Re: Question about service programs

Hi Charles,

The typical way to do this is to submit a "never-ending program" to run in a batch subsystem. Then, communicate with this never-ending program using data queues.

Having said that -- it might be worth mentioning that the system only has one copy of your program, it won't load the service program code multiple times into memory. However, it WILL provide multiple instances of the variables, etc, used by the service program. So basically, all jobs share the same executable code, but have their own variables, open files, etc.

But if you want everything shared -- the variables, files, etc.. the easiest way is with the data queue approach that I mentioned above. Many folks use this approach to improve performance by reducing the number of times something has to be "loaded" or "opened".


Charles St-Laurent wrote:

Hi!
I wonder if what I want to do is possible on iSeries (V5R4).
I want to load many service programs in a kind of shared memory and then use
the loaded service programs from interactive or batch jobs, so the loaded
programs won't be loaded each time I start a new batch or interactive job
that wants to use them.
For example:
1) I load all my service programs once and initialize them correctly
2a) I submit a job and I want the submitted job to use the loaded service
programs that have been loaded previously and passing them parameters
2b) I launch an interactive job and I want this interactive job to use
service programs that have been loaded previously and passing them
parameters
I read about activation groups. Activation groups are effective within the
same job. But in my case, I also want to use persistent programs between
jobs (each batch job is a new job and I don't want my service programs to be
allocated/released each time). I want my batch jobs to execute previously
loaded service programs, each time with different parameter values.

Charles St-Laurent
Consultant Berco
Technologies
Industrielle Alliance, Assurance auto et habitation Téléphone : 418 650-4600, poste 3216
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Courriel : charles.st-laurent@xxxxxxx <mailto:pcharles.st-laurent@xxxxxxx> www.inalco.com/assurancegenerale