小编Oll*_*ivi的帖子

我正在测试读取多个数据流如何影响CPU缓存性能.我正在使用以下代码来对此进行基准测试.基准测试读取顺序存储在内存中的整数,并按顺序写入部分和.从中读取的顺序块的数量是变化的.来自块的整数以循环方式读取.

#include <iostream>
#include <vector>
#include <chrono>
using std::vector;
void test_with_split(int num_arrays) {
    int num_values = 100000000;
    // Fix up the number of values. The effect of this should be insignificant.
    num_values -= (num_values % num_arrays);
    int num_values_per_array = num_values / num_arrays;
    // Initialize data to process
    auto results = vector<int>(num_values);
    auto arrays = vector<vector<int>>(num_arrays);
    for (int i = 0; i < num_arrays; ++i) {
        arrays.emplace_back(num_values_per_array);
    }
    for (int i = 0; i < num_values; ++i) {
        arrays[i%num_arrays].emplace_back(i);
        results.emplace_back(0);
    } …