Peter,

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I suspect that EPCS:VM produces a much bigger performance gain than AP or MP. ?ECPS:VM is the start of what eventually became SIE and microcode virtualization.

So VM (aka CP) is a software hypervisor. So when EPCS:VM is inactive CP has to simulate or reflect every privileged instruction that a VM executes.

ECPS:VM allows the CPU Microcode or in our case Hercules to handle some of these instructions.

I would try turning it on which may be fun…

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Change the line in the config

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ECPSVM NO

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To

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ECPSVM YES

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And use ECPSVM STATUS to see whats happening

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The only VM that does anything is CPWATCH. You should be using this to see what performance is like…

… on an idle system I see it shows real core 16,384, free 14,780. If you run one GCC compile it isn’t going to page very much.

.. and remember that you might have 16Mb available, but most programs don’t use it. I think GCC is the exception.

… if you don’t use the memory it won’t page.

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Dave

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