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Operating Systems Solaris Zfs - what does atime update? Post 302954586 by Peasant on Wednesday 9th of September 2015 07:17:51 AM
Old 09-09-2015
By using stat command, you can see that information.

Code:
# stat somefile.txt
  File: `somefile.txt'
  Size: 9               Blocks: 2          IO Block: 512    regular file
Device: 475001dh/74776605d      Inode: 1161        Links: 1
Access: (0664/-rw-rw-r--)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2015-09-09 13:14:00.384836768 +0200
Modify: 2015-09-09 13:14:00.385346153 +0200
Change: 2015-09-09 13:14:00.385994348 +0200

If you change atime to off, the Access part will not be update when you access the file and you will gain minor to none performance depending on the filesystem structure.

Hope that helps
Regards
Peasant.
 

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FILEMTIME(3)								 1							      FILEMTIME(3)

filemtime - Gets file modification time

SYNOPSIS
int filemtime (string $filename) DESCRIPTION
This function returns the time when the data blocks of a file were being written to, that is, the time when the content of the file was changed. PARAMETERS
o $filename - Path to the file. RETURN VALUES
Returns the time the file was last modified, or FALSE on failure. The time is returned as a Unix timestamp, which is suitable for the date(3) function. EXAMPLES
Example #1 filemtime(3) example <?php // outputs e.g. somefile.txt was last modified: December 29 2002 22:16:23. $filename = 'somefile.txt'; if (file_exists($filename)) { echo "$filename was last modified: " . date ("F d Y H:i:s.", filemtime($filename)); } ?> ERRORS
/EXCEPTIONS Upon failure, an E_WARNING is emitted. NOTES
Note Note that time resolution may differ from one file system to another. Note The results of this function are cached. See clearstatcache(3) for more details. Tip As of PHP 5.0.0, this function can also be used with some URL wrappers. Refer to "Supported Protocols and Wrappers" to determine which wrappers support stat(3) family of functionality. SEE ALSO
filectime(3), stat(3), touch(3), getlastmod(3). PHP Documentation Group FILEMTIME(3)
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