Re: ILE --OPM

[Vernon Hamberg <vhamberg@xxxxxxxxxxx>]

Donna

I think your mileage will vary, but it's generally a good idea to 
move to ILE, even with CL. I read some estimate once, think it was 
either 20% improvement or 20% of the runtime.

Having said that, if you call IBM stuff, it might not have all the 
benefit when those calls go to OPM programs - there are still a lot 
of them out there.

Also, CL is typically not the major part of your apps - unless you 
are doing file IO in there - RPG is better for that. So improvement 
there will not have as much impact as fixing up the RPG stuff. Just 
going to ILE won't solve problems of missing indexes, needlessly 
repetitive code, etc. Performance tools can help, or some of the 
stuff from Centerfield Technology.

Some of the benefits of ILE have more to do with ease and reliability 
of development, not so much with application runtime. But combining 
often called routines into a service program and binding can be good, 
because a dynamic call is expensive (a regular program call) as 
compared to a call to a procedure.

I'd look elsewhere though for performance improvements - unless 
everything you do is in CL - go to ILE then - the native environment 
of the iSeries is ILE - OPM calls have to be thunked - takes time.

HTH
Vern

At 03:56 PM 10/28/2007, you wrote:

> I understood that  this topic has  been debated several times in 
> this forum, I 've gone through couple of posts related to this 
> topic. However I would like to get some answers on my below  question.
>   We are currently experiencing lots of delays in batch processing 
> (interactive jobs), we noticed some programs are coded in OPM.Basic 
> objective is to bring down the run time for programs to less than 
> what it takes now for these programs, we have started converting 
> into ILE for some of the important OPM programs.
>   I understood that ILE runs faster than OPM.
>
>   1)I would like to know with respect to what functionalities ILE 
> RPG/ILE CL runs faster than OPM? We would like to implement those 
> funationalities when converting OPM to ILE.
>   2)By improving what functaionalities the existing ILE programs 
> can be made run faster?
>   We would like to implement those functionalities to speed up 
> existing ILE programs.
> We are on V5R3. Not sure what are new IBM recommendations.
>
>   Donna Lester
>
>
>
>
> Thanks,
>
> Donna.
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