I have been experimenting with some simple fortran test programs to
write files with some of the MPI-IO functions, and have come across a
troubling issue. I use the function MPI_FILE_SET_VIEW with the 'native'
data representation and correctly write a file with MPI_FILE_WRITE_ALL.
However, if I ch
Don't forget that MPT has some optimizations OpenMPI may not have, as
"overriding" free(). This way, MPT can have a huge performance boost
if you're allocating and freeing memory, and the same happens if you
communicate often.
Matthieu
2010/12/21 Gilbert Grosdidier :
> Hi George,
> Thanks for yo
Hi George,
Thanks for your help. The bottom line is that the processes are
neatly placed on the nodes/cores,
as far as I can tell from the map :
[...]
Process OMPI jobid: [33285,1] Process rank: 4
Process OMPI jobid: [33285,1] Process rank: 5
Process OMPI jobid: [3328
hi,
when launching a parallel computation on 128 nodes using openib and the
"-mca btl_openib_receive_queues P,65536,256,192,128" option, i observe a
rather large memory consumption (2GB: 65336*256*128) on the process with
rank 0 (only).
this memory seems to be initialized and in use as the r
