Re: What is the overhead of using system built-in's

["Mark S. Waterbury" <mark_s_waterbury@xxxxxxxxx>]

Hello, Njal:

The only "overhead" is the overhead of starting the "wrapper"
ILE *PGM (CBLLE, CLLE, CLE, or RPGLE).  All of these
"built-in" functions generate "in-line" code, wherever possible.
Of course, some MI instructions are like "macro instructions"
in that they do a lot of work, and the code they generate actually
jumps to some routine inside the OS/400 kernel, via the SEPT,
but this would happen even if you write a routine directly in MI
assembler.  So, you are no worse off...

Assuming the "main" application is written in an ILE language,
and you can issue the MI instruction via a "built-in" declaration,
then you can incorporate this directly in your application, and
you should be able to get the "best possible" performance
in this way.

Regards,

Mark S. Waterbury

----- Original Message -----
From: "Njål Fisketjøn" <n.f@figu.no>
To: "MI400@midrange. com" <MI400@midrange.com>
Sent: Friday, August 03, 2001 2:30 PM
Subject: What is the overhead of using system built-in's


> What is the overhead of using system built-in's (e.g. in ILE RPG)
> in stead of MI?
>
> With the ability to run many MI functions directly from any ILE language
> it's tempting to use system built-ins as some kind of "inline MI".
>
> Does anyone know how much this will impact performance?
>
>
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