RE: buffering

["Richard Jackson" <richardjackson@xxxxxxxxxxxxxxxxxx>]

I'm a'fraid that I have a copy myself ... :)  By the way, did you ever
notice that the sample program in that article didn't compile?  I figured it
out about three days after my public copy arrived.

Richard Jackson
mailto:richardjackson@richardjackson.net
http://www.richardjacksonltd.com
Voice: 1 (303) 808-8058
Fax:   1 (303) 663-4325

-|-----Original Message-----
-|From: owner-mi400@midrange.com [mailto:owner-mi400@midrange.com]On
-|Behalf Of Leif Svalgaard
-|Sent: Sunday, October 08, 2000 6:48 AM
-|To: MI400@midrange.com
-|Subject: Re: buffering
-|
-|
-|Thanks Richard,
-|The info about the option for blocking was just what I needed.
-|I hope the discussion has also been useful to other people listening
-|in on the list.
-|I also have the PRPQ manual, even an 8-inch diskette with the
-|compiler. Does me little good these days.
-|My first introduction to MI was Richards article in NEWS/38.
-|I still have a frayed copy of it.
-|
-|----- Original Message -----
-|From: Richard Jackson <richardjackson@richardjackson.net>
-|To: <MI400@midrange.com>
-|Sent: Sunday, October 08, 2000 12:32 AM
-|Subject: RE: buffering
-|
-|
-|> No pain, no gain.  Except for the System/38-to-RISC hacking, I think we
-|have
-|> the right stuff here.  Create an RPG program to use as a
-|stalking horse for
-|> offsets and I think we have it.  The block size settings are made as
-|> structures tagged onto the end of the UFCB before QDMCOPEN is
-|called.  The
-|> trick is that the data structures are documented in the data
-|areas manual
-|on
-|> the override structure and not documented on the UFCB
-|structure.  It took
-|me
-|> half an hour to remember that.  I'm getting old and stupid.
-|>
-|> In 1984, my first MI program was an MI compiler.  It loaded data from a
-|file
-|> into a user space then called the PRM.  My version used blocked
-|record IO
-|> and supported conditional nested include files, like C.  It was
-|fairly fast
-|> .... :)  I never used more than one level of include after that but the
-|> education was fun.  It t'were a bit harder to write MI in those
-|days that
-|it
-|> is now - no documentation except the PRPQ manual and one had to sign
-|license
-|> and confidentiality agreements to get more information.  My "assistance"
-|> contact was a private arrangement - he retired from IBM just last April.
-|>
-|> Richard Jackson
-|> mailto:richardjackson@richardjackson.net
-|> http://www.richardjacksonltd.com
-|> Voice: 1 (303) 808-8058
-|> Fax:   1 (303) 663-4325
-|>
-|> -|-----Original Message-----
-|> -|From: owner-mi400@midrange.com [mailto:owner-mi400@midrange.com]On
-|> -|Behalf Of Don
-|> -|Sent: Saturday, October 07, 2000 9:15 PM
-|> -|To: MI400 List
-|> -|Subject: Re: buffering
-|> -|
-|> -|Leif,
-|> -|
-|> -|Out of curiosity, why are you doing all this torture?  :)
-|> -|
-|> -|Don
-|> -|
-|> -|On Sat, 7 Oct 2000, Leif Svalgaard wrote:
-|> -|
-|> -|> As part of my ongoing investigation of sorting large files,
-|> -|> I'm reading the files myself into storage to sort them there.
-|> -|> I have a question about buffering. It doesn't make sense
-|> -|> that it takes 15 minutes to read 10Mb (1,000,000 records
-|> -|> of 10 bytes each), so I must not have the right buffering
-|> -|> set up. What controls that? I was under the (mistaken ?)
-|> -|> impression that suitable buffering was done by OS/400
-|> -|> so I don't have to worry about it. If that's the case, it
-|> -|> is doing a poor job. More likely, I need to do something
-|> -|> to get better buffering. What?
-|> -|>
-|> -|> Leif Svalgaard
-|
-|
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