Hi all,
I am using openmpi@3.1.2 on an Ubuntu@16.04.5 box, how can I check if it
has CUDA support or not?
Best,
Andrei
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Andrei,
I generally check with one of these two:
$ ompi_info -a | grep "\-with\-cuda"
Configure command line: '--prefix=$HOME/ompi/build-cuda'
'--enable-mpirun-prefix-by-default' '--with-cuda=/usr/local/cuda'
'--with-ucx=$HOME/ucx-github/build'
'--with-ucx-libdir=$HOME/ucx-github/build/lib' '--
Thanks! I tried both and
ompi_info -a | grep "\-with\-cuda" returns nothing, while
ompi_info -a | grep "xtensions" returns
MPI extensions: affinity, cuda
It seems the two outputs are in conflict, what does that mean?
On Tue, Oct 30, 2018 at 8:50 PM Akshay Venkatesh
wrote:
> Andrei,
>
> I gener
The first one is the critical one. If the build was not configured
--with-cuda, then it's unlikely cuda-aware MPI is supported.
On Tue, Oct 30, 2018, 12:10 PM Andrei Berceanu
wrote:
> Thanks! I tried both and
> ompi_info -a | grep "\-with\-cuda" returns nothing, while
> ompi_info -a | grep "xten
In fact, I have "'--without-cuda":
Configure command line:
'--prefix=/home/andrei/src/spack/opt/spack/linux-ubuntu16.04-x86_64/gcc-7.3.0/openmpi-3.1.2-ocjvxwsaq3qfm6342xryaxgcesjnn4a6'
'--enable-shared' '--with-wrapper-ldflags=' '--enable-static'
'--without-pmi' '--enable-mpi-cxx'
'--with-zlib=/ho
The "Configure command line" shows you the command line that was given to
"configure" when building Open MPI.
The "MPI extensions" line just indicates which Open MPI "extensions" were built.
CUDA is one of the possible extensions that can get built.
The CUDA Open MPI extension is actually an AP
+1 to what Jeff said.
So you would need --with-cuda pointing to a cuda installation to have
cuda-awareness in OpenMPI.
On Tue, Oct 30, 2018 at 12:47 PM Jeff Squyres (jsquyres) via users <
users@lists.open-mpi.org> wrote:
> The "Configure command line" shows you the command line that was given to
Oh, I should clarify: that MPIX_Query_cuda_support() function is always present
in Open MPI -- even if you don't compile with CUDA support.
That's kinda the point / it's probably obvious, but I thought I would clarify,
anyway. :-)
> On Oct 30, 2018, at 4:29 PM, Akshay Venkatesh wrote:
>
> +
Thanks for the clarification, Jeff.
Andrei,
MPIX_Query_cuda_support indeed just returns the value of OPAL_CUDA_SUPPORT
which is set to one if configure included --with-cuda.
/* If CUDA-aware support is configured in, return 1. Otherwise, return 0.
* This API may be extended to return more featu
