I don't think there is a way to guess, that is why most languages use a naming type (i.e.: int, float, etc) to explicitly tell what the type is. If this app is letting them enter whatever they want and without knowing more about this application, then I could assume it is giving them the type of string as languages such as Visual Basic, Visual C++ and C# do in the GUI.
-----Original Message----- From: users-boun...@open-mpi.org [mailto:users-boun...@open-mpi.org] On Behalf Of Sylvestre Ledru Sent: Sunday, April 25, 2010 8:46 AM To: us...@open-mpi.org Subject: [OMPI users] How to "guess" the incoming data type ? Hello, I am currently extending an application with MPI capabilities. This high-level application allows users to use dynamic types. Therefor, on the slaves, I have no way to know what the master will send me. Therefor, in the slave side, I need to "guess" what I am receiving. For example, I am using contiguous data on the master defined this way: MPI_Datatype matrixOfDouble; MPI_Type_contiguous(size, MPI_DOUBLE, &matrixOfDouble); MPI_Type_commit(&matrixOfDouble); sent this way: double A[] = {1,3,3,2,3,4}; MPI_Send(&A, 1, matrixOfDouble, i, TAG, MPI_COMM_WORLD); On the slave, in my example, since I know I am going to receive a matrixOfDouble, I can do the following: MPI_Probe( MPI_ANY_SOURCE, TAG, MPI_COMM_WORLD, &stat ); MPI_Get_elements( &stat, matrixOfDouble, &count); double BRecv[count]; MPI_Recv(BRecv, BUFSIZE, matrixOfDouble, i, TAG, MPI_COMM_WORLD, &stat) I would like to know if (and how) it is possible on the slave side to know that the received type is matrixOfDouble ? If it is not possible, is there any other way in MPI ? (I would like to avoid a extra master=> slave message to send the type). Thanks Sylvestre _______________________________________________ users mailing list us...@open-mpi.org http://www.open-mpi.org/mailman/listinfo.cgi/users
