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Old   April 26, 2010, 21:54
Default MPI combine data
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Pham Anh Hung
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Dear all!

I am beginner for parallel computing with MPI for fortran.

The data has been received for different Processes, the combination of all data need for the post-process.

So, how should I do to combine data from all different processes?

Thanks in advance!
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Old   May 17, 2010, 17:46
Default Collective Communication
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Hans Bihs
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Hei,

use MPI_GATHER, then all processes send data to the the root process. At the root process you can then assemble the data in the correct order and write out a solution file.
Note that this requires a lot of communication, especially if you have large data files. Maybe you can use a post-process tool that can deal with parallel output instead, like Paraview for example. That would be the most efficient solution.

Cheers
Hans
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Old   May 19, 2010, 05:07
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Nicholas F Camus
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Hei,
You could also write a serial code to collect all the bits of the parralell data in a single array. Then write that array to file. Simples.

Cheers,

NFC
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