MPI Programming for newbie

- Wei Mu

Wednesday, April 18, 12

Agenda

• What’s MPI

• Why Choose it

• MPI Basic Subroutine

• Sample 01: Send & Receive

• Sample 02: π Calculation

Wednesday, April 18, 12

What's MPI?

• A LIBRARY , NOT a programming language

• Standard

• Message Passing Interface

• Work with FORTRAN & C

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Why Choose it ?

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MPI Basic Subroutine# include “mpi.h”int main(int argc, char *argv[]){......

MPI_Init();......

MPI_Comm_rank(MPI_COMM, int *rank);MPI_Comm_size(MPI_COMM, int *size);

.....MPI_Finalize();

}

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Sample 01: Send & Receive

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Sample 02: π Calculation

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Reference: SubroutinesMPI_Send(buf, count, datatype, dest, tag, comm, ierror)

MPI_Recv(buf, count, datatype, source, tag, comm, status, ierror)

MPI_BCAST(buffer,count,datatype,root,comm)

MPI_BARRIER(comm)

MPI_REDUCE(sendbuf,recvbuf,count,datatype,op,root,comm)

...... ......

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Q & A , Feedback

• What’s your next steps of MPI Programming

• Which gives you more interest on MPI Programming

Wednesday, April 18, 12