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Function all_to_all

boost::mpi::all_to_all — Send data from every process to every other process.

Synopsis

// In header: <boost/mpi/collectives.hpp>


template<typename T> 
  void all_to_all(const communicator & comm, 
                  const std::vector< T > & in_values, 
                  std::vector< T > & out_values);
template<typename T> 
  void all_to_all(const communicator & comm, const T * in_values, 
                  T * out_values);
template<typename T> 
  void all_to_all(const communicator & comm, 
                  const std::vector< T > & in_values, int n, 
                  std::vector< T > & out_values);
template<typename T> 
  void all_to_all(const communicator & comm, const T * in_values, int n, 
                  T * out_values);

Description

all_to_all is a collective algorithm that transmits p values from every process to every other process. On process i, jth value of the in_values vector is sent to process j and placed in the ith position of the out_values vector in process j. The type T of the values may be any type that is serializable or has an associated MPI data type. If n is provided, then arrays of n values will be transferred from one process to another.

When the type T has an associated MPI data type, this routine invokes MPI_Alltoall to scatter the values.

Parameters:

comm

The communicator over which the all-to-all communication will occur.

in_values

A vector or pointer to storage that contains the values to send to each process, indexed by the process ID number.

out_values

A vector or pointer to storage that will be updated to contain the values received from other processes. The jth value in out_values will come from the procss with rank j.


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