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// ***********************************************************************
//
// Teuchos: Common Tools Package
// Copyright (2004) Sandia Corporation
//
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
// license for use of this work by or on behalf of the U.S. Government.
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// modification, are permitted provided that the following conditions are
// met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// 3. Neither the name of the Corporation nor the names of the
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// Questions? Contact Michael A. Heroux (maherou@sandia.gov)
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// @HEADER
#ifndef TEUCHOS_DETAILS_MPITYPETRAITS_HPP
#define TEUCHOS_DETAILS_MPITYPETRAITS_HPP
/// \file Teuchos_Details_MpiTypeTraits.hpp
/// \brief Declaration of Teuchos::Details::MpiTypeTraits (only if
/// building with MPI)
#include "Teuchos_config.h"
#ifdef HAVE_TEUCHOS_MPI
#include <mpi.h>
#include <complex>
namespace Teuchos {
namespace Details {
/// \class MpiTypeTraits
/// \brief Traits class mapping from type T to its MPI_Datatype
/// \tparam T The type being sent or received. T must be default
/// constructible. It must also be either one of C++'s built-in
/// types (like \c int or \c double), or a struct or "struct-like"
/// type like <tt>std::complex<double</tt>, for which sizeof(T)
/// correctly conveys the amount of data to send or receive.
template<class T>
class MpiTypeTraits {
public:
/// \brief Whether this class is specialized for T.
///
/// If this class has <i>not</i> been specialized for T, then the
/// return value of getType (either the one-argument or
/// zero-argument version) is undefined.
static const bool isSpecialized = false;
/// \brief Whether you must call MPI_Type_free on the return value
/// of getType (both versions) after use.
///
/// It is illegal to call MPI_Type_free on a built-in MPI_Datatype.
/// It is required to call MPI_Type_free on a non-built-in ("custom"
/// or "derived") MPI_Datatype after use. In the latter case, the
/// MPI standard says that you may call MPI_Type_free on an
/// MPI_Datatype as soon as you are done using the MPI_Datatype in
/// your code on that process, even if there is an outstanding
/// asynchronous operation on that process that uses the
/// MPI_Datatype.
///
/// This applies to both the one-argument and the zero-argument
/// version of getType. If the return value of one needs freeing,
/// so must the return value of the other one. (IMPLEMENTERS:
/// Please make note of the previous sentence.)
static const bool needsFree = false;
/// \brief The MPI_Datatype corresponding to the given T instance.
///
/// For more generality, this method requires passing in a T
/// instance. The method may or may not ignore this instance,
/// depending on the type T. The reason for passing in an instance
/// is that some MPI_Datatype constructors, e.g., MPI_Type_struct,
/// need actual offsets of the fields in an actual instance of T, in
/// order to construct the MPI_Datatype safely and portably. If T
/// has no default constructor, we have no way of doing so without
/// accepting a T instance.
///
/// Specializations for T that do not need an instance of T in order
/// to construct the MPI_Datatype safely, may overload this method
/// not to require an instance of T. However, all specializations
/// must retain the overload that takes a T instance. This lets
/// users invoke this method in the same way for all types T.
static MPI_Datatype getType (const T&) {
// In this default implementation, isSpecialized == false, so the
// return value of getType is undefined. We have to return
// something, so we return the predefined "invalid" MPI_Datatype,
// MPI_DATATYPE_NULL. Specializations of getType need to redefine
// this method to return something other than MPI_DATATYPE_NULL.
return MPI_DATATYPE_NULL;
}
};
//
// Specializations of MpiTypeTraits.
//
/// \brief Specialization for T = char.
///
/// This requires MPI 1.2.
template<>
class MpiTypeTraits<char> {
public:
//! Whether this is a defined specialization of MpiTypeTraits (it is).
static const bool isSpecialized = true;
/// \brief Whether you must call MPI_Type_free on the return value
/// of getType (both versions) after use.
static const bool needsFree = false;
//! MPI_Datatype corresponding to the given T instance.
static MPI_Datatype getType (const char&) {
return MPI_CHAR;
}
//! MPI_Datatype corresponding to the type T.
static MPI_Datatype getType () {
return MPI_CHAR;
}
};
/// \brief Specialization for T = unsigned char.
