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I run MVS as a guest of VM.? In fact that is the only way I run it.? It runs great, and I am not sure why there is so much misinformation about the 'negative aspects' of running this way.? To be

My experience was that MUSIC performed really well under VM provided it had enough memory and even better still if it was locked in storage. It was possible to support over a hundred users on MUSIC

Steven, I think it was Joe who mentioned the assists. To be honest while I think for CMS, VM is the “bees knees”, when you try to run MVS in a VM the wheels can fall off the car because of the

Probably overthinking! It sounds like at best we are talking about marginal differences. Anyway I have my Dockerfile working so I will try some speed tests with different configs over the weekend.

Was Adrian thinking that a page fault* would be the cause of the I/O? Presumably if one accesses an address from within CMS that is not, at that moment, mapped to real memory it is CP, not CMS, that

Joe, Not really much to do with IO. Hercules implements these as was mentioned earlier. Shadow Table Bypass is only relevant when running a guest OS that use virtual memory. CMS only runs with DAT off

Adrian For CMS its pretty much the same!. That’s the who benefit of channels. You send the SIOs to the channel and the channel and controllers work out what to do. Dave Sent: 30 January 2020 15:38

Back when I was in college, the administrative center was run on a 4341, and a 4331 was what supported all the campus’ student computing needs. I worked in the lab as an RJE operator. I think back

So according to this guide there were VMASSISTS in ECPS:VM ... http://www.bitsavers.org/pdf/ibm/370/VM_370/GA22-7074-0_Virtual-Machine_Assist_and_Shadow-Table-Bypass_Assist_May80.pdf Joe

Cool - and in terms of CP (or VM/370) code is there much difference? A

Joe, Interesting! Contrast that with the top of page 65:- GENERAL OPERATION OF THE CHANNELS The channels in the 4341 Processor are microcode and hardware controlled. They are integrated channels and,

"I guess, in the context of hercules, we are looking for the device which required the fewest S/370 CPU cycles so that most of the work is done in x86-64 land, but also one where the engineers didn't

I guess, in the context of hercules, we are looking for the device which required the fewest S/370 CPU cycles so that most of the work is done in?x86-64 land, but also one where the engineers didn't

Dave, The 2305 uses a block multiplexor channel ... "The 2835 storage Control and 2305 Fixed Head Storage Module form a large capacity, high -speed direct access storage facility for general purpose

Dave, Huh? To quote the manual: "The 4341 Processor generates less total interference with instruction execution than intermediate-scale System/360 and System/370 processors because the amount of time

Doug, On the low end 43xx boxes in effect the channel is implemented using some of the main CPU so device that generate high IO can degrade CPU performance…

Have both.

SSDs don't HAVE seek time, and for that matter modern I/O speed (even USB 2) versus 1970s parallel channel performance is no contest.?? But no one told VM all that, so it may still have the bias to

I would ask why shouldn't X Y and Z report their own level, and not have to fold that into CP?