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What does OpenMPI message look like? What IPC mechanism does OpenMPI use?

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Hello! New MPI user here.

I made a hello world program, running on two processes. The first process passes "hello world" message to the second process to be printed out.

Invoking the program via command line:

    mpirun -np 2 a.out

I get the correct output.

But I do not understand the communication mechanism used by OpenMPI, especially:

- In the case above `mpirun -np 2`, what mechanism is used for IPC? Domain socket/pipe/TCP/file?
- What does the message "hello world" look like passing in between the two processes? How does OpenMPI encode the string?

Thanks.
Howard

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What does OpenMPI message look like? What IPC mechanism does OpenMPI use? guohouzuo@gmail.com - 2014-05-21 08:49 -0700

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