///
/// This requires MPI 1.2.
template<>
class MpiTypeTraits<unsigned char> {
public:
//! Whether this is a defined specialization of MpiTypeTraits (it is).
static const bool isSpecialized = true;
/// \brief Whether you must call MPI_Type_free on the return value
/// of getType (both versions) after use.
static const bool needsFree = false;
//! MPI_Datatype corresponding to the given T instance.
static MPI_Datatype getType (const unsigned char&) {
return MPI_UNSIGNED_CHAR;
}
//! MPI_Datatype corresponding to the type T.
static MPI_Datatype getType () {
return MPI_UNSIGNED_CHAR;
}
};
#if MPI_VERSION >= 2
/// \brief Specialization for T = signed char.
///
/// This requires MPI 2.0.
template<>
class MpiTypeTraits<signed char> {
public:
//! Whether this is a defined specialization of MpiTypeTraits (it is).
static const bool isSpecialized = true;
/// \brief Whether you must call MPI_Type_free on the return value
/// of getType (both versions) after use.
static const bool needsFree = false;
//! MPI_Datatype corresponding to the given T instance.
static MPI_Datatype getType (const signed char&) {
return MPI_SIGNED_CHAR;
}
//! MPI_Datatype corresponding to the type T.
static MPI_Datatype getType () {
return MPI_SIGNED_CHAR;
}
};
#endif // MPI_VERSION >= 2
// mfh 09 Nov 2016: amb reports on 11 Nov 2014: "I am disabling these
// specializations for now. MPI_C_DOUBLE_COMPLEX is causing a problem
// in some builds. This code was effectively turned on only yesterday
// (10 Nov 2014) when TEUCHOS_HAVE_COMPLEX was corrected to be
// HAVE_TEUCHOS_COMPLEX, so evidently there are no users of these
// specializations."
//
// mfh 14 Nov 2016: my work-around for the above issue, is
// conservatively to assume that I need MPI_VERSION >= 3 for these
// types to exist. If I don't have MPI_VERSION >= 3, I create custom
// MPI_Datatype for these types.
namespace Impl {
/// \brief Struct for use in computeStdComplexMpiDatatype (see below).
///
/// The actual real and imaginary fields in std::complex<T> are
/// private. While the instance methods real() and imag() return
/// references to those fields, it's not legal to take the addresses
/// of the return values of those methods ("invalid initialization"
/// errors, etc.). Thus, we construct another struct here which
/// should have exactly the same layout, and use it in the function
/// below.
template<class T>
struct MyComplex {
T re;
T im;
};
/// \brief Compute MPI_Datatype for instance of std::complex<T>.
///
/// This function assumes the following:
/// <ul>
/// <li> <tt> MpiTypeTraits<T>::isSpecialized </tt> </li>
/// <li> <tt> ! MpiTypeTraits<T>::needsFree </tt>
/// <li> std::complex<T> has the same layout as
/// <tt>struct { T re; T im; };</tt> </li>
/// <li> Every instance of T has the same MPI_Datatype </li>
/// </ul>
template<class T>
MPI_Datatype
computeStdComplexMpiDatatype (const std::complex<T>& z)
{
#ifdef HAVE_TEUCHOSCORE_CXX11
static_assert (MpiTypeTraits<T>::isSpecialized, "This function only "
"works if MpiTypeTraits<T>::isSpecialized.");
static_assert (! MpiTypeTraits<T>::needsFree, "This function requires "
"! MpiTypeTraits<T>::needsFree, since otherwise it would "
"leak memory.");
#endif // HAVE_TEUCHOSCORE_CXX11
// We assume here that every instance of T has the same
// MPI_Datatype, i.e., has the same binary representation.
