linuxaudio.org

On Tue, Oct 20, 2009 at 09:39:50AM +0800, Ray Rashif wrote:

quoted text
> Since on a Linux system files are written to almost every minute,

> recording atime everytime an access occurs increases the disk I/O.

I'm not sure that is right; the way you put it.
Perhaps you mean "Since on a Linux system files are read from almost

every minute, recording atime every time a read occurs increases the

write disk I/O."
atime on a file is changed whenever the file is read.  The change is

buffered in memory for a while; usually no more than a minute, then is

written out to disk.
So atime causes at least one disk write I/O for a set of disk read I/Os.
It certainly does impact performance ... if it is not needed.
> I need to know access times for some files so I don't quite like that.

quoted text
> I use relatime: http://kerneltrap.org/node/14148

Another method is to place these files in a separate filesystem with

atime enabled.
--

James Cameron

http://quozl.linux.org.au/

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