RE: z/OS 64-bit Java - My preference is to run the 31-bit JVM on z/OS unless you really need 64-bit (eg. you need more than 1.5G java heap). Although SDK6-64 has come a long way in eliminating the performance penalty, it is still heavier than 31-bit. Also, consider that many z/OS services are not 64-bit enabled yet, so with a 64-bit JVM you end up moving stuff below the line when doing many OS service calls. Of course, this is a moving target; it could be that 64-bit Java is just as fast for some workloads if you tune it just right.
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