MPI_Datatype innerDatatype = MpiTypeTraits<T>::getType (z.real ());
MPI_Datatype outerDatatype; // return value
// If std::complex<T> has the same layout as T[2], then we can use a
// contiguous derived MPI_Datatype. This is likely the only code
// path that will execute. Contiguous types are likely more
// efficient for MPI to execute, and almost certainly more efficient
// for MPI to set up.
if (sizeof (std::complex<T>) == 2 * sizeof (T)) {
(void) MPI_Type_contiguous (2, innerDatatype, &outerDatatype);
}
else { // must use the general struct approach
// I borrowed and adapted the code below from the MPICH
// documentation:
//
// www.mpich.org/static/docs/v3.1/www3/MPI_Type_struct.html
int blockLengths[3];
MPI_Aint arrayOfDisplacements[3];
MPI_Datatype arrayOfTypes[3];
#ifdef HAVE_TEUCHOSCORE_CXX11
// See documentation of MyComplex (above) for explanation.
static_assert (sizeof (MyComplex<T>) == sizeof (std::complex<T>),
"Attempt to construct a struct of the same size and layout "
"as std::complex<T> failed.");
#endif // HAVE_TEUCHOSCORE_CXX11
MyComplex<T> z2;
// First entry in the struct.
blockLengths[0] = 1;
// Normally, &z2.re would equal &z2, but I'll be conservative and
// actually compute the offset, even though it's probably just 0.
//
// Need the cast to prevent the compiler complaining about
// subtracting addresses of different types.
arrayOfDisplacements[0] = reinterpret_cast<char*>(&z2.re) - reinterpret_cast<char*>(&z2);
arrayOfTypes[0] = innerDatatype;
// Second entry in the struct.
blockLengths[1] = 1;
arrayOfDisplacements[1] = reinterpret_cast<char*>(&z2.im) - reinterpret_cast<char*>(&z2);
arrayOfTypes[1] = innerDatatype;
#if MPI_VERSION < 2
// Upper bound of the struct.
blockLengths[2] = 1;
arrayOfDisplacements[2] = sizeof (MyComplex<T>);
arrayOfTypes[2] = MPI_UB; // "upper bound type"; signals end of struct
#endif // MPI_VERSION < 2
// Define the MPI_Datatype.
#if MPI_VERSION < 2
(void) MPI_Type_struct (3, blockLengths, arrayOfDisplacements,
arrayOfTypes, &outerDatatype);
#else
// Don't include the upper bound with MPI_Type_create_struct.
(void) MPI_Type_create_struct (2, blockLengths, arrayOfDisplacements,
arrayOfTypes, &outerDatatype);
#endif // MPI_VERSION < 2
}
MPI_Type_commit (&outerDatatype);
return outerDatatype;
}
} // namespace Impl
//! Specialization of MpiTypeTraits for std::complex<double>.
template<>
class MpiTypeTraits< std::complex<double> > {
private:
#if MPI_VERSION >= 3
static const bool hasMpi3 = true;
#else
static const bool hasMpi3 = false;
#endif // MPI_VERSION >= 3
public:
//! Whether this is a defined specialization of MpiTypeTraits (it is).
static const bool isSpecialized = true;
/// \brief Whether you must call MPI_Type_free on the return value
/// of getType (both versions) after use.
static const bool needsFree = ! hasMpi3;
//! MPI_Datatype corresponding to the given std::complex<double> instance.
static MPI_Datatype getType (const std::complex<double>& z) {
if (hasMpi3) {
#if MPI_VERSION >= 3
return MPI_C_DOUBLE_COMPLEX; // requires MPI 2.?
#else
return MPI_DATATYPE_NULL; // FIXME (mfh 17 Nov 2016) Better to throw?
#endif // MPI_VERSION >= 3
}
else { // ! hasMpi3
return Impl::computeStdComplexMpiDatatype<double> (z);
}
}
//! MPI_Datatype corresponding to all std::complex<double> instances.
static MPI_Datatype getType () {
if (hasMpi3) {
#if MPI_VERSION >= 3
return MPI_C_DOUBLE_COMPLEX; // requires MPI 2.?
#else
return MPI_DATATYPE_NULL; // FIXME (mfh 17 Nov 2016) Better to throw?
