Marty, It didn't make it into the margins of "amdahl presents VM/ESA PERFORMANCE WORKSHOP", copyright 1992, Amdahl Corporation, In its original binder, I might add, that I have here. The copy I have at home (everybody keeps a complete set of manuals at both data centers, no?) has more notes. I'll check. I wasn't in the class, lots of XAMAP examples, so maybe you taught one or the other and...
On 11/8/07, Marty Zimelis <[EMAIL PROTECTED]> wrote: > > Phil, > Unless there was something else out there (a poster or whatever), that > would have been me doing a riff in my VM Performance classes, first for > Amdahl, then for Velocity. Your buddy's time frame is about right (15 > years > ago). I was attempting to emphasize the impact of an RPS miss (show of > hands: who remembers what that was?) on response time. > > The riff started by me "complaining" that I didn't have a good intuitive > grasp of how fast CPUs were (tens of nanosecond cycle times at that > point), > so "let's slow down our timeframe and say a CPU cycle is one second. Then > a > page fault from Xstore is satisfied in [nn minutes], a DASD I/O satisfied > from cache takes [mm hours] and one that has to go to the real disk takes > [kk days]. An RPS miss adds [I think it was 16 hours] to that." > > Alas, a quick search of my notes didn't turn up a copy of the > discussion, > so I can't fill in the blanks. Perhaps someone who took one of the > classes > and wrote it down.... > > Marty > ____________________ > Martin Zimelis > Principal > maz/Consultancy > > > > > -----Original Message----- > > From: The IBM z/VM Operating System > > [mailto:[EMAIL PROTECTED] On Behalf Of Phil Smith III > > Sent: Thursday, November 08, 2007 1:48 PM > > To: [email protected] > > Subject: Poster of computer hardware events? > > > > A buddy asked me: > > > > "At a previous employer, someone had an article, poster or > > something (I know - real specific - it was 15+ years ago) > > that tried to put the time for computer events into > > perspective. It started with the quickest instruction (RR) > > having a baseline of 1 second. It the proceeded to go through > > all of the instructions, RX, RS, SS etc. and then into I/O, > > MIH and so on. Have you ever heard or seen anything like > > this? I'm having trouble stressing the importance of poor I/O > > response time and I thought this might be of use." > > > > I had to tell him I hadn't ever seen such a thing, but would > > like to. I figure if anyone else alive knows what this > > is/was, they'll be on one of these two lists...! > > > > Anyone? > > -- > > ...phsiii > > > > Phil Smith III > > Velocity Software > > www.velocity-software.com > > (703) 476-4511 (home office) > > (703) 568-6662 (cell) > > > -- Gregg Reed "No Plan, survives execution"
