[Users] HDF5 Error, Hilbert
schnetter at cct.lsu.edu
Wed Oct 21 09:19:19 CDT 2015
On Wed, Oct 21, 2015 at 3:49 AM, Roland Haas <rhaas at aei.mpg.de> wrote:
> Hello all,
> > Glad to hear it's working!
> > The last line indicates that the threads are not being pinned to
> > specific cores. Usually, we recommend to pin them. You should be
> > able to do this by activating thorns hwloc and SystemTopology in your
> > parameter file.
> I suggest to also use your mpirun command's pinning options if
> available. This can be an issue since MPI will allocate memory before
> thorns hwloc and SystemTopology have a change of pinning the process so
> that you may end up with cores having to use memory that is physically
> attached to the "other" sockets in multi-socket systems.
> There is unfortunately nothing any thorn can do about this since MPI may
> allocate memory as soon as MPI_Init is called by the flesh.
We can introduce a mechanism by which a thorn can be called before MPI_Init
is called. This would call all thorns that are compiled in, since the
parameter file has not been read yet.
Erik Schnetter <schnetter at cct.lsu.edu>
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