/usr/include/deal.II/base/mpi.templates.h is in libdeal.ii-dev 8.5.1-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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//
// Copyright (C) 2011 - 2017 by the deal.II authors
//
// This file is part of the deal.II library.
//
// The deal.II library is free software; you can use it, redistribute
// it, and/or modify it under the terms of the GNU Lesser General
// Public License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// The full text of the license can be found in the file LICENSE at
// the top level of the deal.II distribution.
//
// ---------------------------------------------------------------------
#ifndef dealii__mpi_templates_h
#define dealii__mpi_templates_h
#include <deal.II/base/config.h>
#include <deal.II/base/exceptions.h>
#include <deal.II/base/mpi.h>
#include <deal.II/base/tensor.h>
#include <deal.II/base/symmetric_tensor.h>
#include <deal.II/lac/vector.h>
#include <vector>
DEAL_II_NAMESPACE_OPEN
namespace Utilities
{
namespace MPI
{
namespace internal
{
#ifdef DEAL_II_WITH_MPI
/**
* Return the corresponding MPI data type id for the argument given.
*/
inline MPI_Datatype mpi_type_id (const int *)
{
return MPI_INT;
}
inline MPI_Datatype mpi_type_id (const long int *)
{
return MPI_LONG;
}
inline MPI_Datatype mpi_type_id (const unsigned int *)
{
return MPI_UNSIGNED;
}
inline MPI_Datatype mpi_type_id (const unsigned long int *)
{
return MPI_UNSIGNED_LONG;
}
inline MPI_Datatype mpi_type_id (const unsigned long long int *)
{
return MPI_UNSIGNED_LONG_LONG;
}
inline MPI_Datatype mpi_type_id (const float *)
{
return MPI_FLOAT;
}
inline MPI_Datatype mpi_type_id (const double *)
{
return MPI_DOUBLE;
}
inline MPI_Datatype mpi_type_id (const long double *)
{
return MPI_LONG_DOUBLE;
}
#endif
template <typename T>
void all_reduce (const MPI_Op &mpi_op,
const T *const values,
const MPI_Comm &mpi_communicator,
T *output,
const std::size_t size)
{
#ifdef DEAL_II_WITH_MPI
if (job_supports_mpi())
{
const int ierr = MPI_Allreduce
(values != output
?
// TODO This const_cast is only needed for older
// (e.g., openMPI 1.6, released in 2012)
// implementations of MPI-2. It is not needed as
// of MPI-3 and we should remove it at some
// point in the future.
const_cast<void *>(static_cast<const void *>(values))
:
MPI_IN_PLACE,
static_cast<void *>(output),
static_cast<int>(size),
internal::mpi_type_id(values),
mpi_op,
mpi_communicator);
AssertThrowMPI(ierr);
}
else
#endif
{
(void)mpi_op;
(void)mpi_communicator;
for (std::size_t i=0; i<size; ++i)
output[i] = values[i];
}
}
template <typename T>
void all_reduce (const MPI_Op &mpi_op,
const std::complex<T> *const values,
const MPI_Comm &mpi_communicator,
std::complex<T> *output,
const std::size_t size)
{
#ifdef DEAL_II_WITH_MPI
if (job_supports_mpi())
{
T dummy_selector;
const int ierr = MPI_Allreduce
(values != output
?
// TODO This const_cast is only needed for older
// (e.g., openMPI 1.6, released in 2012)
// implementations of MPI-2. It is not needed as
// of MPI-3 and we should remove it at some
// point in the future.
