Re: [LAD] [LAU] cancelling I/O with libsndfile

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To: Dan Muresan <danmbox@...>
Cc: <linux-audio-dev@...>
Date: Thursday, July 7, 2011 - 2:00 pm

On Thu, Jul 7, 2011 at 9:38 AM, Dan Muresan wrote:

[ ... ]

Dan - I'm really confused by what you're getting at, or trying to get
to. It seems as though you think there is a difference in the
throughput when you read from a filesystem using st_blksize or some
other size close to it, and that you either have or could measure it.
Erik is saying that he doesn't believe that you could measure the
difference.

The only empirical data I have comes from years ago (maybe 8-9 years
ago) when I measured this with ext2 and possibly 2 other linux
filesystems, and found that the best throughput was obtained using
values very, very far removed from st_blksize. This is why ardour
tries to write in chunks of 256kB, although in truth it would be
better if we measured this again on ext3 and newer FS's, and if
possible provided a run-time measurement.
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Messages in current thread:
Re: [LAD] [LAU] cancelling I/O with libsndfile, Erik de Castro Lopo, (Tue Jun 14, 12:15 am)
Re: [LAD] [LAU] cancelling I/O with libsndfile, Dan Muresan, (Tue Jun 14, 7:09 am)
Re: [LAD] [LAU] cancelling I/O with libsndfile, Erik de Castro Lopo, (Tue Jun 14, 7:30 am)
Re: [LAD] [LAU] cancelling I/O with libsndfile, Dan Muresan, (Tue Jun 14, 7:49 am)
Re: [LAD] [LAU] cancelling I/O with libsndfile, Erik de Castro Lopo, (Tue Jun 14, 8:44 am)
Re: [LAD] [LAU] cancelling I/O with libsndfile, Dan Muresan, (Tue Jun 14, 10:01 am)
Re: [LAD] [LAU] cancelling I/O with libsndfile, Fons Adriaensen, (Tue Jun 14, 11:21 am)
Re: [LAD] [LAU] cancelling I/O with libsndfile, Dan Muresan, (Tue Jun 14, 11:42 am)
Re: [LAD] [LAU] cancelling I/O with libsndfile, Fons Adriaensen, (Tue Jun 14, 12:12 pm)
Re: [LAD] [LAU] cancelling I/O with libsndfile, Dan Muresan, (Tue Jun 14, 12:55 pm)
Re: [LAD] [LAU] cancelling I/O with libsndfile, Erik de Castro Lopo, (Tue Jun 14, 10:54 am)
Re: [LAD] [LAU] cancelling I/O with libsndfile, Dan Muresan, (Mon Jun 20, 9:51 pm)
Re: [LAD] [LAU] cancelling I/O with libsndfile, Erik de Castro Lopo, (Mon Jun 20, 10:52 pm)
Re: [LAD] [LAU] cancelling I/O with libsndfile, Dan Muresan, (Tue Jun 21, 6:24 am)
Re: [LAD] [LAU] cancelling I/O with libsndfile, Erik de Castro Lopo, (Tue Jun 21, 6:37 am)
Re: [LAD] [LAU] cancelling I/O with libsndfile, Dan Muresan, (Tue Jun 21, 6:57 am)
Re: [LAD] [LAU] cancelling I/O with libsndfile, Erik de Castro Lopo, (Tue Jun 21, 7:12 am)
Re: [LAD] [LAU] cancelling I/O with libsndfile, Dan Muresan, (Tue Jun 21, 7:50 am)
Re: [LAD] [LAU] cancelling I/O with libsndfile, Erik de Castro Lopo, (Tue Jun 21, 7:58 am)
Re: [LAD] [LAU] cancelling I/O with libsndfile, Dan Muresan, (Mon Jul 4, 11:58 am)
Re: [LAD] [LAU] cancelling I/O with libsndfile, Erik de Castro Lopo, (Mon Jul 4, 11:30 pm)
Re: [LAD] [LAU] cancelling I/O with libsndfile, Dan Muresan, (Tue Jul 5, 5:15 am)
Re: [LAD] [LAU] cancelling I/O with libsndfile, Erik de Castro Lopo, (Tue Jul 5, 5:30 am)
Re: [LAD] [LAU] cancelling I/O with libsndfile, Dan Muresan, (Tue Jul 5, 9:42 am)
Re: [LAD] [LAU] cancelling I/O with libsndfile, Erik de Castro Lopo, (Tue Jul 5, 10:25 am)
Re: [LAD] [LAU] cancelling I/O with libsndfile, Dan Muresan, (Tue Jul 5, 11:17 am)
Re: [LAD] [LAU] cancelling I/O with libsndfile, Erik de Castro Lopo, (Tue Jul 5, 11:29 am)
Re: [LAD] [LAU] cancelling I/O with libsndfile, Dan Muresan, (Thu Jul 7, 1:38 pm)
Re: [LAD] [LAU] cancelling I/O with libsndfile, Paul Davis, (Thu Jul 7, 2:00 pm)
Re: [LAD] [LAU] cancelling I/O with libsndfile, Dan Muresan, (Thu Jul 7, 2:29 pm)
Re: [LAD] [LAU] cancelling I/O with libsndfile, Paul Davis, (Thu Jul 7, 2:39 pm)
Re: [LAD] [LAU] cancelling I/O with libsndfile, Dan Muresan, (Thu Jul 7, 3:39 pm)
Re: [LAD] [LAU] cancelling I/O with libsndfile, Dan Muresan, (Tue Jun 14, 12:03 pm)