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 <email@example.com> 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:firstname.lastname@example.org > http://www.richardjacksonltd.com > Voice: 1 (303) 808-8058 > Fax: 1 (303) 663-4325 > > -|-----Original Message----- > -|From: email@example.com [mailto:firstname.lastname@example.org]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 +--- | This is the MI Programmers Mailing List! | To submit a new message, send your mail to MI400@midrange.com. | To subscribe to this list send email to MI400-SUB@midrange.com. | To unsubscribe from this list send email to MI400-UNSUB@midrange.com. | Questions should be directed to the list owner/operator: email@example.com +---
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