[Mpi-forum] C-MPI DYNAMIC ALLOCATION / DERIVED DATATYPES

[kostas pinokio]

HALLO,

I would like to send a whole column of a dynamicly allocated array (in C language).
When i use derived datatypes(for example MPI_Type_vector) i can send a column ONLY if i have static array but when i use dynamic allocation i have problem!
Please tell me one way to send a column of a dynamc allocated array.

For example :
      MPI_Datatype columntype;
      MPI_Type_vector(10, 1, 10, MPI_INT, &columntype);
      MPI_Type_commit(&columntype);
 if(rank==0){
                     dyn_array=(int **) calloc(10,sizeof(int *));
                     for(i = 0; i < 10; i++){
                             dyn_array[i] =(int *) calloc(10,sizeof(int));
                     }
                     for(i=0;i<10;i++){ for(j=0;j<10;j++) dyn_array[i][j]=9;}
                  MPI_Send(&dyn_array[0][0], 1, columntype, dest, tag,MPI_COMM_WORLD);
 }
if(rank==1){
    MPI_Recv(&other_dyn_array[0][0], 1, columntype, 0, tag, MPI_COMM_WORLD, &Stat);
}

the values of the receive are not correct!!

Thank You!


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