MPI_ALLREDUCE(3) - Linux manual page online | Library functions
Combines values from all processes and distributes the result back to all processes.
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                 11/12/2016            
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| This manual | Reference | Other manuals | 
|---|---|---|
| MPI_Allreduce(3) | referred by | MPI_Allreduce.openmpi(3) | 
| refer to |