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January 2019

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[opensuse-factory] Re: [opensuse-science] openMPI mixup in Tumbleweed/Leap 15.x
by Stefan Brüns 03 Jan '19

03 Jan '19

On Mittwoch, 2. Januar 2019 22:36:52 CET Egbert Eich wrote: > Stefan Brüns writes: > > Several programs will end up with implicitly linking to both versions, as > > libnetcdf and hdf5 use openmpi1 and boost_mpi uses openmpi2. One example > > is > > vtk. > > This would be a nightmare. > As I've stated elsewhere already, I believe it would be better if > packages that are used by the 'naive' user - and especially their > dependencies - should stay away from using any MPI. > I don't see the benefit of MPI if you do not specifically set it > up for your task. I will have to look at vtk - tomorrow probably. The "serial" flavor, both in science and Factory, is ok now. The openmpi(1) flavor is somewhat broken, as the dependency set for both openmpi1 and openmpi2 is imcomplete: Only available as openmpi1: - libnetcdf-openmpi, python3-mpi4py Only available as openmpi2: - boost_mpi So we have to fixup the dependencies first. I have converted vtk to a multibuild package, see https://build.opensuse.org/ package/show/home:StefanBruens:branches:science/vtk [...] > > Question now, which version to choose? > > > > Apparently, openmpi2 does not work on all architectures (PPC, PPC64BE) > > [1], > > and is not supported by some software packages [2]. > > > > Are there any drawbacks for using openmpi1 everywhere in TW/Leap 15.x? > > Besides the fact that it is unmaintained? We do not provide or support it > any more on SLE-15. Right now, openmpi2 is supported there, meaning that > all openmpi2 packages on Leap 15(.0) will have the benefit of receiving > all the bug fixes we add to SLE. As openmpi2 is seems to available on all supported platforms (even PPC64BE since 2.1.4, science has 2.1.5), it should be a good default for everything not buildable with multiple flavors - probably only python. For vtk, this would mean adding an openmpi2 flavor to netcdf, and switching mpi4py to openmpi2. Kind regards, Stefan -- Stefan Brüns / Bergstraße 21 / 52062 Aachen home: +49 241 53809034 mobile: +49 151 50412019

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