Hi all, I was pretty sure that the STORAGE macros are "better" than GETMAIN/FREEMAIN, both in terms of functionality and performance. To back that up, I searched for documentation.
What I found so far is a fairly recent presentation from SHARE: http://ew.share.org/client_files/callpapers/attach/SHARE_in_Denver/S1237DB120530.pdf which says (on page 34) that GETMAIN/FREEMAIN is taking a lot less cycles than STORAGE OBTAIN/RELEASE (17,000 vs. 20,000). I haven't found any IBM document saying anything about performance, all I got was that STORAGE is recommended for some environments (e.g. for AR mode). And then I found a thread on IBM-MAIN where Peter Relson talked about the relationship between the two: http://www.mail-archive.com/[email protected]/msg122945.html but unfortunately not much about the default LINKAGE=SYSTEM of STORAGE. I always thought that an SVC interrupt (GETMAIN) "costs" more than a PC (STORAGE with LINKAGE=SYSTEM) - am I wrong? Anyway: In a "normal" environment (primary mode, key 8), what would you recommend to use and why? And if you want to "modernize" a module, would you change from one to the other? Thanks for your input, Beate
