triqs::stat::histogram::mpi_reduce

#include <triqs/stat.hpp>

Synopsis

histogram mpi_reduce (histogram const & h,

communicator c = {},

int root = 0,

bool all = false,

MPI_Op op = MPI_SUM)

MPI-reduce histogram. The only supported reduction operation is MPI_SUM, which is equivalent to operator+().

Parameters

• h Histogram subject to reduction
• c MPI communicator object
• root MPI root rank for MPI reduction
• all Send reduction result to all ranks in c?
• op Reduction operation, must be MPI_SUM

Returns

Reduction result; valid only on MPI rank 0 if all = false