I want to validate Allinea's profiler on the complete set of p2p and
collective routines available in MPI and went looking for examples of the
MPI_Neighbor routines in action. I can find a range of PDF tutorials and
papers, but no actual sample codes to try.
The OpenMPI examples for 1.8.4 don't us
t; Try using —map-by node:PE=N to your cmd line. I think the problem is that
> we default to —map-by numa if you just give cpus-per-proc and no mapping
> directive as we know that having threads that span multiple numa regions is
> bad for performance
>
>
> > On Dec 5, 2014, at 9:
lstopo is pretty!
John
Hi Ralph
I have a motherboard with 2 X6580 chips, each with 6 cores 2 way
hyperthreading, so /proc/cpuinfo reports 24 cores
Doing a pure compute OpenMP loop where I'd expect the number of iterations
in 10s to rise with number of threads
with gnu and mpich
OMP_NUM_THREADS=1 -n 1 : 112 iterations
O
To run a hybrid MPI/OpenMP code on a hyperthreaded machine with 24 virtual
cores, I've been using -n 12 --cpus-per-proc 2 so I can use
OMP_NUM_THREADS=2
I now see that --cpus-per-proc is deprecated in favour of --map-by, but
I've been struggling to find a conversion as the --map-by documentation i
end module MYMODULE
>
> !
>
> program fred
>
> use MYMODULE
> use mpi
> integer :: ierr
> call mpi_init(ierr)
> print *,"hello"
> call mpi_finalize(ierr)
> end program fred
>
>
>
>
>
> Greetings
>
> Michael Rachner
>
>
from an OpenMP region ?
>>> does your program calls MPI only within an !$OMP MASTER section ?
>>> does your program does not invoke MPI at all from any OpenMP region ?
>>>
>>> can you reproduce this issue with a simple fortran program ? or can you
>>> pub
process count suppresses
it are still a mystery
John
On 17 November 2014 16:41, John Bray wrote:
> I have succesfully been using OpenMPI 1.8.3 compiled with Intel-14, using
>
> ./configure --prefix=/usr/local/mpi/$(basename $PWD) --with-threads=posix
> --enable-mpi-thread-multiple --disab
I have succesfully been using OpenMPI 1.8.3 compiled with Intel-14, using
./configure --prefix=/usr/local/mpi/$(basename $PWD) --with-threads=posix
--enable-mpi-thread-multiple --disable-vt --with-scif=no
I have now switched to Intel 15.0.1, and configuring with the same options,
I get minor chan
