Portal | Manuals | References | Downloads | Info | Programs | JCLs | Mainframe wiki | Quick Ref
IBM Mainframe Forum Index
 
Register
 
IBM Mainframe Forum Index Mainframe: Search IBM Mainframe Forum: FAQ Memberlist Profile Log in to check your private messages Log in
 
Compile COBOL in Mode 64 Bit

 
Post new topic   Reply to topic    IBMMAINFRAMES.com Support Forums -> COBOL Programming
View previous topic :: :: View next topic  
Author Message
Manshadi

New User


Joined: 31 Aug 2005
Posts: 82

PostPosted: Sat Jan 10, 2015 1:28 pm    Post subject: Compile COBOL in Mode 64 Bit
Reply with quote

Could somebody lead me to how we can change the COBOL compiler JCL to compile COBOL programs in 64 Bit?

Some information :
- Hardware Z9
- z/OS Version 1.12
- DB2 10
- CICS 4.1
- Cobol Version 4.2

Regards
Manshadi
Back to top
View user's profile Send private message

Bill Woodger

DFSORT Moderator


Joined: 09 Mar 2011
Posts: 7312

PostPosted: Sat Jan 10, 2015 1:43 pm    Post subject: Reply to: Compile COBOL in Mode 64 Bit
Reply with quote

No. No-one can. Enterprise COBOL, even up to V5.1.1, only supports 24- and 31-bit addressing.

Why? What do you have that is so vast?
Back to top
View user's profile Send private message
Manshadi

New User


Joined: 31 Aug 2005
Posts: 82

PostPosted: Sat Jan 10, 2015 1:50 pm    Post subject: Reply to: Compile COBOL in Mode 64 Bit
Reply with quote

Nothing, I just try if it's possible to use 64-bit addressable real memory capability to find better performance.
Back to top
View user's profile Send private message
Robert Sample

Global Moderator


Joined: 06 Jun 2008
Posts: 8501
Location: Dubuque, Iowa, USA

PostPosted: Sat Jan 10, 2015 9:33 pm    Post subject:
Reply with quote

Quote:
I just try if it's possible to use 64-bit addressable real memory capability to find better performance.
First, unless you have a KNOWN performance issue (such as batch jobs not completing in the batch window), it is rarely a good use of resources to attempt to improve performance. I haven't a Z9 to test with, but I suspect COBOL is probably close to 100 million lines of code executed per second of CPU time -- so performance concerns need to be reviewed with this in mind.

Second, merely changing from 31-bit to 64-bit addressing will NOT have any impact on performance -- if program performance is a dog with 31 bit addresses, it won't suddenly starting running faster just because you increased the available memory.

Third, programs can be CPU-bound or IO-bound (meaning the program is waiting for CPU or IO). An IO-bound program will not be helped by anything CPU-related (including memory) unless the issue is a lack of buffers in which case adding buffers will improve performance (but adding buffers will not require 64-bit addressing, either).
Back to top
View user's profile Send private message
View previous topic :: :: View next topic  
Post new topic   Reply to topic    IBMMAINFRAMES.com Support Forums -> COBOL Programming All times are GMT + 6 Hours
Page 1 of 1

 

Search our Forum:

Similar Topics
Topic Author Forum Replies Posted
No new posts COBOL -DB2 SQL code to have GROUP BY ... vinu78 DB2 21 Wed Oct 23, 2019 7:00 pm
No new posts How to handle NULL in COBOL program bhaskar_kanteti COBOL Programming 8 Mon Oct 07, 2019 3:54 pm
This topic is locked: you cannot edit posts or make replies. COBOL/CICS with real time MQ Series u... BPranav CICS 2 Mon Sep 16, 2019 9:19 pm
This topic is locked: you cannot edit posts or make replies. Compare two files logic in COBOL Nishant Singhal COBOL Programming 4 Sun Aug 25, 2019 2:25 am
This topic is locked: you cannot edit posts or make replies. Upgrade to Enterprise COBOL 6 JPVRoff COBOL Programming 4 Thu Aug 01, 2019 7:21 am

Facebook
Back to Top
 
Job Vacancies | Forum Rules | Bookmarks | Subscriptions | FAQ | Polls | Contact Us