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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?

2305 was nice because of no seek time. In an Hercules emulated environment, probably doesn't make a difference. I was on the periphery of a 360/75 MVT -> 4341 MVT under VM transition (I got to do some

Share file, didn’t want to undo existing stuff Dave Sent: 29 January 2020 22:33 To: [email protected] Subject: Re: [h390-vm] CP Query

Indeed, and I was just wondering how to report CMSLIB version, and of course GCC brexx etc all have versions. As for the distribution ... why not just have a version in a file on a shared drive and

General Hercules discussions should be on the hercules-390 group… <https://hercules-390.groups.io/g/group/topics> https://hercules-390.groups.io/g/group/topics the history of how the forks occurred

Spinhawk is also the version which Linux