#endif // MPI_VERSION >= 3
}
else { // ! hasMpi3
// Values are arbitrary. The function just looks at the address
// offsets of the class fields, not their contents.
std::complex<double> z (3.0, 4.0);
return Impl::computeStdComplexMpiDatatype<double> (z);
}
}
};
template<>
class MpiTypeTraits< std::complex<float> > {
private:
#if MPI_VERSION >= 3
static const bool hasMpi3 = true;
#else
static const bool hasMpi3 = false;
#endif // MPI_VERSION >= 3
public:
//! Whether this is a defined specialization of MpiTypeTraits (it is).
static const bool isSpecialized = true;
/// \brief Whether you must call MPI_Type_free on the return value
/// of getType (both versions) after use.
static const bool needsFree = ! hasMpi3;
//! MPI_Datatype corresponding to the given std::complex<float> instance.
static MPI_Datatype getType (const std::complex<float>& z) {
if (hasMpi3) {
#if MPI_VERSION >= 3
return MPI_C_FLOAT_COMPLEX; // requires MPI 2.?
#else
return MPI_DATATYPE_NULL; // FIXME (mfh 17 Nov 2016) Better to throw?
#endif // MPI_VERSION >= 3
}
else { // ! hasMpi3
return Impl::computeStdComplexMpiDatatype<float> (z);
}
}
//! MPI_Datatype corresponding to all std::complex<float> instances.
static MPI_Datatype getType () {
if (hasMpi3) {
#if MPI_VERSION >= 3
return MPI_C_FLOAT_COMPLEX; // requires MPI 2.?
#else
return MPI_DATATYPE_NULL; // FIXME (mfh 17 Nov 2016) Better to throw?
#endif // MPI_VERSION >= 3
}
else { // ! hasMpi3
// Values are arbitrary. The function just looks at the address
// offsets of the class fields, not their contents.
std::complex<float> z (3.0, 4.0);
return Impl::computeStdComplexMpiDatatype<float> (z);
}
}
};
//! Specialization for T = double.
template<>
class MpiTypeTraits<double> {
public:
//! Whether this is a defined specialization of MpiTypeTraits (it is).
static const bool isSpecialized = true;
/// \brief Whether you must call MPI_Type_free on the return value
/// of getType (both versions) after use.
static const bool needsFree = false;
//! MPI_Datatype corresponding to the given T instance.
static MPI_Datatype getType (const double&) {
return MPI_DOUBLE;
}
//! MPI_Datatype corresponding to the type T.
static MPI_Datatype getType () {
return MPI_DOUBLE;
}
};
//! Specialization for T = float.
template<>
class MpiTypeTraits<float> {
public:
//! Whether this is a defined specialization of MpiTypeTraits (it is).
static const bool isSpecialized = true;
/// \brief Whether you must call MPI_Type_free on the return value
/// of getType (both versions) after use.
static const bool needsFree = false;
//! MPI_Datatype corresponding to the given T instance.
static MPI_Datatype getType (const float&) {
return MPI_FLOAT;
}
//! MPI_Datatype corresponding to the type T.
static MPI_Datatype getType () {
return MPI_FLOAT;
}
};
#ifdef HAVE_TEUCHOS_LONG_LONG_INT
//! Specialization for T = long long.
template<>
class MpiTypeTraits<long long> {
public:
//! Whether this is a defined specialization of MpiTypeTraits (it is).
static const bool isSpecialized = true;
/// \brief Whether you must call MPI_Type_free on the return value
/// of getType (both versions) after use.
static const bool needsFree = false;
//! MPI_Datatype corresponding to the given T instance.
static MPI_Datatype getType (const long long&) {
return MPI_LONG_LONG; // synonym for MPI_LONG_LONG_INT in MPI 2.2
}
//! MPI_Datatype corresponding to the type T.
static MPI_Datatype getType () {
return MPI_LONG_LONG;
}
};
#if MPI_VERSION >= 2
/// \brief Specialization for T = long long.
