Sorry, I seem to have misread your post. You're not actually invoking
MPI_Alltoall or MPI_Alltoallv. Please disregard my last post.
Simon.
On 26/04/2013 23:14, Stephan Wolf wrote:
Hi,
I have encountered really bad performance when all the nodes send data
to all the other nodes. I use Isen
This sounds a bit like the All_to_allv algorithm change I complained
about when 1.6.1 was released.
Original post:
http://www.open-mpi.org/community/lists/users/2012/11/20722.php
Everything waits for "rank 0" observation:
http://www.open-mpi.org/community/lists/users/2013/01/21219.php
Does s
Hi,
hast du das Problem nur mit OpenMPI oder auch mit anderen MPI Bibliotheken
(z.B. MPICH2)
Ansonsten kannst du auch mal probieren, ob du das All-to-all mit Collectives
hin bekommst, z.B. Scatter oder Gatter.
Viele Grüße
Sebastian
> Hi,
>
> I have encountered really bad performance when all
If you use only non-blocking communications I don't see how the behavior you
describe can happen in the code of Open MPI. There might be something else
going on there.
George.
On Apr 27, 2013, at 00:14 , Stephan Wolf wrote:
> Hi,
>
> I have encountered really bad performance when all the n
