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  1.  Home
  2. RPG400-L
  3. October 2007

Re: ILE --OPM

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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