如何提高C++大数据开发中的数据迁移速度?

#include <iostream>
#include <vector>

int main() {
    std::vector<int> sourceData = {1, 2, 3, 4, 5}; // 原始数据
    std::vector<int> targetData(sourceData.size()); // 目标数据

    // 使用循环将原始数据迁移到目标数据中
    for (int i = 0; i < sourceData.size(); i++) {
        targetData[i] = sourceData[i];
    }

    // 输出目标数据
    for (int i = 0; i < targetData.size(); i++) {
        std::cout << targetData[i] << " ";
    }
    std::cout << std::endl;

    return 0;
}

#include <iostream>
#include <vector>

void doDataMigration(std::vector<int>& sourceData, std::vector<int>& targetData) {
    // 使用引用传递避免数据拷贝
    for (int i = 0; i < sourceData.size(); i++) {
        targetData[i] = sourceData[i];
    }
}

int main() {
    std::vector<int> sourceData = {1, 2, 3, 4, 5}; // 原始数据
    std::vector<int> targetData(sourceData.size()); // 目标数据

    // 调用函数进行数据迁移
    doDataMigration(sourceData, targetData);

    // 输出目标数据
    for (int i = 0; i < targetData.size(); i++) {
        std::cout << targetData[i] << " ";
    }
    std::cout << std::endl;

    return 0;
}

#include <iostream>
#include <vector>
#include <future>

void doDataMigration(std::vector<int>& sourceData, std::vector<int>& targetData, int start, int end) {
    for (int i = start; i < end; i++) {
        targetData[i] = sourceData[i];
    }
}

int main() {
    std::vector<int> sourceData = {1, 2, 3, 4, 5}; // 原始数据
    std::vector<int> targetData(sourceData.size()); // 目标数据

    int numThreads = std::thread::hardware_concurrency(); // 获取可用的CPU核心数
    int chunkSize = sourceData.size() / numThreads; // 每个线程处理的数据大小

    std::vector<std::future<void>> futures;
    for (int i = 0; i < numThreads; i++) {
        int start = i * chunkSize;
        int end = (i == numThreads - 1) ? sourceData.size() : (i + 1) * chunkSize;
        futures.push_back(std::async(doDataMigration, std::ref(sourceData), std::ref(targetData), start, end));
    }

    // 等待所有线程完成
    for (auto& future : futures) {
        future.wait();
    }

    // 输出目标数据
    for (int i = 0; i < targetData.size(); i++) {
        std::cout << targetData[i] << " ";
    }
    std::cout << std::endl;

    return 0;
}