Hello,
I am studying the optimization strategy when the number of communication
functions in a code
is high.
My courses on MPI say two things for optimization which are contradictory :
1*) You have to use temporary message copy to allow non-blocking sending
and uncouple the sending and receiving
I guess you need to provide buffers of char type to
MPI_Send and MPI_Recv, not NULL.
On Mar 16, 2014, at 8:04 PM, Elias Rudberg wrote:
> Hi Ralph,
>
> Thanks for the quick answer!
>
>> Try running the "ring" program in our example directory and see if that works
>
> I just did this, and it wo
Hi Ralph,
Thanks for the quick answer!
Try running the "ring" program in our example directory and see if that works
I just did this, and it works. (I ran ring_c.c)
Looking in your ring_c.c code, I see that it is quite similar to my
test program but one thing that differs is the datatype:
Try running the "ring" program in our example directory and see if that works
On Mar 16, 2014, at 4:26 PM, Elias Rudberg wrote:
> Hello!
>
> I would like to report a bug in Open MPI 1.7.4 when compiled with
> --enable-mpi-thread-multiple.
>
> The bug can be reproduced with the following test
Hello!
I would like to report a bug in Open MPI 1.7.4 when compiled with
--enable-mpi-thread-multiple.
The bug can be reproduced with the following test program (mpi-send-recv.c):
===
#include
#include
int main() {
MPI_Init(NULL, NULL);
int rank;
If you are running on a Slurm-managed cluster, it won't be happy without
configuring --with-slurm - you won't see the allocation, for one.
Is it just the --with-slurm option that causes the problem? In other words, if
you remove the rest of those options (starting --with-hcoll and going down tha
Hi Jeff, Hi Ake,
removing --with-slurm and keeping --with-hcoll seems to work. The error
disappears at compile time, I have not yet tried to run a job. I can copy
config.log and the make.log is needed.
Cheers,
F
On Mar 11, 2014, at 4:48 PM, Jeff Squyres (jsquyres) wrote:
> On Mar 11, 2014, at
On Mar 16, 2014, at 12:16 AM, Jianyu Liu wrote:
> Thanks for your kindly input
>
> More further questions
>
> 1. How to check and change the ordering of network interfaces, such as tcp,
> ib, etc., in the kernel?
Heck if I know - does it matter? If you want to use a specific one, just tel
Thanks for your kindly input
More further questions
1. How to check and change the ordering of network interfaces, such as tcp,
ib, etc., in the kernel?
2. One of my applications only can run with "--mca btl tcp,self", otherwise
aborted without specific error messages, even if run on sin
