backend_omp.hpp

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//============================================================================
// vSMC/include/vsmc/smp/backend_omp.hpp
//----------------------------------------------------------------------------
//                         vSMC: Scalable Monte Carlo
//----------------------------------------------------------------------------
// Copyright (c) 2013,2014, Yan Zhou
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//   Redistributions of source code must retain the above copyright notice,
//   this list of conditions and the following disclaimer.
//
//   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.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS AS IS
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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//============================================================================

#ifndef VSMC_SMP_BACKEND_OMP_HPP
#define VSMC_SMP_BACKEND_OMP_HPP

#include <vsmc/smp/backend_base.hpp>
#include <omp.h>

namespace vsmc {

VSMC_DEFINE_SMP_FORWARD(OMP)

template <typename BaseState>
class StateOMP : public BaseState
{
    public :

    typedef typename traits::OMPSizeTypeTrait<
        typename traits::SizeTypeTrait<BaseState>::type>::type size_type;

    explicit StateOMP (size_type N) :
        BaseState(static_cast<
                typename traits::SizeTypeTrait<BaseState>::type>(N)) {}

    size_type size () const {return static_cast<size_type>(BaseState::size());}

    template <typename IntType>
    void copy (size_type N, const IntType *copy_from)
    {
        VSMC_RUNTIME_ASSERT_SMP_BACKEND_BASE_COPY_SIZE_MISMATCH(OMP);

#pragma omp parallel for default(shared)
        for (size_type to = 0; to < N; ++to)
            this->copy_particle(copy_from[to], to);
    }
}; // class StateOMP

template <typename T, typename Derived>
class InitializeOMP : public InitializeBase<T, Derived>
{
    public :

    std::size_t operator() (Particle<T> &particle, void *param)
    {
        typedef typename traits::OMPSizeTypeTrait<
            typename Particle<T>::size_type>::type size_type;
        const size_type N = static_cast<size_type>(particle.size());
        this->initialize_param(particle, param);
        this->pre_processor(particle);
        std::size_t accept = 0;
#pragma omp parallel for reduction(+ : accept) default(shared)
        for (size_type i = 0; i < N; ++i)
            accept += this->initialize_state(SingleParticle<T>(i, &particle));
        this->post_processor(particle);

        return accept;
    }

    protected :

    VSMC_DEFINE_SMP_IMPL_COPY(OMP, Initialize)
}; // class InitializeOMP

template <typename T, typename Derived>
class MoveOMP : public MoveBase<T, Derived>
{
    public :

    std::size_t operator() (std::size_t iter, Particle<T> &particle)
    {
        typedef typename traits::OMPSizeTypeTrait<
            typename Particle<T>::size_type>::type size_type;
        const size_type N = static_cast<size_type>(particle.size());
        this->pre_processor(iter, particle);
        std::size_t accept = 0;
#pragma omp parallel for reduction(+ : accept) default(shared)
        for (size_type i = 0; i < N; ++i)
            accept += this->move_state(iter, SingleParticle<T>(i, &particle));
        this->post_processor(iter, particle);

        return accept;
    }

    protected :

    VSMC_DEFINE_SMP_IMPL_COPY(OMP, Move)
}; // class MoveOMP

template <typename T, typename Derived>
class MonitorEvalOMP : public MonitorEvalBase<T, Derived>
{
    public :

    void operator() (std::size_t iter, std::size_t dim,
            const Particle<T> &particle, double *res)
    {
        typedef typename traits::OMPSizeTypeTrait<
            typename Particle<T>::size_type>::type size_type;
        const size_type N = static_cast<size_type>(particle.size());
        this->pre_processor(iter, particle);
#pragma omp parallel for default(shared)
        for (size_type i = 0; i < N; ++i) {
            this->monitor_state(iter, dim,
                    ConstSingleParticle<T>(i, &particle), res + i * dim);
        }
        this->post_processor(iter, particle);
    }

    protected :

    VSMC_DEFINE_SMP_IMPL_COPY(OMP, MonitorEval)
}; // class MonitorEvalOMP

template <typename T, typename Derived>
class PathEvalOMP : public PathEvalBase<T, Derived>
{
    public :

    double operator() (std::size_t iter, const Particle<T> &particle,
            double *res)
    {
        typedef typename traits::OMPSizeTypeTrait<
            typename Particle<T>::size_type>::type size_type;
        const size_type N = static_cast<size_type>(particle.size());
        this->pre_processor(iter, particle);
#pragma omp parallel for default(shared)
        for (size_type i = 0; i < N; ++i) {
            res[i] = this->path_state(iter,
                    ConstSingleParticle<T>(i, &particle));
        }
        this->post_processor(iter, particle);

        return this->path_grid(iter, particle);
    }

    protected :

    VSMC_DEFINE_SMP_IMPL_COPY(OMP, PathEval)
}; // class PathEvalOMP

} // namespace vsmc

#endif // VSMC_SMP_BACKEND_OMP_HPP