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

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To: Ray Rashif <schivmeister@...>
Cc: lau <linux-audio-user@...>
Date: Tuesday, October 20, 2009 - 7:47 am

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
atime enabled.

--
James Cameron
http://quozl.linux.org.au/
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Messages in current thread:
[LAU] Test if Linux is ready for audio, Jonathan E. Brickman, (Tue Oct 20, 12:42 am)
Re: [LAU] Test if Linux is ready for audio, Ken Restivo, (Thu Oct 22, 6:18 am)
Re: [LAU] Test if Linux is ready for audio, Scott, (Thu Oct 22, 6:25 am)
Re: [LAU] Test if Linux is ready for audio, Scott Ecker, (Thu Oct 22, 4:19 pm)
Re: [LAU] Test if Linux is ready for audio (realtimeconfigqu..., rosea grammostola, (Thu Oct 22, 4:27 pm)
Re: [LAU] Test if Linux is ready for audio (realtimeconfigqu..., Jonathan E. Brickman, (Thu Oct 22, 10:39 pm)
Re: [LAU] Test if Linux is ready for audio, Ray Rashif, (Tue Oct 20, 1:40 am)
Re: [LAU] Test if Linux is ready for audio, James Cameron, (Tue Oct 20, 7:47 am)
Re: [LAU] Test if Linux is ready for audio, Ray Rashif, (Tue Oct 20, 7:45 am)