MAGMA Forum

magma_cgesv works on multiple GPUs; it calls magma_cgetrf, which calls magma_cgetrf_m. However, as you observe, the forward and back solves (getrs) are on the CPU. It's unclear if multi-GPU pivoting (laswp) and triangular solves (trsm) in getrs would benefit from the GPU, since there would be signif...

Yes, magma_dmalloc is just a wrapper around cudaMalloc. It is type-safe (you don't need to use sizeof(double) as you do with cudaMalloc), but otherwise nothing special going on. If you call asynchronous MAGMA routines that take a magma_queue, use the stream from the magma_queue to call CUDA function...

I'm not sure what you mean by "the arrays created by MAGMA routines". Do you mean arrays allocated by, say, magma_dmalloc? Yes, that's just a chunk of memory on the GPU, so you can process it equally well with MAGMA, cuBLAS, and your own custom CUDA kernels. It sounds like checking the coefficients ...

You need to have a Bitbucket account to post bug reports. I posted this there for tracking:
https://bitbucket.org/icl/magma/issues/ ... es-nans-on

-mark

Use magma_dgemm. It is simply a wrapper around cublasDgemm. magmablas_dgemm is MAGMA's own implementation, which dates back to the Fermi architecture. NVIDIA adapted this implementation for the cublasDgemm, and further optimized it. We keep the code around in case someone wants an open-source implem...

I think you are on the wrong forum. This forum is for MAGMA, the GPU library for linear algebra (http://icl.utk.edu/magma/). It sounds like you want MAGMA, the computational algebra system (http://magma.maths.usyd.edu.au/magma/).
-mark

Yes, unfortunately here the time gets rounded down. But the performance is reflected in the Gflop/s rate. You can compute the approximate time using the formula:

2/3 n^3 * batch_count / (gflop/s)

For instance

2/3 * 100^3 * 500 / 158.36e9 = 0.0021 sec.

-mark

MAGMA 1.0 is quite old, so I personally wouldn't bother. If you insist, there are MAGMA_VERSION_MAJOR, _MINOR, and _MICRO macros. See include/magma_types.h. clMAGMA is not actively maintained — even AMD's clBLAS is a couple years old at this point. clMAGMA uses HAVE_clAmdBlas or HAVE_clBLAS macros, ...

This forum is for the MAGMA linear algebra library for GPUs (http://icl.utk.edu/magma/). It doesn't solve polynomial equations. Perhaps you are intending the Magma Computational Algebra System (http://magma.maths.usyd.edu.au/magma/).
-mark

When using xlf, use -DNOCHANGE instead of -DADD_ in the make.inc file when compiling MAGMA. Then it will use the correct Fortran naming convention for IBM's Fortran. Ideally, the whole software stack — e.g., BLAS, LAPACK, MAGMA, your application — are compiled using the same set of compilers (e.g., ...