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March 2000, Week 1

HP3000-L@RAVEN.UTC.EDU

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From:
"VANCE,JEFF (HP-Cupertino,ex1)" <[log in to unmask]>
Reply To:
VANCE,JEFF (HP-Cupertino,ex1)
Date:
Fri, 3 Mar 2000 12:35:27 -0800
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Hi,
(I've cc'd Craig as the authority on this subject)
...
> > Yes, MPE now deals with 4096 byte pages in and out of
> > memory.  Obviously, the more you can get in each 4096 disk read,
> > the better.  When you make files for efficiency, set the blocking
> > factor to 4096 / record size of the file in bytes rounded down to
> >get the best....

> Thanks!
>
> If the above is true, then what's the chance that CSY could
> update their routine so that the default blocking factor uses the
> above logic?  Of whom should I this question?  Jeff?  Donna (or one
> of the other SIG leaders)?
>
> Ted

From what I know the blocking factor does not matter for disk files
because MPE reads and pre-fetches their contents into memory and then
just moves bytes from a memory buffer to your stack.  However I seem
to recall some cases where it may matter, but I am sorry to say I
have forgotten the details.

Jeff Vance, CSY

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