Re: What About Price vs. Performance?

["Leif Svalgaard" <leif@xxxxxxxx>]

From: M. Lazarus <mlazarus@ttec.com>
> >No, but I wrote my first screen handler for the AS/400 on a B30
> >back in 1989. I have here in front of me my log book from that
> >time. I did a timing test of building/displaying a screen (worst
> >case - full of fields and data). My log book entry for 1989/4/20
> >says 46msec. On the 150, that same screen takes only 1.35msec,
> >so there has been *some* progress.
> 
>   Was this driver written in MI?  That may account for the differences.
> 

Yes, I should have mentioned that. At the time I wrote the first driver
in COBOL (and a part in RPG II). The time to generate the 5250 data
stream was 276msec for the COBOL version. That was totally 
unacceptable to my client who needed to support a user population
of about 100. So I had to learn MI. In fact the screen driver was my
FIRST MI-program (took one week to write, was 1000 lines, and
worked the first time - attesting to the naturalness of MI for this
kind of thing). The display file was USERDEF. If you use a DDS
described file you are measuring how long OS/400 takes to 
generate the 5250 data stream. This I found to be typically
2 times slower. Presumably the OS/400 5250-data stream
generator also uses a more efficient language than RPG for this.
PL/S, Pascal, or Modula?? or now maybe C? who knows.

 


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