Here is how you can do this without having to redescribe the data type all
the time. This will also keep your data layout together and improve cache
coherency.
#include
#include
#include
using namespace std;
int main()
{
int N=2, M=3;
//Allocate the matrix
double **A=(double**)malloc(si
Eugene is right, every time you create a new matrix you will have to
describe it with a new datatype (even when using MPI_BOTTOM).
george.
On Oct 30, 2009, at 18:11 , Natarajan CS wrote:
Thanks for the replies guys! Definitely two suggestions worth
trying. Definitely didn't consider a deriv
Thanks for the replies guys! Definitely two suggestions worth trying.
Definitely didn't consider a derived datatype. I wasn't really sure that the
MPI_Send call overhead was significant enough that increasing the buffer
size and decreasing the number of calls would cause any speed up. Will
change t
Wouldn't you need to create a different datatype for each matrix
instance? E.g., let's say you create twelve 5x5 matrices. Wouldn't you
need twelve different derived datatypes? I would think so because each
time you create a matrix, the footprint of that matrix in memory will
depend on the w
Even with the original way to create the matrices, one can use
MPI_Create_type_struct to create an MPI datatype (http://web.mit.edu/course/13/13.715/OldFiles/build/mpich2-1.0.6p1/www/www3/MPI_Type_create_struct.html
) using MPI_BOTTOM as the original displacement.
george.
On Oct 29, 2009, a
Why not do something like this:
double **A=new double*[N];
double *A_data new double [N*N];
for(int i=0;i wrote:
> Hi
>thanks for the quick response. Yes, that is what I meant. I thought
> there was no other way around what I am doing but It is always good to ask a
> expert rather than assum
Hi
thanks for the quick response. Yes, that is what I meant. I thought there
was no other way around what I am doing but It is always good to ask a
expert rather than assume!
Cheers,
C.S.N
On Thu, Oct 29, 2009 at 11:25 AM, Eugene Loh wrote:
> Natarajan CS wrote:
>
> Hello all,
>>Fi
Natarajan CS wrote:
Hello all,
Firstly, My apologies for a duplicate post in LAM/MPI list I
have the following simple MPI code. I was wondering if there was a
workaround for sending a dynamically allocated 2-D matrix? Currently I
can send the matrix row-by-row, however, since rows are
Hello all,
Firstly, My apologies for a duplicate post in LAM/MPI list I have
the following simple MPI code. I was wondering if there was a workaround for
sending a dynamically allocated 2-D matrix? Currently I can send the matrix
row-by-row, however, since rows are not contiguous I cannot s
