MAGMA fallback on LAPACK implementation

[paoloviviani]

Hello,
I'm looking to make a code that relies to MAGMA portable to platforms without a GPU, is it possible to make MAGMA use the standard LAPACK implementation on which is built upon (e.g. OpenBLAS) if it does not find a GPU at runtime? I would like to underline that I'm forced to do that at runtime.
Thanks!
paolo

[mgates3]

This is not currently supported by MAGMA. It may be possible for some CPU-interface routines (where the input/output data is on the CPU, and the computation is hybrid CPU/GPU). For GPU-interface routines, this is obviously not possible, since the input/output data is on the GPU.

We will have to do some investigation. I'm not sure of the behavior of MAGMA when no GPU is installed.

-mark

[mgates3]

Attached is a demonstration of wrapping a MAGMA call. It's not very clean, as magma_init and magma_finalize don't currently work without a CUDA GPU, but it does work.
-mark

[paoloviviani]

Thanks a lot!
I'm trying to use Armadillo library to wrap Magma. I'll modify it following your example.
Thanks again,

Paolo