Re: [LAU] Test if Linux is ready for audio

2009/10/20 James Cameron <quozl@email-addr-hidden>

> On Tue, Oct 20, 2009 at 09:39:50AM +0800, Ray Rashif wrote:
> > 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.
> > I use relatime: http://kerneltrap.org/node/14148
>
> Another method is to place these files in a separate filesystem with
> atime enabled.

I actually meant to type "read from", but thanks for correcting :)

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Received on Tue Oct 20 12:15:01 2009