Hi Guys,
We have a very large executable written in C++, C, F77 and F90 (and we
use all of these compilers!). Our code compiles and links fine but when
we run it on our cluster (under PBSPro) we get the errors at the bottom
of the email.
I wondered if you guys could shed any light on this? S
There are 2 answers for this question.
1. If only some of the processes on a communicator are on the same
node, then the point-to-point communications generated by the
collective call between these processes will always use shared memory
(if shared memory is enabled).
2. If all processes in
I was asked by a user if the MPI allreduce recognizes when
process ids are situated on the same node so that the communication
can then proceed over shared memory rather over the slower networking
communication channels.
Would anyone of the openmpi developers be able to comment on
that question
