1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
|
/*
* 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 "arm_compute/runtime/CPUUtils.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, const Hints &hints)
{
ARM_COMPUTE_ERROR_ON_MSG(!kernel, "The child class didn't set the kernel");
ARM_COMPUTE_ERROR_ON_MSG(hints.strategy() == StrategyHint::DYNAMIC,
"Dynamic scheduling is not supported in OMPScheduler");
const Window &max_window = kernel->window();
const unsigned int num_iterations = max_window.num_iterations(hints.split_dimension());
const unsigned int num_threads = std::min(num_iterations, _num_threads);
if(!kernel->is_parallelisable() || num_threads == 1)
{
ThreadInfo info;
info.cpu_info = &_cpu_info;
kernel->run(max_window, info);
}
else
{
const unsigned int num_windows = num_threads;
std::vector<IScheduler::Workload> workloads(num_windows);
for(unsigned int t = 0; t < num_windows; t++)
{
//Capture 't' by copy, all the other variables by reference:
workloads[t] = [t, &hints, &max_window, &num_windows, &kernel](const ThreadInfo & info)
{
Window win = max_window.split_window(hints.split_dimension(), t, num_windows);
win.validate();
kernel->run(win, info);
};
}
run_workloads(workloads);
}
}
#ifndef DOXYGEN_SKIP_THIS
void OMPScheduler::run_workloads(std::vector<arm_compute::IScheduler::Workload> &workloads)
{
const unsigned int num_threads = std::min(_num_threads, static_cast<unsigned int>(workloads.size()));
if(num_threads < 1)
{
return;
}
ThreadInfo info;
info.cpu_info = &_cpu_info;
info.num_threads = num_threads;
#pragma omp parallel firstprivate(info) num_threads(num_threads)
{
const int tid = omp_get_thread_num();
info.thread_id = tid;
workloads[tid](info);
}
}
#endif /* DOXYGEN_SKIP_THIS */
|
