Date   : Sat, 09 Sep 2006 08:58:43 +0100
From   : jgh@... (Jonathan Graham Harston)
Subject: Re: Tube File Copying

>Message-ID: <38B971F35D084FFD925544ADB638189E.MAI@...>
 
"Ian Wolstenholme" <BBCMailingList@...> wrote:
> It's been going for 2 hours now although it's only at the stage of
> loading the second 8MB chunk.  I suppose loading each chunk is
> going to get longer and longer as it has to get to the starting point
> in the file each time before reading any data.
 
It shouldn't do.
 
  PROCgbpb(rd%,chn%,data%,8*1024*1024,0)
 
should take the same amount of time as:
 
  PROCgbpb(rd%,chn%,data%,8*1024*1024,8*1024*1024) [1]
 
The filing system just does:
 
  sector=file's_start_sector+(PTR DIV 256)
 
[1] Using PROCgbpb(action, handle, address, number, pointer)
 

-- 
J.G.Harston - jgh@...                - mdfs.net/User/JGH
Sheffield Boundary Review at http://mdfs.net/User/JGH/Docs/Politics/ParlReview