Bagaimana untuk meningkatkan kelajuan pemisahan data dalam pembangunan data besar C++?

#include <iostream>
#include <vector>
#include <thread>

// 数据拆分函数，将数据拆分为多个子块
std::vector<std::vector<int>> splitData(const std::vector<int>& data, int numThreads) {
    int dataSize = data.size();
    int blockSize = dataSize / numThreads; // 计算每个子块的大小

    std::vector<std::vector<int>> result(numThreads);
    std::vector<std::thread> threads;

    // 创建多个线程进行数据拆分
    for (int i = 0; i < numThreads; i++) {
        threads.push_back(std::thread([i, blockSize, &result, &data]() {
            int start = i * blockSize;
            int end = start + blockSize;

            // 将数据拆分到对应的子块中
            for (int j = start; j < end; j++) {
                result[i].push_back(data[j]);
            }
        }));
    }

    // 等待所有线程结束
    for (auto& thread : threads) {
        thread.join();
    }

    return result;
}

int main() {
    std::vector<int> data = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};

    std::vector<std::vector<int>> result = splitData(data, 4);

    // 输出拆分后的结果
    for (const auto& subData : result) {
        for (int num : subData) {
            std::cout << num << " ";
        }
        std::cout << std::endl;
    }

    return 0;
}

#include <iostream>
#include <vector>
#include <algorithm>
#include <execution>

// 数据拆分函数，将数据拆分为多个子块
std::vector<std::vector<int>> splitData(const std::vector<int>& data, int numThreads) {
    int dataSize = data.size();
    int blockSize = dataSize / numThreads; // 计算每个子块的大小

    std::vector<std::vector<int>> result(numThreads);

    // 使用并行算法进行数据拆分
    std::for_each(std::execution::par, data.begin(), data.end(), [blockSize, &result](int num) {
        int threadId = std::this_thread::get_id() % std::thread::hardware_concurrency();
        result[threadId].push_back(num);
    });

    return result;
}

int main() {
    std::vector<int> data = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};

    std::vector<std::vector<int>> result = splitData(data, 4);

    // 输出拆分后的结果
    for (const auto& subData : result) {
        for (int num : subData) {
            std::cout << num << " ";
        }
        std::cout << std::endl;
    }

    return 0;
}