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#include #include #include #include int main(int argc, char** argv) { int size = std::stoi(argv[1]); std::vector> data(size, std::vector(size)); struct timeval b; gettimeofday(&b, nullptr); # 按列遍历，避免 CPU cache 的影响 for (int col = 0; col < size; ++col) { for (int row = 0; row < size; ++row) { data[row][col] = rand(); } } struct timeval e; gettimeofday(&e, nullptr); std::cout << "Use time " << e.tv_sec * 1000000 + e.tv_usec - b.tv_sec * 1000000 - b.tv_usec << "us" << std::endl; } # numactl --cpubind=0 --membind=0 ./numa_test 20000 Use time 16465637us # numactl --cpubind=0 --membind=1 ./numa_test 20000 Use time 21402436us