[Info-vax] VAX 6000 on Young Sheldon

[kemain.nospam at gmail.com]

> -----Original Message-----
> From: Info-vax <info-vax-bounces at rbnsn.com> On Behalf Of Dave Froble
> via Info-vax
> Sent: February 7, 2023 6:23 PM
> To: info-vax at rbnsn.com
> Cc: Dave Froble <davef at tsoft-inc.com>
> Subject: Re: [Info-vax] VAX 6000 on Young Sheldon
> 
> On 2/7/2023 4:17 PM, Arne Vajhøj wrote:
> > On 2/7/2023 10:04 AM, Johnny Billquist wrote:
> >> On 2023-02-07 01:52, Arne Vajhøj wrote:
> >>> On 2/6/2023 8:04 AM, Neil Rieck wrote:
> >>>> VAX-6000 was the first time I encountered SMP (symmetric multi
> >>>> processing) on VAX. We were running a 6430 which meant 3 CPUs
> >>>>
> >>>> Before that I worked for a year on a pair of VAX-8550 configured as
> >>>> a VAXcluster
> >>>>
> >>>> Our VAX-6430 system felt faster than the pair of clustered VAX-8550
> >>>
> >>> Based on VUPS ratings then I would expect:
> >>> - multi job throughput to be the same
> >>> - single job execution slower
> >>> - interactive responsiveness better
> >>
> >> Uh? The 64x0 single CPU VUPS rating is 7.0, while the 8550 is rated
> >> at 6.0 VUPS, so I would expect the 6430 to be faster for individual
> >> jobs, as well as
> >> *way* better at handling load, since you actually have three CPUs
> >> compared to just one on the 8550. Clustering two 8550 would not get
> close to a 3 cpu 64x0.
> >
> > Ooops.
> >
> > You are correct.
> >
> > I looked at the 63x0 instead of the 64x0 number.
> >
> > The 6430 is faster in every way than 2 x 8550.
> >
> > Mea culpa.
> 
> Reasonable.
> 
> I recall that the 8500s, 8600s, and such were still multiple board CPUs.  Then
> came the C-VAX and N-VAX micro-processors.  The micro-processors were
> much better, faster, and the later N-VAX CPUs were rather good, for a VAX.
> 
> My memory (yeah, right) is that the N-VAX was a RISC processor that
> emulated the VAX instruction set.  Or something like that.
> 

From: Digital Computing Timeline: Select VAX timeline
<http://gordonbell.azurewebsites.net/digital/timeline/32-bit.htm>

November 1991:
The NVAX chip, DIGITAL's fourth VAX microprocessor, is implemented in 0.75-micrometer CMOS technology and ships in the VAX 6600.


Regards,

Kerry Main
Kerry dot main at starkgaming dot com






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