Re: Linkage convention

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#202

From: Bill Fairchild
Date: Mon, 17 Oct 2005 16:12

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In a message dated 10/1/2005 9:30:17 A.M. Central Daylight Time,
bob.shannon@rocketsoftware.com writes:

>... establishing a software stack for saveareas/workareas that will
eliminate the need >for Getmains...
I think this is a solution in search of a problem.  22 years  ago I wrote an
ASM program that used GETMAIN to build a very large number of  fairly small
control blocks.  Thinking that there was too much overhead  using the ancient
SVC form of GETMAIN (this was before the PC form was  invented), I changed the
code to do a single huge GETMAIN at the beginning and  then do my own
suballocation.  I ran some benchmarks and found a  negligible difference in CPU time.

The GETMAIN code has been rock solid for decades, and has also been  highly
optimized in its execution paths.  If you need to do tens  of thousands of
GETMAINs per second in disabled code, then maybe you  might want to think about
eliminating them.

But if you have well-debugged infrastructure code to use software  stacks, by
all means use it.  But don't bother trying to build  your own such code.  I
don't think it's worth the  development/debug/support effort.  And you can
reduce the overhead of  GETMAINs by using the PC entry form rather than the SVC
form.

Bill Fairchild

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From: Bill Fairchild <DASDBill2@aol.com>
Newsgroups: bit.listserv.asm370
Subject: Re: Linkage convention
Date: Mon, 17 Oct 2005 12:12:23 EDT
Organization: SAS Inc.
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