George,
I completely agree that the code I sent was a good example of what NOT to do
with collective and non-blocking communications, so I’m sending a better one.
1. I’m setting MPI_DATATYPE_NULL only on non-root processes. The root has a
real datatype. Why should both match when using MPI_IN_PLA
Pierre,
There are several issues with the code you provided.
1. You can’t use an MPI_DATATYPE_NULL as the send datatype, not even when count
is zero. At least the root must provide a real datatype. In fact the type
signature of the send message (datatype and count) should match the type
signatu
This program makes no sense and is wrong in multiple ways.
Jeff
On Thu, Nov 21, 2013 at 4:19 PM, Pierre Jolivet wrote:
> Hello,
> The following code doesn’t execute properly :
> #include
>
> int main(int argc, char** argv) {
> int taskid, ntasks;
> MPI_Init(&argc, &argv);
>
If you weren't able to join us at the Open MPI State of the Union BOF in Denver
at SC'13 this week, I've just posted the slides from the presentation:
http://www.open-mpi.org/papers/sc-2013/
--
Jeff Squyres
jsquy...@cisco.com
For corporate legal information go to:
http://www.cisco.com/web/
OOPS! I totally forgot to mention during the BOF presentation that the SC'13
overlords asked me to tell people to fill out a survey about the Open MPI BOF
at SC two days ago.
If you attended the BOF, please take 2 minutes to fill out a survey -- getting
a BOF slot is very, very competitive. G
Hello,
The following code doesn’t execute properly :
#include
int main(int argc, char** argv) {
int taskid, ntasks;
MPI_Init(&argc, &argv);
MPI_Request rq;
MPI_Comm_rank(MPI_COMM_WORLD,&taskid);
MPI_Comm_size(MPI_COMM_WORLD,&ntasks);
double* r;
int l = 0;
Hi,
I'm compiling the example code at the bottom of the following page that
illustrates MPI_Init_Thread():
http://mpi.deino.net/mpi_functions/mpi_init_thread.html
I have OpenMPI 1.7.3 installed on OSX 10.8.5 with --enable-thread-multiple
compiled with clang-425.0.28. I can reproduce t
