The basic outline of an MPI program follows these general steps:
- Initialize communications
- Communicate to share data between processes
- Exit in a "clean" fashion from the message-passing system when done communicating
MPI has more than 125 functions. However, a beginning programmer can usually make do with only six of these functions. A beginning programmer can usually make do with only six functions.These functions, illustrated and discussed in our sample program are:
- Initialize communications
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| MPI_INIT |
initializes the MPI environment |
| MPI_COMM_SIZE |
returns the number of processes |
| MPI_COMM_RANK |
returns this process's number (rank) |
- Communicate to share data between processes
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- MPI_SEND sends a message
- MPI_RECV receives a message
- Exit from the message-passing system
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- MPI_FINALIZE
