tuning.hpp

/* Copyright 2009-2017 Francesco Biscani (bluescarni@gmail.com)

This file is part of the Piranha library.

The Piranha library is free software; you can redistribute it and/or modify
it under the terms of either:

  * the GNU Lesser General Public License as published by the Free
    Software Foundation; either version 3 of the License, or (at your
    option) any later version.

or

  * the GNU General Public License as published by the Free Software
    Foundation; either version 3 of the License, or (at your option) any
    later version.

or both in parallel, as here.

The Piranha library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received copies of the GNU General Public License and the
GNU Lesser General Public License along with the Piranha library.  If not,
see https://www.gnu.org/licenses/. */

#ifndef PIRANHA_TUNING_HPP
#define PIRANHA_TUNING_HPP

#include <atomic>
#include <stdexcept>

#include <piranha/config.hpp>
#include <piranha/exceptions.hpp>
#include <piranha/runtime_info.hpp>

namespace piranha
{

namespace detail
{

template <typename = int>
struct base_tuning {
    static std::atomic<bool> s_parallel_memory_set;
    static std::atomic<unsigned long> s_mult_block_size;
    static std::atomic<unsigned long> s_estimate_threshold;
};

template <typename T>
std::atomic<bool> base_tuning<T>::s_parallel_memory_set(true);

template <typename T>
std::atomic<unsigned long> base_tuning<T>::s_mult_block_size(256u);

template <typename T>
std::atomic<unsigned long> base_tuning<T>::s_estimate_threshold(200u);
}


class tuning : private detail::base_tuning<>
{
public:

    static bool get_parallel_memory_set()
    {
        return s_parallel_memory_set.load();
    }

    static void set_parallel_memory_set(bool flag)
    {
        s_parallel_memory_set.store(flag);
    }

    static void reset_parallel_memory_set()
    {
        s_parallel_memory_set.store(true);
    }

    static unsigned long get_multiplication_block_size()
    {
        return s_mult_block_size.load();
    }

    static void set_multiplication_block_size(unsigned long size)
    {
        if (unlikely(size < 16u || size > 4096u)) {
            piranha_throw(std::invalid_argument, "invalid block size");
        }
        s_mult_block_size.store(size);
    }

    static void reset_multiplication_block_size()
    {
        s_mult_block_size.store(256u);
    }

    static unsigned long get_estimate_threshold()
    {
        return s_estimate_threshold.load();
    }

    static void set_estimate_threshold(unsigned long size)
    {
        s_estimate_threshold.store(size);
    }

    static void reset_estimate_threshold()
    {
        s_estimate_threshold.store(200u);
    }
};
}

#endif