Re: RPG III to RPG IV

[Michael Calabro/commsoft<mcalabro@xxxxxxxxxxxx>]

>Since few monthes we plane to translate ours old RPG III programs
>to RPGIV, but ....
>
>    - What about performance, especially for interactive programs,
> do they need more memorie ?
>    - What about disk space (objets and sources) ?
>    - Other problems ????
>
>Do anybody have experience on it ?

Eric,
I have some small amount of experience with a mixed environment of RPG III 
and RPG IV.  I would say that generally the performance and storage 
requirements 
are about the same UNLESS you start using named activation groups (ILE) 
Starting an activation group costs about as much CPU as starting a new job, 
so 
you need to be careful there.  Also, bind by copy will take up more disk 
storage 
than bind by reference does.  I am not using named AGs here, except for 
QILE.
Also, we don't have a standard for binding service programs yet, so I have 
not 
deployed any into the field (only for my own tool kit.)

I would advise you to convert a few of your RPG III programs to RPG IV only 
for your
education.  Unless you have exquisite RPG III code, you will not be taking 
advantage
of RPG IV by converting.  You will get the best value by writing new code 
in RPG IV
rather than converting old code.

If you have experience with C, you will easily get used to prototyped 
procedures.
I feel that these have given me the best value for my time to learn them. 
There
is a poster on RPG400-L who is very advanced compared to me; perhaps
he can answer some of your questions better than I can.

Bonne chance!
Good luck!

Buck Calabro
CommSoft, Albany, NY
mailto:mcalabro@commsoft.net

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