibs and jbs . Using two extra vectors qq and rr indexed in the same way as b_sparse I can get the multiplication...
by fletchjp
Sun Aug 02, 2015 7:51 am
Forum: User discussion
Topic: Seeking advice on choice of sparse matrix format
Replies: 4
Views: 1980

Re: Seeking advice on choice of sparse matrix format

Hartwig Thank you for your message. I am running with two home computers, both with GTX 460 graphics cards. I bought these systems a few years ago to assist my colleague who does the serious calculations. As I am more or less retired now I have more time to work with them. The idea was that I can ru...
by fletchjp
Sat Aug 01, 2015 5:47 pm
Forum: User discussion
Topic: Seeking advice on choice of sparse matrix format
Replies: 4
Views: 1980

Re: Seeking advice on choice of sparse matrix format

Hartwig Thank you very much for the quick reply. Indeed, my 4000 by 4000 is just a small case, they get much bigger. I use this case for development. I don't see much advantage using Magma at that size, but it can then be used on larger cases. I think you have dealt with most of the things. There is...
by fletchjp
Sat Aug 01, 2015 3:55 pm
Forum: User discussion
Topic: Seeking advice on choice of sparse matrix format
Replies: 4
Views: 1980

Seeking advice on choice of sparse matrix format

I have two complex matrices A and B which are generated in memory in setting up a problem. For a case about 4000 square, A averages 850 elements per row and B has 16 elements per row. At present I store all the elements of both A and B and for B this is clearly wasteful. I need to do two operations ...
by fletchjp
Sat Aug 01, 2015 10:19 am
Forum: User discussion
Topic: magma_zgetrf_gpu choice of pivot type
Replies: 0
Views: 981

magma_zgetrf_gpu choice of pivot type

I have been using magma_zgetrf_gpu and magma_zgetrs_gpu to factorise a matrix and then apply it multiple times to different single vectors. Up until now the calls to magma_zgetrf_gpu and magma_zgetrs_gpu have all been in the same program unit, as is the case with the example testing_zgetrf_gpu_f.F90...