On 7/14/2011 8:30 AM, Barkow, Eileen wrote:
The programmer has a question about possible TCB switching:
Option 2 seems better. DATA(31) should allow most of the
callers storage to reside above the line, and switch to
below the line processing only when calling the assembler
routine. Would excessive TCB switching result if the assembler
program is invoked repeatedly for file i/o, or does that not come into play?
Your programmer is mis-speaking. I don't know what "TCB switching" is;
they probably mean AMODE switching. And, yes, there is some penalty
for AMODE switching.
I thought you mentioned the programmer was going to re-write the
Assembler code, in which case it can be setup to be AMODE 31 and
stay that way and there is no such problem.
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@bama.ua.edu] On Behalf Of
Farley, Peter x23353
Sent: Wednesday, July 13, 2011 4:53 PM
To: IBM-MAIN@bama.ua.edu
Subject: Re: running Assembler I/O macro code as AMODE 31, RMODE ANY
Option #1 is simpler, that is true. I also forgot to say that the COBOL
compiler option DYNAM will also be required so that if the 24-bit assembler
program is called using CALL literal (like CALL 'MYASMIO'), then it will be
loaded at run time instead of linked in statically. I assume from your
original post that this must be your case, otherwise the programmers would not
be worrying about including the 24-bit program as part of the link step.
However, Option #2 does have the advantage of allowing the WORKING-STORAGE of
the COBOL programs to grow much larger in 31-bit storage without worrying about
using up all available 24-bit storage. If growth of internal tables or data in
the COBOL programs over time is a possible future maintenance headache for
using DATA(24), it might be better (though more work) to bite the bullet and
take option #2 now instead of later.
OTOH getting that 24-bit assembler I/O program correctly converted to 31-bit is
the better long-term option over all, and DATA(24) plus DYNAM gives you time to
do that as a priority. When that is done you can switch the COBOL compiles to
DATA(31) and you're done.
Good luck, and feel free to ask more questions if you need to.
HTH
Peter
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@bama.ua.edu] On
Behalf Of Barkow, Eileen
Sent: Wednesday, July 13, 2011 4:06 PM
To: IBM-MAIN@bama.ua.edu
Subject: Re: running Assembler I/O macro code as AMODE 31, RMODE ANY
Thank you Peter.
I missed your post yesterday morning as well as some others.
I am beginning to think that there was delay in the email yesterday
morning and the msgs were delivered later in the
Day so I did not notice the earlier ones.
Option #1 sounds simpler than 2 since it does not require any code
changes.
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