加载前评估文件在R中的大小(它将占用多少RAM)

问题描述

我想知道是否有一些函数可以给定文件名+路径来评估使用它需要多少RAM R?我希望能够在加载之前知道此信息.

I was wondering if there's some function that given a file name + path can asses how much RAM R will need to use it? i want to be able to know this info before I'm loading it.

推荐答案

您可以使用'fstat' http://linux.die.net/man/2/fstat

You can use 'fstat'http://linux.die.net/man/2/fstat

它将报告有关文件的信息，例如实际文件大小.

It will report information about your file, such as actual filesize.

struct stat {
    dev_t     st_dev;     /* ID of device containing file */
    ino_t     st_ino;     /* inode number */
    mode_t    st_mode;    /* protection */
    nlink_t   st_nlink;   /* number of hard links */
    uid_t     st_uid;     /* user ID of owner */
    gid_t     st_gid;     /* group ID of owner */
    dev_t     st_rdev;    /* device ID (if special file) */
    off_t     st_size;    /* total size, in bytes */
    blksize_t st_blksize; /* blocksize for file system I/O */
    blkcnt_t  st_blocks;  /* number of 512B blocks allocated */
    time_t    st_atime;   /* time of last access */
    time_t    st_mtime;   /* time of last modification */
    time_t    st_ctime;   /* time of last status change */
};

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