A lot of installations run multiple CICS / IMS / DB2 regions because one or two 2GiB regions is not nearly enough. JAVA does offer an option to run from 2GiB to 8GiB using 4 bit pointers that are shifted 3 bits to a multiple of 8 bytes. Almost no one uses this because the shifting slow down every memory access, much cheaper to use more memory for 64 bit pointers.
On Thu, Apr 4, 2019 at 10:31 AM Paul Edwards <mutazi...@gmail.com> wrote: > > On Thu, 4 Apr 2019 14:42:47 +0300, Binyamin Dissen > <bdis...@dissensoftware.com> wrote: > > >Sounds like a pretty narrow range of applications, where the existing above > >the line is not enough, but an extra 2G will be enough forever. > > It's sometimes not a matter of "not enough" > so much as "capability". E.g. a 32-bit editor > is capable of editing either 2 GiB or 4 GiB > files, depending on whether it is compiled > AM31 or AM32. If you exceed the capability > you are forced to use your less-preferred > editor. I would like to give users the > maximum capability that 32 bits can give. > > >Why do you feel 64bit is "overkill"? > > Because it invalidates all old hardware. An > AM32 program can still run as AM31 on old > hardware, or even AM24 on very old > hardware. > > BFN. Paul. > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN -- Mike A Schwab, Springfield IL USA Where do Forest Rangers go to get away from it all? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
