Re: Here is the results of my last question...

[Russell Cattelan <cattelan@xxxxxxxxxxx>]

On Fri, 2002-10-25 at 14:49, Chris Wedgwood wrote:
> On Fri, Oct 25, 2002 at 08:27:27PM +0200, Andi Kleen wrote:
> 
> > The right thing would be to change the downloader assistant to use
> > XFS' file preallocation ioctls so that it allocates the full space
> > in advance. Unfortuately they are not fully implemented on linux/xfs
> > and are only available for root currently. I would be possible to
> > create the file first and fill it with zeroes. This way you should
> > get few extents.
> 
> It would be pretty cheap for the downloader to actually just touch
> lseek/touch ahead a few MB of each writer too, this would be almost as
> easy to code and would work on other filesystems.
That would just create a file with a hole, and holes are filled in the
same way appends are filled in.


> 
> 
>   --cw
>