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Operating Systems Linux Red Hat Access time of files and directories Post 302771475 by alister on Wednesday 20th of February 2013 06:40:42 PM
Old 02-20-2013
Quote:
Originally Posted by lupin..the..3rd
"noatime" is a commonly used one to improve filesystem performance. It improves performance by not recording the access time.
To be more precise, it does not update the access time when a file is read. atime is still updated when a file is written to.

Without noatime, even a read handled by the page cache would require a disk write.

Regards,
Alister
 

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touch(1B)					     SunOS/BSD Compatibility Package Commands						 touch(1B)

NAME
touch - change file access and modification times SYNOPSIS
/usr/ucb/touch [-acfm] file... DESCRIPTION
touch sets the access and modification times of each file to the current time. file is created if it does not already exist. OPTIONS
-a Change the access time of file. Do not change the modification time unless -m is also specified. -c Do not create file if it does not exist. -f Attempt to force the touch in spite of read and write permissions on file. -m Change the modification time of file. Do not change the access time unless -a is also specified. USAGE
See largefile(5) for the description of the behavior of touch when encountering files greater than or equal to 2 Gbyte ( 2^31 bytes). EXIT STATUS
The following exit values are returned: 0 touch executed successfully and all requested changes were made. >0 An error occurred. touch returns the number of files for which the times could not be successfully modified. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscpu | +-----------------------------+-----------------------------+ SEE ALSO
touch(1), attributes(5), largefile(5) SunOS 5.11 26 Oct 1995 touch(1B)
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