const_cast<void *>(static_cast<const void *>(values))
:
MPI_IN_PLACE,
static_cast<void *>(output),
static_cast<int>(size*2),
internal::mpi_type_id(&dummy_selector),
mpi_op,
mpi_communicator);
AssertThrowMPI(ierr);
}
else
#endif
{
(void)mpi_op;
(void)mpi_communicator;
for (std::size_t i=0; i<size; ++i)
output[i] = values[i];
}
}
template <typename T>
T all_reduce (const MPI_Op &mpi_op,
const T &t,
const MPI_Comm &mpi_communicator)
{
T output;
all_reduce(mpi_op, &t, mpi_communicator, &output, 1);
return output;
}
template <typename T>
void all_reduce (const MPI_Op &mpi_op,
const std::vector<T> &values,
const MPI_Comm &mpi_communicator,
std::vector<T> &output)
{
Assert(values.size() == output.size(),
ExcDimensionMismatch(values.size(), output.size()));
all_reduce(mpi_op, &values[0], mpi_communicator, &output[0], values.size());
}
template <typename T>
void all_reduce (const MPI_Op &mpi_op,
const Vector<T> &values,
const MPI_Comm &mpi_communicator,
Vector<T> &output)
{
Assert(values.size() == output.size(),
ExcDimensionMismatch(values.size(), output.size()));
all_reduce(mpi_op, values.begin(), mpi_communicator, output.begin(), values.size());
}
}
template <typename T>
T sum (const T &t,
const MPI_Comm &mpi_communicator)
{
return internal::all_reduce(MPI_SUM, t, mpi_communicator);
}
template <typename T>
void sum (const std::vector<T> &values,
const MPI_Comm &mpi_communicator,
std::vector<T> &sums)
{
internal::all_reduce(MPI_SUM, values, mpi_communicator, sums);
}
template <typename T>
void sum (const Vector<T> &values,
const MPI_Comm &mpi_communicator,
Vector<T> &sums)
{
internal::all_reduce(MPI_SUM, values, mpi_communicator, sums);
}
template <int rank, int dim, typename Number>
Tensor<rank,dim,Number>
sum (const Tensor<rank,dim,Number> &local,
const MPI_Comm &mpi_communicator)
{
const unsigned int n_entries = Tensor<rank,dim,Number>::n_independent_components;
Number entries[ Tensor<rank,dim,Number>::n_independent_components ];
for (unsigned int i=0; i< n_entries; ++i)
entries[i] = local[ local.unrolled_to_component_indices(i) ];
Number global_entries[ Tensor<rank,dim,Number>::n_independent_components ];
dealii::Utilities::MPI::sum( entries, mpi_communicator, global_entries );
Tensor<rank,dim,Number> global;
for (unsigned int i=0; i< n_entries; ++i)
global[ global.unrolled_to_component_indices(i) ] = global_entries[i];
return global;
}
template <int rank, int dim, typename Number>
SymmetricTensor<rank,dim,Number>
sum (const SymmetricTensor<rank,dim,Number> &local,
const MPI_Comm &mpi_communicator)
{
const unsigned int n_entries = SymmetricTensor<rank,dim,Number>::n_independent_components;
Number entries[ SymmetricTensor<rank,dim,Number>::n_independent_components ];
for (unsigned int i=0; i< n_entries; ++i)
entries[i] = local[ local.unrolled_to_component_indices(i) ];
Number global_entries[ SymmetricTensor<rank,dim,Number>::n_independent_components ];
dealii::Utilities::MPI::sum( entries, mpi_communicator, global_entries );
SymmetricTensor<rank,dim,Number> global;
for (unsigned int i=0; i< n_entries; ++i)
global[ global.unrolled_to_component_indices(i) ] = global_entries[i];
return global;
}
template <typename T>
T max (const T &t,
const MPI_Comm &mpi_communicator)
{
return internal::all_reduce(MPI_MAX, t, mpi_communicator);
}
template <typename T>
void max (const std::vector<T> &values,
const MPI_Comm &mpi_communicator,
std::vector<T> &maxima)
{
internal::all_reduce(MPI_MAX, values, mpi_communicator, maxima);
}
template <typename T>
T min (const T &t,
const MPI_Comm &mpi_communicator)
{
return internal::all_reduce(MPI_MIN, t, mpi_communicator);
}
template <typename T>
void min (const std::vector<T> &values,
const MPI_Comm &mpi_communicator,
std::vector<T> &minima)
{
internal::all_reduce(MPI_MIN, values, mpi_communicator, minima);
}
} // end of namespace MPI
} // end of namespace Utilities
DEAL_II_NAMESPACE_CLOSE
#endif
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