Andrew Clausen <[EMAIL PROTECTED]> writes:
> Hi all,
>
> Any comments?From: Paul Barton-Davis <[EMAIL PROTECTED]>
> Subject: [linux-audio-dev] info point on linux hdr
> To: [EMAIL PROTECTED]
> Date: Fri Apr 14 07:10:10 2000 -0500
>
> i mentioned in some remarks to benno how important i thought it was to
> preallocate the files used for hard disk recording under linux.
>
> i was doing more work on ardour yesterday, and had the occasion to
> create some new "tapes", of lengths from 2 to 40 minutes.
>
> the simple act of creating 24 5 minute WAV files on ext2, files in
> which every block has been allocated, takes at least 1 minute, perhaps
> as much as 2. i create the files by first opening them, then writing a
> zero byte every blocksize bytes (blocksize comes from stat(2)), except
> for the WAV header at the beginning.
I'm confused. You wrote what is conceptually 24x5=120 minutes of audio
data in 2 minutes. So you have 60 times the performance you need.
What is the problem?
> i hadn't done this in a while, but it reminded me of the
> near-impossibility of expecting the FS code to allocate this much disk
> space in real time under ext2. If someone knows of a faster way to
> allocate the disk space, please let me know. Its not that I have a
> problem right now, just wanted to point out this behaviour.
If you blocksize was 1k increasing it to 4k could help.
Eric
