Hi,
I am confused about the syntax of the "in place" variant of
MPI_Reduce, in particular about the significance of the recvbuf
for the non-root processes. I.e., is the following legal?
buf = (double *)malloc(l*sizeof(double);
random(buf, l); /* fill buf with something */
if (myid == 0) {
MPI_
Hi Vincent,
On Mon, Nov 09, 2009 at 11:45:29AM +0100, Vincent Loechner wrote:
>
> Martin,
>
> > I expect problems with sizes larger than 2^31-1, but these array sizes
> > are still much smaller.
> No, they are bigger, you allocate two arrays of 320 Mdouble :
> 2 * 320M * 8 = 5GB.
>
> Are your p
Hi Josh,
The OpenMPI version is 1.3.3.
The command ompi-ps doesn't work.
[root@compute-3-18 ~]# ompi-ps -j 2726959 -p 16241
[root@compute-3-18 ~]# ompi-ps -v -j 2726959 -p 16241
[compute-3-18.local:16254] orte_ps: Acquiring list of HNPs and setting
contact info into RML...
[root@compute-3-18
On Sun, 2009-11-08 at 20:40 -0800, Martin Siegert wrote:
> Hi,
>
> I am running into a problem with mpi_allreduce when large buffers
> are used. But does not appear to be unique for mpi_allreduce; it
> occurs with mpi_send/mpi_recv as well; program is attached.
> 1) run this using MPI_Allreduce:
Martin,
> I expect problems with sizes larger than 2^31-1, but these array sizes
> are still much smaller.
No, they are bigger, you allocate two arrays of 320 Mdouble :
2 * 320M * 8 = 5GB.
Are your processes limited to 4GB virtual memory ?
--Vincent
