Hi Alessandro,
As far as I understood , you want to send a row of your two dimensional
array using MPI sending functions.
This is of course possible in a simple way. You can send/receive data
with any type and any size using MPI
but you should tell MPI the type your data using MPI_Datatype structure.
For example code below send 10
integers in an array of ints in C:
int temp[10];
.
.
.
MPI_Send(tmp, 10, MPI_INT, procID, mtag, THECOM);
Use this link to see a complete list of MPI data types:
http://users.cs.cf.ac.uk/David.W.Walker/mpitutorial/node50.html
Cheers,
Danesh
Alessandro Palandri skrev:
Hello,
I am a new user of MPI and I would like to have your opinion on the
following issue.
With 1 processor I keep the data in
std::vector<std::vector<double> > X
Then I call a function that takes various arguments, among which X[ i
] and X[ j ], i.e. two sub-vectors of X.
With MPI I would have the same function execute on different
processors for different values of i and j in X[ i ] and X[ j ].
From my understanding since std::vector is not an MPI type it cannot
be passed neither as a message nor an element of an MPI structure. I
thought of using
double X[200][4000]
which MPI would pass but I don't see how to isolate a single row, i.e.
X[99] would not make sense in this context.
Any suggestion for an efficient and possibly simple solution?
Thank you for your help,
Alessandro
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