Physics3D/benchmarks/threadResponseTime.cpp at master · ThePhysicsGuys/Physics3D · GitHub

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
#include "benchmark.h"

#include <iostream>
#include <chrono>
#include <mutex>
#include <thread>
#include <vector>

#include <Physics3D/threading/threadPool.h>

using namespace std::chrono;

namespace P3D {
class ThreadCreateBenchmark : public Benchmark {
public:
	ThreadCreateBenchmark() : Benchmark("threadCreateResponseTime") {}

	virtual void init() override {}

	virtual void run() override {
		decltype(high_resolution_clock::now()) start;

		std::mutex coutMutex;

		std::cout << "\n";
		auto work = [&start, &coutMutex]() {
			auto response = high_resolution_clock::now();

			nanoseconds delay = response - start;

			coutMutex.lock();
			std::cout << delay.count() / 1000 << " microseconds\n";
			coutMutex.unlock();
			std::this_thread::sleep_for(milliseconds(1000));
		};

		std::vector<std::thread> threads(std::thread::hardware_concurrency() - 1);

		for(int iter = 0; iter < 5; iter++) {
			std::cout << "Run " << iter << "\n";
			start = high_resolution_clock::now();
			for(std::thread& t : threads) t = std::thread(work);
			work();
			for(std::thread& t : threads) t.join();
		}
	}

	virtual void printResults(double timeTaken) override {}

} threadCreate;

class ThreadPoolBenchmark : public Benchmark {
public:
	ThreadPoolBenchmark() : Benchmark("threadPoolResponseTime") {}

	virtual void init() override {}

	virtual void run() override {
		decltype(high_resolution_clock::now()) start;

		std::mutex coutMutex;

		std::cout << "\n";
		auto work = [&start, &coutMutex]() {
			auto response = high_resolution_clock::now();

			nanoseconds delay = response - start;

			coutMutex.lock();
			std::cout << delay.count() / 1000 << " microseconds\n";
			coutMutex.unlock();
			std::this_thread::sleep_for(milliseconds(1000));
		};

		std::vector<std::thread> threads(std::thread::hardware_concurrency() - 1);

		ThreadPool threadPool;

		for(int iter = 0; iter < 5; iter++) {
			std::cout << "Run " << iter << "\n";
			start = high_resolution_clock::now();
			threadPool.doInParallel(work);
		}
	}

	virtual void printResults(double timeTaken) override {}

} threadPool;
};