On 9/05/2014 10:17 PM, Martin Packer wrote:
I thought CICS switched to using standard Program Fetch 25 years ago. "Old" V3? Does knowing that change anything?
Yes, now that you mention it, I did hear some story decades ago that CICS was switching to "standard" OS program management...
CICS V2 used to use "normal" LOADs to load RMODE=ANY modules above the line while still employing heritage CICS-style program management for RMODE=24 modules.
My SWAG is that either they had not modified their code to handle above the line program management by that stage, AND/OR it was not deemed necessary to perform all the usual program compression stuff given the "huge" increase in the address space size.
Extrapolating the speculation, they got around to updating their code to handle above the line as well, perhaps driven by a desire to make more efficient use of their virtual storage working set. Perhaps this was complete by CICS/ESA (V3), perhaps later, but it did happen.
I'm not a CICS guy, but I did see the CDEs in CICS address spaces for RMODE=ANY COBOL application programs in 1989, and I don't any more.
Cheers, Greg ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
