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Subject: [OMPI users] Passing data structure
From: Alessandro Palandri (alessandro.palandri_at_[hidden])
Date: 2008-04-11 12:33:53


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

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,