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/*
* Copyright (c) 2017 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/CL/CLTuner.h"
#include "arm_compute/core/CL/ICLKernel.h"
#include "arm_compute/runtime/CL/CLScheduler.h"
#include <chrono>
#include <limits>
#include <string>
using namespace arm_compute;
CLTuner::CLTuner()
: _lws_table()
{
}
void CLTuner::tune_kernel(ICLKernel &kernel)
{
// Get the configuration ID from the kernel
const std::string &config_id = kernel.config_id();
// Check if we need to find the Optimal LWS. If config_id is equal to default_config_id, the kernel does not require to be tuned
if(config_id != arm_compute::default_config_id)
{
auto p = _lws_table.find(config_id);
if(p == _lws_table.end())
{
// Find the optimal LWS for the kernel
cl::NDRange opt_lws = find_optimal_lws(kernel);
// Insert the optimal LWS in the table
_lws_table.emplace(config_id, opt_lws);
// Set Local-Workgroup-Size
kernel.set_lws_hint(opt_lws);
}
else
{
// Set Local-Workgroup-Size
kernel.set_lws_hint(p->second);
}
}
}
cl::NDRange CLTuner::find_optimal_lws(ICLKernel &kernel)
{
cl::CommandQueue q = CLScheduler::get().queue();
double min_exec_time = std::numeric_limits<double>::max();
cl::NDRange opt_lws = cl::NDRange(1, 1);
for(int y = 1; y <= 16; ++y)
{
for(int x = 1; x <= 16; ++x)
{
cl::NDRange lws_test = cl::NDRange(x, y);
//Set the Local-Workgroup-Size
kernel.set_lws_hint(lws_test);
auto t_start = std::chrono::high_resolution_clock::now();
// Run
kernel.run(kernel.window(), q);
CLScheduler::get().sync();
auto t_stop = std::chrono::high_resolution_clock::now();
std::chrono::duration<double, std::nano> fp_nano = t_stop - t_start;
// Check the execution time
if(fp_nano.count() < min_exec_time)
{
min_exec_time = fp_nano.count();
opt_lws = cl::NDRange(x, y);
}
}
}
return opt_lws;
}
void CLTuner::import_lws_table(const std::unordered_map<std::string, cl::NDRange> &lws_table)
{
_lws_table.clear();
_lws_table = lws_table;
}
const std::unordered_map<std::string, cl::NDRange> &CLTuner::export_lws_table()
{
return _lws_table;
}
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