nk*4/wsize*4], 1, mpi_all_t,
A[rank*4/wsize*4], 1, mpi_all_t,
MPI_COMM_WORLD);
for(int i = 0; i < 4; i++) {
for (j = 0; j < 4; j++) {
printf("%6.2g")
}
printf("\n");
}
--
Spenser Gilliland
Computer Engineer
Doctoral Candidate
s
for your insight.
Thanks,
Spenser
--
Spenser Gilliland
Computer Engineer
Doctoral Candidate
ion using MPI derived datatypes with
* MPI collective communications.
*
* Author: Spenser Gilliland
*/
#include
#include
#include
#define N (8)
float matrix[N][N];
void print_matrix(int wrank, int wrows) {
int i , j;
MPI_Barrier(MPI_COMM_WORLD);
if(wrank == 0) printf(&qu
the local transpose it is altering the data that
the other processors sent it?
Thanks,
Spenser
--
Spenser Gilliland
Computer Engineer
Doctoral Candidate
d that process rank 1 with PID 9314 on node
jarvis.cs.iit.edu exited on signal 11 (Segmentation fault).
------
--
Spenser Gilliland
Computer Engineer
Doctoral Candidate
o that out of bound
> reads and writes will be obvious.
>
> Cheers,
>
> Matthieu
>
> 2014-05-08 21:16 GMT+02:00 Spenser Gilliland :
>> George & Mattheiu,
>>
>>> The Alltoall should only return when all data is sent and received on
>>> the curren
h means that the size is correct (using 4 byte floats with 2
processor on an 8x8 array this would be the 30th element).
There's a similar drawing to what you made attached that's more
focused on the specific instance in this code. Hopefully, this clears
up the algorithm a b
e specific? I
really want to get this working.
Thanks,
Spenser
--
Spenser Gilliland
Computer Engineer
Doctoral Candidate
5:43 PM, Spenser Gilliland
wrote:
> George,
>
>> The alltoall exchanges data from all nodes to all nodes, including the
>> local participant. So every participant will write the same amount of
>> data.
>
> Yes, I believe that is what my code is doing. However, I
Hi,
I'm having some trouble understanding Intercommunicators with
Collective Communication. Is there a collective routine to express a
transfer from all left process to all right processes? or vice versa?
Thanks,
Spenser
--
Spenser Gilliland
Computer Engineer
Doctoral Candidate
efine
rank.
Thanks,
Spenser
On May 9, 2014 7:22 PM, "Jeff Squyres (jsquyres)"
wrote:
> On May 9, 2014, at 7:56 PM, Spenser Gilliland
> wrote:
>
> > I'm having some trouble understanding Intercommunicators with
> > Collective Communication. Is there a collecti
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