尊龙凯时人生就是搏

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ÔÚ¾ÙÐÐLinuxϵͳµÄÎļþI/OºÍ´æ´¢²Ù×÷ʱ£¬ÓÅ»¯ÏµÍ³µÄÐÔÄÜÊǺÜÊÇÖ÷ÒªµÄ¡£Í¨¹ýÌá¸ßÎļþI/OµÄËÙÂʺʹ洢µÄЧÂÊ£¬¿ÉÒÔ¼ÓËÙϵͳµÄÏìÓ¦ËÙÂʺÍÌáÉýÓû§ÌåÑé¡£±¾ÎĽ«ÏÈÈÝһЩÓÅ»¯LinuxϵͳÎļþI/OºÍ´æ´¢ÐÔÄܵÄÒªÁ죬²¢ÌṩÏêϸµÄ´úÂëʾÀý¡£

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ÎļþϵͳÊÇ´æ´¢Êý¾ÝµÄ×éÖ¯·½·¨£¬Ñ¡ÔñºÏÊʵÄÎļþϵͳ¿ÉÒÔÌá¸ßÎļþI/OÐÔÄܺʹ洢ÐÔÄÜ¡£ÔÚLinuxϵͳÖУ¬³£ÓõÄÎļþϵͳÓÐEXT4¡¢XFS¡¢BtrfsµÈ¡£ÒÔÏÂÊÇÒ»¸öʹÓÃXFSÎļþϵͳµÄʾÀý´úÂ룺

# ×°ÖÃXFSÎļþϵͳ֧³Ö
sudo apt-get install -y xfsprogs

# ½¨ÉèXFSÎļþϵͳ
sudo mkfs.xfs /dev/sdb1

# ¹ÒÔØXFSÎļþϵͳ
sudo mount -t xfs /dev/sdb1 /mnt/data

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ÔÚ¾ÙÐÐÎļþI/O²Ù×÷ʱ£¬Ñ¡ÔñÊʵ±µÄ¶Áд·½·¨Ò²ÊÇÓÅ»¯ÐÔÄܵÄÖ÷Òª°ì·¨¡£ÀýÈ磬½ÓÄÉʹÓûº³åÇøµÄÒªÁì¿ÉÒÔïÔÌ­´ÅÅÌI/OµÄ´ÎÊý£¬Ìá¸ß¶ÁдЧÂÊ¡£ÒÔÏÂÊÇÒ»¸öʹÓûº³åÇø¶ÁдÎļþµÄʾÀý´úÂ룺

#include <stdio.h>

int main() {
    FILE *fp;
    char buffer[1024];

    fp = fopen("data.txt", "rb");
    if (fp == NULL) {
        printf("ÎÞ·¨·­¿ªÎļþ£¡");
        return 1;
    }

    fread(buffer, sizeof(char), sizeof(buffer), fp);

    // ¾ÙÐÐÖݪֲÙ×÷

    fclose(fp);

    return 0;
}

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Òì²½I/OÊÇÒ»ÖÖ¿ÉÌá¸ßÎļþI/OÐÔÄܵÄÒªÁ죬ËüÔÊÐíÓ¦ÓóÌÐòÔÚ¾ÙÐÐÎļþ¶Áд²Ù×÷µÄͬʱִÐÐÆäËûʹÃü¡£Ê¹ÓÃÒì²½I/O¿ÉÒÔïÔÌ­ÛÕ±ÕÆÚ´ýʱ¼ä£¬Ìá¸ßϵͳµÄ²¢·¢ÐÔÄÜ¡£ÒÔÏÂÊÇÒ»¸öʹÓÃÒì²½I/O¶ÁдÎļþµÄʾÀý´úÂ룺

#include <stdio.h>
#include <aio.h>

int main() {
    int fd;
    char buffer[1024];
    struct aiocb aio;

    fd = open("data.txt", O_RDONLY);
    if (fd < 0) {
        printf("ÎÞ·¨·­¿ªÎļþ£¡");
        return 1;
    }

    aio.aio_fildes = fd;
    aio.aio_buf = buffer;
    aio.aio_nbytes = sizeof(buffer);
    aio.aio_offset = 0;

    aio_read(&aio);

    // ¾ÙÐÐÖݪֲÙ×÷

    aio_suspend(&aio, 1, NULL);

    close(fd);

    return 0;
}

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ʹÓøßЧµÄ´æ´¢×°±¸Ò²Äܹ»ºÜºéÁ÷ƽÉÏÌáÉýϵͳµÄÎļþI/OÐÔÄܺʹ洢ÐÔÄÜ¡£ÀýÈ磬ʹÓùÌ̬ӲÅÌ£¨SSD£©È¡´ú¹Å°åµÄ»úеӲÅÌ¿ÉÒÔ´ó·ùÌá¸ß¶ÁдËÙÂÊ¡£ÒÔÏÂÊÇÒ»¸öʹÓÃSSD´æ´¢µÄʾÀý´úÂ룺

#include <stdio.h>

int main() {
    FILE *fp;
    char buffer[1024];

    fp = fopen("/dev/nvme0n1", "rb");
    if (fp == NULL) {
        printf("ÎÞ·¨·­¿ª×°±¸£¡");
        return 1;
    }

    fread(buffer, sizeof(char), sizeof(buffer), fp);

    // ¾ÙÐÐÖݪֲÙ×÷

    fclose(fp);

    return 0;
}

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³ýÁËÑ¡Ôñ¸ßЧµÄ×°±¸Í⣬»¹¿ÉÒÔʹÓø߼¶´æ´¢ÊÖÒÕÀ´½øÒ»²½ÌáÉýÎļþI/OÐÔÄܺʹ洢ÐÔÄÜ¡£ÀýÈ磬ʹÓÃRAID£¨Redundant Array of Independent Disks£©¿ÉÒÔÌá¸ß´ÅÅ̵ÄÈÝ´íÐÔºÍÐÔÄÜ¡£ÒÔÏÂÊÇÒ»¸öʹÓÃRAID 0ºÍRAID 5µÄʾÀý´úÂ룺

# ½¨ÉèRAID 0
sudo mdadm --create /dev/md0 --level=0 --raid-devices=2 /dev/sdb1 /dev/sdc1

# ½¨ÉèRAID 5
sudo mdadm --create --verbose /dev/md0 --level=5 --raid-devices=3 /dev/sdb1 /dev/sdc1 /dev/sdd1

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