On Tue, Oct 20, 2009 at 09:39:50AM +0800, Ray Rashif wrote:
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.
Another method is to place these files in a separate filesystem with
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