///
/// This requires MPI 2.0.
template<>
class MpiTypeTraits<unsigned long long> {
public:
//! Whether this is a defined specialization of MpiTypeTraits (it is).
static const bool isSpecialized = true;
/// \brief Whether you must call MPI_Type_free on the return value
/// of getType (both versions) after use.
static const bool needsFree = false;
//! MPI_Datatype corresponding to the given T instance.
static MPI_Datatype getType (const unsigned long long&) {
return MPI_UNSIGNED_LONG_LONG;
}
//! MPI_Datatype corresponding to the type T.
static MPI_Datatype getType () {
return MPI_UNSIGNED_LONG_LONG;
}
};
#endif // MPI_VERSION >= 2
#endif // HAVE_TEUCHOS_LONG_LONG_INT
//! Specialization for T = long.
template<>
class MpiTypeTraits<long> {
public:
//! Whether this is a defined specialization of MpiTypeTraits (it is).
static const bool isSpecialized = true;
/// \brief Whether you must call MPI_Type_free on the return value
/// of getType (both versions) after use.
static const bool needsFree = false;
//! MPI_Datatype corresponding to the given T instance.
static MPI_Datatype getType (const long&) {
return MPI_LONG;
}
//! MPI_Datatype corresponding to the type T.
static MPI_Datatype getType () {
return MPI_LONG;
}
};
//! Specialization for T = unsigned long.
template<>
class MpiTypeTraits<unsigned long> {
public:
//! Whether this is a defined specialization of MpiTypeTraits (it is).
static const bool isSpecialized = true;
/// \brief Whether you must call MPI_Type_free on the return value
/// of getType (both versions) after use.
static const bool needsFree = false;
//! MPI_Datatype corresponding to the given T instance.
static MPI_Datatype getType (const unsigned long&) {
return MPI_UNSIGNED_LONG;
}
//! MPI_Datatype corresponding to the type T.
static MPI_Datatype getType () {
return MPI_UNSIGNED_LONG;
}
};
//! Specialization for T = int.
template<>
class MpiTypeTraits<int> {
public:
//! Whether this is a defined specialization of MpiTypeTraits (it is).
static const bool isSpecialized = true;
/// \brief Whether you must call MPI_Type_free on the return value
/// of getType (both versions) after use.
static const bool needsFree = false;
//! MPI_Datatype corresponding to the given T instance.
static MPI_Datatype getType (const int&) {
return MPI_INT;
}
//! MPI_Datatype corresponding to the type T.
static MPI_Datatype getType () {
return MPI_INT;
}
};
//! Specialization for T = unsigned int.
template<>
class MpiTypeTraits<unsigned int> {
public:
//! Whether this is a defined specialization of MpiTypeTraits (it is).
static const bool isSpecialized = true;
/// \brief Whether you must call MPI_Type_free on the return value
/// of getType (both versions) after use.
static const bool needsFree = false;
//! MPI_Datatype corresponding to the given T instance.
static MPI_Datatype getType (const unsigned int&) {
return MPI_UNSIGNED;
}
//! MPI_Datatype corresponding to the type T.
static MPI_Datatype getType () {
return MPI_UNSIGNED;
}
};
//! Specialization for T = short.
template<>
class MpiTypeTraits<short> {
public:
//! Whether this is a defined specialization of MpiTypeTraits (it is).
static const bool isSpecialized = true;
/// \brief Whether you must call MPI_Type_free on the return value
/// of getType (both versions) after use.
static const bool needsFree = false;
//! MPI_Datatype corresponding to the given T instance.
static MPI_Datatype getType (const short&) {
return MPI_SHORT;
}
//! MPI_Datatype corresponding to the type T.
static MPI_Datatype getType () {
return MPI_SHORT;
}
};
//! Specialization for T = unsigned short.
template<>
class MpiTypeTraits<unsigned short> {
public:
//! Whether this is a defined specialization of MpiTypeTraits (it is).
static const bool isSpecialized = true;
/// \brief Whether you must call MPI_Type_free on the return value
/// of getType (both versions) after use.
static const bool needsFree = false;
//! MPI_Datatype corresponding to the given T instance.
static MPI_Datatype getType (const unsigned short&) {
return MPI_UNSIGNED_SHORT;
}
//! MPI_Datatype corresponding to the type T.
static MPI_Datatype getType () {
return MPI_UNSIGNED_SHORT;
}
};
} // namespace Details
} // namespace Teuchos
#endif // HAVE_TEUCHOS_MPI
#endif // TEUCHOS_DETAILS_MPITYPETRAITS_HPP
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