Hi Guillermo,

I’ve had a go at building the Nektar++ master branch on Fedora 35 and it builds successfully without any problems. I’m using the same versions of mpi, cmake and gcc that you’ve listed below, in addition to the same blas and lapack packages.

There is, however, a problem building 5.0.3 with my configuration. I think the problem I’m seeing is because I’m using a version of boost that is not compatible with 5.0.3. I’m using the version installed from packages on Fedora 35 which is 1.76.0-5-fc35.

Just for your information, I built successfully by starting a fresh Fedora 35 container, run “yum update” and then install the following packages:

blas-devel boost-devel cmake gcc-c++ gcc-gfortran git lapack-devel libXmu-devel make scotch-devel tinyxml-devel zlib-devel openmpi-devel ptscotch-openmpi-devel

I then cloned Nektar++ from gitlab.nektar.info/nektar/nektar.git (in order to use the latest master branch rather than using an older source release), made a build directory and changed into it. Before running CMake, because Fedora 35 seems to put MPI in a non-standard location, you need to set some environment variables for CMake to find MPI:

export LD_LIBRARY_PATH=/usr/lib64/openmpi/lib:${LD_LIBRARY_PATH}
export LIBRARY_PATH=/usr/lib64/openmpi/lib:${LIBRARY_PATH}
export PATH=/usr/lib64/openmpi/bin:${PATH}
export PKG_CONFIG_PATH=/usr/lib64/openmpi/lib/pkgconfig:${PKG_CONFIG_PATH}

I was then able to configure successfully using CMake. I’m using the default settings but turning on MPI support.

cmake -DNEKTAR_USE_MPI=ON ..

I then ran make and the build completed successfully.

I suspect you may need to clear your build directory and rerun CMake if you’ve previously built v5.0.3 and are finding that the build is not working.

If you’re still having issues, can you send us the full CMake configuration that you’re using as well as confirming the version of Boost you have installed.

Thanks,

Jeremy

On 29 Mar 2023, at 22:52, Guillermo Suarez <guillermo180395@gmail.com> wrote:

Hi Jeremy,

Thank you for your reply.

To answer your questions:
- I get the exact same error for the master version.
- Before installing the dev version of Lapack etc, I was able to
install all nektar++ versions v5.X.X successfully.
- Regarding the mpi.h, I didn't do anything. Configured the project
with 'ccmake' and then just ran 'make'. It is strange that mpi.h was
not found even though cmake detected it. You can also see in the CMake
error file that there is an undefined reference to 'dgemm_', even
though I have Lapack/Blas installed and it was detected by cmake.

Please let me know if you require any additional file.

Kind regards,
Guillermo

On Wed, 2023-03-29 at 21:55 +0100, Jeremy Cohen wrote:
Hi Guillermo,

I haven’t had a chance to investigate this in any detail yet but I
note that you seem to be using Fedora 35 and a fairly out of date
source release of Nektar++ 5.0.3?

I seem to recall that there were some challenges building on Fedora
35 a little while ago which should be fixed in a more recent release.
Have you updated your system version in recent months or you have
previously built v5.0.3 on Fedora 35 successfully?

The error looks to be something related to a null pointer in one of
the unit test source files so I suspect this is not directly related
to Blas/Lapack - I could be wrong and would need to check in more
detail.

Just looking now in the CMake error file, I also note that it looks
like it can’t find mpi.h, although actually I would have though that
you couldn’t start building if that wasn’t resolved, so maybe you
resolved this before starting the build?

Best wishes,
Jeremy

On 29 Mar 2023, at 09:30, Guillermo Suárez <
guillermo180395@gmail.com> wrote:

This email from guillermo180395@gmail.com originates from outside
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Hi,

I have recently installed the development versions of Lapack and
Blas (along with some other libraries) on my local machine. I have
tried to rebuild nektar, without any modification to the make file,
and it failed because of different errors. I have also tried to
with a clean installation of the latest version, also without
success - same error. I could not manage to find the issue. I am
attaching the CMake log files as well as part of the screen output.

Some useful information:
mpirun (Open MPI) 4.1.1
cmake version 3.24.2
g++ (GCC) 11.3.1 20220421
Package lapack-devel-3.10.1-1.fc35.x86_64 is already installed.
Package lapack-3.10.1-1.fc35.x86_64 is already installed.
Package blas-devel-3.10.1-1.fc35.x86_64 is already installed.
Package blas-3.10.1-1.fc35.x86_64 is already installed.

Any help will be appreciated.

Thank you
Guillermo

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