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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/CL/CLTuner.h"
#include "arm_compute/core/CL/ICLKernel.h"
#include "arm_compute/core/Error.h"
#include "arm_compute/runtime/CL/CLScheduler.h"
#include <limits>
#include <string>
using namespace arm_compute;
CLTuner::CLTuner()
: real_function(nullptr), _lws_table(), _queue(), _queue_profiler(), _kernel_event()
{
}
void CLTuner::set_cl_kernel_event(cl_event kernel_event)
{
_kernel_event = kernel_event;
}
void CLTuner::tune_kernel(ICLKernel &kernel)
{
if(real_function == nullptr)
{
real_function = CLSymbols::get().clEnqueueNDRangeKernel_ptr;
// Get the default queue
_queue = CLScheduler::get().queue();
// Check if we can use the OpenCL timer with the default queue
cl_command_queue_properties props = _queue.getInfo<CL_QUEUE_PROPERTIES>();
if((props & CL_QUEUE_PROFILING_ENABLE) == 0)
{
// Set the queue for profiling
_queue_profiler = cl::CommandQueue(CLScheduler::get().context(), props | CL_QUEUE_PROFILING_ENABLE);
}
else
{
_queue_profiler = _queue;
}
}
// 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())
{
// Set profiler queue
CLScheduler::get().set_queue(_queue_profiler);
// 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);
// Restore queue
CLScheduler::get().set_queue(_queue);
}
else
{
// Set Local-Workgroup-Size
kernel.set_lws_hint(p->second);
}
}
}
cl::NDRange CLTuner::find_optimal_lws(ICLKernel &kernel)
{
// Start intercepting enqueues:
CLSymbols::get().clEnqueueNDRangeKernel_ptr = Interceptor(*this);
cl_ulong min_exec_time = std::numeric_limits<cl_ulong>::max();
cl::NDRange opt_lws = cl::NullRange;
const int x_step = std::max(1, kernel.window().x().step());
const int y_step = std::max(1, kernel.window().y().step());
const int z_step = std::max(1, kernel.window().z().step());
const int x_end = kernel.window().x().end() - kernel.window().x().start() / x_step > 1 ? 16 : 1;
const int y_end = kernel.window().y().end() - kernel.window().y().start() / y_step > 1 ? 16 : 1;
const int z_end = kernel.window().z().end() - kernel.window().z().start() / z_step > 1 ? 8 : 1;
// First run using the default LWS
{
cl::NDRange lws_test = cl::NullRange;
kernel.set_lws_hint(lws_test);
// Run the kernel
kernel.run(kernel.window(), _queue_profiler);
CLScheduler::get().sync();
const cl_ulong start = _kernel_event.getProfilingInfo<CL_PROFILING_COMMAND_START>();
const cl_ulong end = _kernel_event.getProfilingInfo<CL_PROFILING_COMMAND_END>();
const cl_ulong diff = end - start;
min_exec_time = diff;
}
for(int z = 1; z <= z_end; ++z)
{
for(int y = 1; y <= y_end; ++y)
{
for(int x = 1; x <= x_end; ++x)
{
cl::NDRange lws_test = cl::NDRange(x, y, z);
const bool invalid_lws = (x * y * z > static_cast<int>(kernel.get_max_workgroup_size())) || (x == 1 && y == 1 && z == 1);
if(invalid_lws)
{
continue;
}
//Set the Local-Workgroup-Size
kernel.set_lws_hint(lws_test);
// Run the kernel
kernel.run(kernel.window(), _queue_profiler);
CLScheduler::get().sync();
const cl_ulong start = _kernel_event.getProfilingInfo<CL_PROFILING_COMMAND_START>();
const cl_ulong end = _kernel_event.getProfilingInfo<CL_PROFILING_COMMAND_END>();
const cl_ulong diff = end - start;
// Check the execution time
if(diff < min_exec_time)
{
min_exec_time = diff;
opt_lws = cl::NDRange(x, y, z);
}
}
}
}
// Restore real function
CLSymbols::get().clEnqueueNDRangeKernel_ptr = real_function;
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;
}
Interceptor::Interceptor(CLTuner &tuner)
: _tuner(tuner)
{
}
cl_int Interceptor::operator()(cl_command_queue command_queue, cl_kernel kernel, cl_uint work_dim, const size_t *gwo, const size_t *gws, const size_t *lws, cl_uint num_events_in_wait_list,
const cl_event *event_wait_list, cl_event *event)
{
ARM_COMPUTE_ERROR_ON_MSG(event != nullptr, "Not supported");
ARM_COMPUTE_UNUSED(event);
cl_event tmp;
cl_int retval = _tuner.real_function(command_queue, kernel, work_dim, gwo, gws, lws, num_events_in_wait_list, event_wait_list, &tmp);
// Set OpenCL event
_tuner.set_cl_kernel_event(tmp);
return retval;
}
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