[petsc-users] Cuda: Vec and Mat types

[Junchao Zhang]

On Wed, Oct 27, 2021 at 2:24 PM Karthikeyan Chockalingam - STFC UKRI <
karthikeyan.chockalingam at stfc.ac.uk> wrote:

> Hello,
>
>
>
> I hope, I am framing the question currently.
>
> Are only distributed arrays (DMDA) of -vec_type and -mat_type only
> supported by CUDA?
>
I don't understand this question.  Currently, CUDA-capable types include
VECCUDA, MATAIJCUDA and MATDENSECUDA, either sequential or MPI.
>
>
>
> I am reading the petsc user manual in section 2.4 distributed arrays are
> introduced but at the start of chapter two there are other vector and
> matrix types as well. I wonder if these types (I don’t how they are
> referred by) are also CUDA supported?
>
>
>
> Can you please point me to some tutorial examples in KSP and SNES that can
> run on gpus?
>
search "-mat_type aijcusparse" or "-dm_mat_type aijcusparse" in petsc
tests/tutorials, you will find many.


>
>
> At the moment I am testing KSP/ex45.c with different preconditioners on
> cpus and gpus.
>
>
>
> I tried to run KSP/ex2.c with -vec_type cuda and -mat_type aijcuda noticed
> there was no gpu flops recorded in my log file.
>
It is -mat_type aijcusparse


>
>
> Many thanks,
>
> Karthik.
>
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