Morning, John. Yes, for the most part, running in 64-bit mode will not be quite as efficient as running the same application in 31 bit mode. CP has more memory to keep track of, and that means larger page tables, TLBs etc. If the guest is Linux, then Linux also has more work to do in it's virtual storage management code as well, keeping track of the extra memory.
I would advise that you try to run your application is the smallest 31 bit virtual machine that you can. McKown, John wrote:
Assuming that I have a workload which will run effectively in 31 bit mode, does anybody know if it will run more efficiently in 31 bit mode than in 64 bit mode. That is, does 64 bit mode on System z have more overhead (either hardware or software) than 31 bit mode? Or is this another "it depends" question? -- John McKown Senior Systems Programmer HealthMarkets Keeping the Promise of Affordable Coverage Administrative Services Group Information Technology This message (including any attachments) contains confidential information intended for a specific individual and purpose, and its content is protected by law. If you are not the intended recipient, you should delete this message and are hereby notified that any disclosure, copying, or distribution of this transmission, or taking any action based on it, is strictly prohibited. ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
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