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Manshadi
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Joined: 31 Aug 2005
Posts: 82
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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 |
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Bill Woodger
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Joined: 09 Mar 2011
Posts: 7309
Location: Inside the Matrix
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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? |
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Manshadi
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Joined: 31 Aug 2005
Posts: 82
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| Nothing, I just try if it's possible to use 64-bit addressable real memory capability to find better performance. |
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Robert Sample
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Joined: 06 Jun 2008
Posts: 8697
Location: Dubuque, Iowa, USA
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| 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). |
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