> I have a few lpars with 192MB of real defined. Would that be enough for > 64-bit testing ? The discussiong seemed to get off track about real storage. You can start testing 64 bit virtual with any amount of real storage. It is virtual storage and only what you use, requires backing in real or aux. Start out with simple C programs that you can compile for 64 bit. They will use a little more virtual than the 31 bit version, but simply compiling for 64 bit will not cause them to require significantly more real storage to run. What you don't want to do is create a testcase which allocates 20 gig of 64 bit virtual and then attempts to back all of the pages by touching them. For that to work, you would need at least 20 gig of real plus paging space. Within IBM, we have run tests with a 64 bit JVM and an 8 gig java heap. It works fine, but some testers thought that if one was good, why not start 10 of them. To do that, you simply need more real. Most customers don't run with too much paging. That remains true with 64 bit virtual as well. The capability is there to write a program that allocates 16 exabytes of virtual. Unfortunately, with a max of 128 gig of real, that would leave you with the requirement to attach a zillion page packs to the system. Performance would probably not be too good. Don Ault, 8-295-1750, 845-435-1750
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