[Cado-nfs-discuss] Linear Algebra with MPI

Emmanuel Thomé Emmanuel.Thome at inria.fr
Thu Jun 25 10:35:22 CEST 2015


Alex,

Did that work eventually ?

E.

On Mon, Jun 22, 2015 at 09:40:51PM +0200, Emmanuel Thomé wrote:
> Hi,
> 
> On Mon, Jun 22, 2015 at 12:44:36PM -0400, Alex Liao wrote:
> > Inconsistency -- exactly 4 == 2 * 2 MPI jobs are needed -- got 1
> 
> This means that the binaries you are running are unaware of the existence
> of other MPI jobs. Most often, this is caused by the fact that you're
> trying to go MPI with a non-MPI build.
> 
> > Any insight would be much appreciated. I'm using the version of CADO
> > pulled from the git repo and compiled using "MPI=/home/alexliao/.openmpi"
> > (OpenMPI 1.8.6)
> 
> Most probably you haven't. Note that the build directory (by default
> $PWD/cado/`hostname`) is not by default dependent on the $MPI variable,
> nor are its contents. So if you do a plain "make" to start with, and
> later try an MPI build with the command
> "MPI=$HOME/packages/openmpi-1.8.6/ make" (no other syntax), then you'll
> be screwed because the build directory is without MPI, and object files
> won't get rebuilt.
> 
> There are several ways to work around this quirk, choosing which way to
> go it is a matter of taste. You may want to force a fresh MPI build,
> as follows:
> 
> rm -rf build/
> MPI=$HOME/packages/openmpi-1.8.6/ make
> 
> You may also have local.sh decide on the build tree location based on
> some influential env. variables. These are excerpts of what I have in my own local.sh:
> 
>     build_tree="${up_path}build/`hostname | cut -d. -f1 | sed -e 's/-[0-9]*$//'`"
>     if [ "$MPI" ] ; then
>         build_tree="${build_tree}.mpi"
>         case "$MPI" in
>             *mvapich2*) build_tree="${build_tree}.mvapich2";;
>             *openmpi*) build_tree="${build_tree}.openmpi";;
>         esac
>     fi
>     if [ "$DEBUG" ] ; then
>         build_tree="${build_tree}.debug"
>         # Dangerous pitfall -- mpicc has the nasty habit of forcing -O2 !
>         export CFLAGS="-O0 -g"
>         export CXXFLAGS="-O0 -g"
>     fi
> 
> 
> If you can't fix your problem, please post the output of
> "MPI=/home/alexliao/.openmpi make cmake"
> 
> 
> Regards,
> 
> E.
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