1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// UNSUPPORTED: c++03, c++11, c++14, c++17
10
11#include "atomic_wait_helper.h"
12
13#include <atomic>
14#include <array>
15#include <chrono>
16#include <cstdint>
17#include <numeric>
18#include <stop_token>
19#include <thread>
20
21#include "benchmark/benchmark.h"
22#include "make_test_thread.h"
23
24using namespace std::chrono_literals;
25
26template <class NotifyPolicy, class NumPrioTasks>
27void BM_1_atomic_1_waiter_1_notifier(benchmark::State& state) {
28 [[maybe_unused]] std::array<HighPrioTask, NumPrioTasks::value> tasks{};
29 std::atomic<std::uint64_t> a;
30 auto thread_func = [&](std::stop_token st) { NotifyPolicy::notify(a, st); };
31
32 std::uint64_t total_loop_test_param = state.range(0);
33
34 auto thread = support::make_test_jthread(thread_func);
35
36 for (auto _ : state) {
37 for (std::uint64_t i = 0; i < total_loop_test_param; ++i) {
38 auto old = a.load(std::memory_order_relaxed);
39 a.wait(old);
40 }
41 }
42}
43
44BENCHMARK(BM_1_atomic_1_waiter_1_notifier<KeepNotifying, NumHighPrioTasks<0>>)
45 ->RangeMultiplier(2)
46 ->Range(1 << 16, 1 << 18);
47BENCHMARK(BM_1_atomic_1_waiter_1_notifier<NotifyEveryNus<50>, NumHighPrioTasks<0>>)
48 ->RangeMultiplier(2)
49 ->Range(1 << 10, 1 << 12);
50BENCHMARK(BM_1_atomic_1_waiter_1_notifier<NotifyEveryNus<100>, NumHighPrioTasks<0>>)
51 ->RangeMultiplier(2)
52 ->Range(1 << 10, 1 << 12);
53
54BENCHMARK(BM_1_atomic_1_waiter_1_notifier<KeepNotifying, NumHighPrioTasks<4>>)
55 ->RangeMultiplier(2)
56 ->Range(1 << 16, 1 << 18);
57BENCHMARK(BM_1_atomic_1_waiter_1_notifier<NotifyEveryNus<50>, NumHighPrioTasks<4>>)
58 ->RangeMultiplier(2)
59 ->Range(1 << 10, 1 << 12);
60BENCHMARK(BM_1_atomic_1_waiter_1_notifier<NotifyEveryNus<100>, NumHighPrioTasks<4>>)
61 ->RangeMultiplier(2)
62 ->Range(1 << 10, 1 << 12);
63
64BENCHMARK(BM_1_atomic_1_waiter_1_notifier<KeepNotifying, NumHighPrioTasks<7>>)
65 ->RangeMultiplier(2)
66 ->Range(1 << 4, 1 << 6);
67BENCHMARK(BM_1_atomic_1_waiter_1_notifier<NotifyEveryNus<50>, NumHighPrioTasks<7>>)
68 ->RangeMultiplier(2)
69 ->Range(1 << 3, 1 << 5);
70BENCHMARK(BM_1_atomic_1_waiter_1_notifier<NotifyEveryNus<100>, NumHighPrioTasks<7>>)
71 ->RangeMultiplier(2)
72 ->Range(1 << 3, 1 << 5);
73
74BENCHMARK_MAIN();
75

source code of libcxx/test/benchmarks/atomic_wait_1_waiter_1_notifier.bench.cpp