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/*
* Copyright (c) 2017-2018 ARM Limited.
*
* SPDX-License-Identifier: MIT
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "arm_compute/runtime/OMP/OMPScheduler.h"
#include "arm_compute/core/CPP/ICPPKernel.h"
#include "arm_compute/core/Error.h"
#include "arm_compute/core/Helpers.h"
#include "arm_compute/core/Utils.h"
#include <omp.h>
using namespace arm_compute;
OMPScheduler &OMPScheduler::get()
{
static OMPScheduler scheduler;
return scheduler;
}
OMPScheduler::OMPScheduler() // NOLINT
: _num_threads(omp_get_max_threads())
{
}
unsigned int OMPScheduler::num_threads() const
{
return _num_threads;
}
void OMPScheduler::set_num_threads(unsigned int num_threads)
{
const unsigned int num_cores = omp_get_max_threads();
_num_threads = (num_threads == 0) ? num_cores : num_threads;
}
void OMPScheduler::schedule(ICPPKernel *kernel, unsigned int split_dimension)
{
ARM_COMPUTE_ERROR_ON_MSG(!kernel, "The child class didn't set the kernel");
ThreadInfo info;
info.cpu_info = _info;
const Window &max_window = kernel->window();
const unsigned int num_iterations = max_window.num_iterations(split_dimension);
info.num_threads = std::min(num_iterations, _num_threads);
if(!kernel->is_parallelisable() || info.num_threads == 1)
{
kernel->run(max_window, info);
}
else
{
#pragma omp parallel private(info) num_threads(info.num_threads)
{
const int tid = omp_get_thread_num();
Window win = max_window.split_window(split_dimension, tid, info.num_threads);
info.thread_id = tid;
kernel->run(win, info);
}
}
}
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