八、性能测试

8.1 性能测试代码

#include"ConcurrentAlloc.h"// ntimes 一轮申请和释放内存的次数
// rounds 轮次
void BenchmarkMalloc(size_t ntimes, size_t nworks, size_t rounds)
{std::vector<std::thread> vthread(nworks);std::atomic<size_t> malloc_costtime = 0;std::atomic<size_t> free_costtime = 0;for (size_t k = 0; k < nworks; ++k){vthread[k] = std::thread([&, k]() {std::vector<void*> v;v.reserve(ntimes);for (size_t j = 0; j < rounds; ++j){size_t begin1 = clock();for (size_t i = 0; i < ntimes; i++){//v.push_back(malloc(16));v.push_back(malloc((16 + i) % 8192 + 1));}size_t end1 = clock();size_t begin2 = clock();for (size_t i = 0; i < ntimes; i++){free(v[i]);}size_t end2 = clock();v.clear();malloc_costtime += (end1 - begin1);free_costtime += (end2 - begin2);}});}for (auto& t : vthread){t.join();}//printf("%u个线程并发执行%u轮次，每轮次malloc %u次: 花费：%u ms\n",//nworks, rounds, ntimes, malloc_costtime);cout << nworks << "个线程并发执行" << rounds << "轮次,每轮次malloc"<< ntimes << "次:" << "花费:" << malloc_costtime << "ms" << endl;//printf("%u个线程并发执行%u轮次，每轮次free %u次: 花费：%u ms\n",//	nworks, rounds, ntimes, free_costtime);cout << nworks << "个线程并发执行" << rounds << "轮次,每轮次free"<< ntimes << "次:" << "花费:" << free_costtime << "ms" << endl;//printf("%u个线程并发malloc&free %u次，总计花费：%u ms\n",//	nworks, nworks * rounds * ntimes, malloc_costtime + free_costtime);cout << nworks << "个线程并发malloc&free" << nworks * rounds * ntimes<< "次，总计花费:" << malloc_costtime + free_costtime << "ms" << endl;
}// 单轮次申请释放次数 线程数 轮次
void BenchmarkConcurrentMalloc(size_t ntimes, size_t nworks, size_t rounds)
{std::vector<std::thread> vthread(nworks);std::atomic<size_t> malloc_costtime = 0;std::atomic<size_t> free_costtime = 0;for (size_t k = 0; k < nworks; ++k){vthread[k] = std::thread([&]() {std::vector<void*> v;v.reserve(ntimes);for (size_t j = 0; j < rounds; ++j){size_t begin1 = clock();for (size_t i = 0; i < ntimes; i++){//v.push_back(ConcurrentAlloc(16));v.push_back(ConcurrentAlloc((16 + i) % 8192 + 1));}size_t end1 = clock();size_t begin2 = clock();for (size_t i = 0; i < ntimes; i++){ConcurrentFree(v[i]);}size_t end2 = clock();v.clear();malloc_costtime += (end1 - begin1);free_costtime += (end2 - begin2);}});}for (auto& t : vthread){t.join();}//printf("%u个线程并发执行%u轮次，每轮次concurrent alloc %u次: 花费：%u ms\n",//	nworks, rounds, ntimes, malloc_costtime);cout << nworks << "个线程并发执行" << rounds << "轮次,每轮次concurrent alloc"<< ntimes << "次:" << "花费:" << malloc_costtime << "ms" << endl;//printf("%u个线程并发执行%u轮次，每轮次concurrent dealloc %u次: 花费：%u ms\n",//	nworks, rounds, ntimes, free_costtime);cout << nworks << "个线程并发执行" << rounds << "轮次,每轮次concurrent dealloc"<< ntimes << "次:" << "花费:" << free_costtime << "ms" << endl;//printf("%u个线程并发concurrent alloc&dealloc %u次，总计花费：%u ms\n",//	nworks, nworks * rounds * ntimes, malloc_costtime + free_costtime);cout << nworks << "个线程并发concurrent alloc&dealloc" << nworks * rounds * ntimes<< "次，总计花费:" << malloc_costtime + free_costtime << "ms" << endl;
}int main()
{size_t n = 1000;cout << "==========================================================" << endl;BenchmarkConcurrentMalloc(n, 4, 10);cout << endl << endl;BenchmarkMalloc(n, 4, 10);cout << "==========================================================" << endl;return 0;
}