C++ ビッグ データ開発で読み取りおよび書き込み操作を最適化するにはどうすればよいですか?

#include <iostream>
#include <fstream>
#include <sys/mman.h>
#include <fcntl.h>
#include <unistd.h>

#define FILE_SIZE 1024*1024*1024  // 1GB

int main() {
    int fd = open("data.bin", O_RDWR | O_CREAT | O_TRUNC, 0666);
    if (fd == -1) {
        std::cout << "Failed to open file!" << std::endl;
        return -1;
    }
    int res = lseek(fd, FILE_SIZE - 1, SEEK_SET);
    if (res == -1) {
        std::cout << "Failed to lseek!" << std::endl;
        close(fd);
        return -1;
    }
    res = write(fd, "", 1);
    if (res != 1) {
        std::cout << "Failed to write!" << std::endl;
        close(fd);
        return -1;
    }
    char* data = (char*) mmap(NULL, FILE_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
    if (data == MAP_FAILED) {
        std::cout << "Failed to mmap!" << std::endl;
        close(fd);
        return -1;
    }
    // 对于大数据文件进行读写操作
    strcpy(data, "Hello, World!");  // 写入数据
    std::cout << data << std::endl;  // 读取数据
    // 释放内存映射
    res = munmap(data, FILE_SIZE);
    if (res == -1) {
        std::cout << "Failed to munmap!" << std::endl;
        close(fd);
        return -1;
    }
    close(fd);
    return 0;
}

#include <iostream>
#include <fstream>
#include <vector>
#include <algorithm>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <aio.h>
#include <unistd.h>
#include <string.h>

#define BUFFER_SIZE 1024

void read_callback(sigval_t sigval) {
    aiocb* aio = (aiocb*)sigval.sival_ptr;
    int res = aio_error(aio);
    if (res != 0) {
        std::cout << "Failed to read!" << std::endl;
    } else {
        std::cout << aio->aio_buf << std::endl;  // 输出读取的数据
    }
    aio_result(aio);
    delete aio;
}

void write_callback(sigval_t sigval) {
    aiocb* aio = (aiocb*)sigval.sival_ptr;
    int res = aio_error(aio);
    if (res != 0) {
        std::cout << "Failed to write!" << std::endl;
    }
    aio_result(aio);
    delete aio;
}

void async_read_write(const char* from, const char* to) {
    int input_fd = open(from, O_RDONLY);
    int output_fd = open(to, O_WRONLY | O_CREAT | O_TRUNC, 0666);
    
    std::vector<char> buffer(BUFFER_SIZE);
    aiocb* aio_read = new aiocb{};
    aio_read->aio_fildes = input_fd;
    aio_read->aio_buf = buffer.data();
    aio_read->aio_nbytes = BUFFER_SIZE;
    aio_read->aio_offset = 0;
    aio_read->aio_lio_opcode = LIO_READ;
    aio_read->aio_sigevent.sigev_notify = SIGEV_THREAD;
    aio_read->aio_sigevent.sigev_notify_function = read_callback;
    aio_read->aio_sigevent.sigev_value.sival_ptr = aio_read;
    
    aiocb* aio_write = new aiocb{};
    aio_write->aio_fildes = output_fd;
    aio_write->aio_buf = buffer.data();
    aio_write->aio_nbytes = BUFFER_SIZE;
    aio_write->aio_offset = 0;
    aio_write->aio_lio_opcode = LIO_WRITE;
    aio_write->aio_sigevent.sigev_notify = SIGEV_THREAD;
    aio_write->aio_sigevent.sigev_notify_function = write_callback;
    aio_write->aio_sigevent.sigev_value.sival_ptr = aio_write;
    
    std::vector<aiocb*> aiocb_list = {aio_read, aio_write};
    lio_listio(LIO_WAIT, aiocb_list.data(), aiocb_list.size(), nullptr);
    
    close(input_fd);
    close(output_fd);
}

int main() {
    async_read_write("data.bin", "data_copy.bin");
    return 0;
}