Right on.
Which is why I try to advise developers that there is nothing backward
about writing the same old dynamic calls to perform a task.
But many treat *SRVPGMs just like they do with SQL where, once bitten,
attempt to shoe-horn all code into embedded SQL requests, and likewise
wityh ILE, they engineer what can turn out to be a complex build to
generate a *SRVPGM that will only ever be used by the calling program.
It's a horses for courses thing.
My advice is, don't write a *SRVPGM unless the design needs and will
benefit from one.
I think there are many RPG'ers who delude themselves by attempting to
write code they think will be so generic that the world will beat a path
to use it, and they must use *SRVPGMs to prove this.
Peter
-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Scott Klement
Sent: Wednesday, 25 February 2009 8:19 a.m.
To: RPG programming on the IBM i / System i
Subject: Re: Bind by reference doesn't mean dynamic call?
David,
Having a problem explaining to colleagues in a world without service
programs that using them does not mean dynamic calls and thus poor
performance.
I think it's a mistake to try to sell service programs as a technology
based on performance. The performance difference between a dynamic call
and a bound-by-reference call is so slight that it's never likely to
matter.
If I understand correctly, the first call is akin to being dynamic,
but afterwards the link between program and service program is static
and therefore as fast as a module bound by copy.
This seems to be discussing whether the program is reactivated on each
call or not. That doesn't depend on whether it's a dynamic or static
call, instead it depends on how the program is activated.
In ILE, a program remains activated until it's activation group is
reclaimed (either explicitly or automatically.) In OPM it remains
activated until it ends with LR turned on.
Programs that remain activated will call very quickly, as they're
already loaded into memory, already activated, may still have their
files open, etc, etc.
Anyone help me out in simple English?
In simple English:
Advantage to ILE is maintainability, not performance.
--
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