* [pups] thrust meter?
@ 2006-10-05 4:17 Brian Knittel
2006-10-05 12:15 ` Dave Horsfall
0 siblings, 1 reply; 7+ messages in thread
From: Brian Knittel @ 2006-10-05 4:17 UTC (permalink / raw)
The thrust meter project -- was that an analog meter that displayed %
CPU utilization? I remember that Tom Ferrin had one mounted in the
middle of a DEC panel filler on the 11/70 at the Computer Graphics
Lab at UCSF. It was really delightful having this analog meter
bouncing up and down as people worked away.
Brian
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
_| _| _| Brian Knittel
_| _| _| Quarterbyte Systems, Inc.
_| _| _| Tel: 1-510-559-7930
_| _| _| Fax: 1-510-525-6889
_| _| _| Email: brian at quarterbyte.com
_| _| _| http://www.quarterbyte.com
^ permalink raw reply [flat|nested] 7+ messages in thread
* [pups] thrust meter?
2006-10-05 4:17 [pups] thrust meter? Brian Knittel
@ 2006-10-05 12:15 ` Dave Horsfall
2006-10-09 23:02 ` John Holden
0 siblings, 1 reply; 7+ messages in thread
From: Dave Horsfall @ 2006-10-05 12:15 UTC (permalink / raw)
On Wed, 4 Oct 2006, Brian Knittel wrote:
> The thrust meter project -- was that an analog meter that displayed %
> CPU utilization? I remember that Tom Ferrin had one mounted in the
> middle of a DEC panel filler on the 11/70 at the Computer Graphics Lab
> at UCSF. It was really delightful having this analog meter bouncing up
> and down as people worked away.
I believe so...
(Dave leans over to dig out article.)
OK, page 27 of AUUG Vol 2 No 5 (Jun/Jul 1980).
It integrated the BUS BUSY signal over a suitable time constant (and my
electronics knowledge is a bit too rusty to figure out Tc, but with a
10uF tantalum capacitor I imagine it would be a few seconds).
The credits are:
Designed originally by Pete Madams (Essex), modified by J Feenstra
(Nijmegen), and this drawing executed by Paul Griffith (Essex).
-- Dave
^ permalink raw reply [flat|nested] 7+ messages in thread
* [pups] thrust meter?
2006-10-05 12:15 ` Dave Horsfall
@ 2006-10-09 23:02 ` John Holden
2006-10-10 9:05 ` Johnny Billquist
2006-10-10 10:55 ` Dave Horsfall
0 siblings, 2 replies; 7+ messages in thread
From: John Holden @ 2006-10-09 23:02 UTC (permalink / raw)
On 05/10/2006, at 10:15 PM, Dave Horsfall wrote:
> On Wed, 4 Oct 2006, Brian Knittel wrote:
>
>> The thrust meter project -- was that an analog meter that displayed %
>> CPU utilization? I remember that Tom Ferrin had one mounted in the
>> middle of a DEC panel filler on the 11/70 at the Computer Graphics
>> Lab
>> at UCSF. It was really delightful having this analog meter
>> bouncing up
>> and down as people worked away.
>
> It integrated the BUS BUSY signal over a suitable time constant
> (and my
> electronics knowledge is a bit too rusty to figure out Tc, but with a
> 10uF tantalum capacitor I imagine it would be a few seconds).
Um, depends what you mean by thrust. It was originally designed for a
11/45
where bus activity would have been a fare indication of machine load
since
all memory and i/o used the unibus (I'm excluding the effects of fastbus
memory on 11/50 and 55's).
The 11/70 unibus was actually slower than the 11/45, and generally
didn't
have memory or disk/tape i/o on it (separate memory bus and massbus). So
'thrust' was probably mainly character i/o (dh and dz's) and older
disk/tapes (RK05's etc)
Now, where's 11/70 maintenance printset?
Cheers
John
^ permalink raw reply [flat|nested] 7+ messages in thread
* [pups] thrust meter?
2006-10-09 23:02 ` John Holden
@ 2006-10-10 9:05 ` Johnny Billquist
2006-10-10 11:00 ` Dave Horsfall
2006-10-10 10:55 ` Dave Horsfall
1 sibling, 1 reply; 7+ messages in thread
From: Johnny Billquist @ 2006-10-10 9:05 UTC (permalink / raw)
John Holden wrote:
> On 05/10/2006, at 10:15 PM, Dave Horsfall wrote:
>
>>On Wed, 4 Oct 2006, Brian Knittel wrote:
>>
>>>The thrust meter project -- was that an analog meter that displayed %
>>>CPU utilization? I remember that Tom Ferrin had one mounted in the
>>>middle of a DEC panel filler on the 11/70 at the Computer Graphics
>>>Lab
>>>at UCSF. It was really delightful having this analog meter
>>>bouncing up
>>>and down as people worked away.
>>
>>It integrated the BUS BUSY signal over a suitable time constant
>>(and my
>>electronics knowledge is a bit too rusty to figure out Tc, but with a
>>10uF tantalum capacitor I imagine it would be a few seconds).
>
> Um, depends what you mean by thrust. It was originally designed for a
> 11/45
> where bus activity would have been a fare indication of machine load
> since
> all memory and i/o used the unibus (I'm excluding the effects of fastbus
> memory on 11/50 and 55's).
>
> The 11/70 unibus was actually slower than the 11/45, and generally
> didn't
> have memory or disk/tape i/o on it (separate memory bus and massbus). So
> 'thrust' was probably mainly character i/o (dh and dz's) and older
> disk/tapes (RK05's etc)
>
> Now, where's 11/70 maintenance printset?
I got them here. :-)
Hmm, but yeah. Since the bus might be idle even though the CPU is
running, you might not get a very good reading by looking at the unibus.
But I think there are other signals that would be better to integrate
over. Such as the MASTER lamp (or is it the CPU lamp perhaps?) of the
front panel.
Johnny
^ permalink raw reply [flat|nested] 7+ messages in thread
* [pups] thrust meter?
2006-10-09 23:02 ` John Holden
2006-10-10 9:05 ` Johnny Billquist
@ 2006-10-10 10:55 ` Dave Horsfall
1 sibling, 0 replies; 7+ messages in thread
From: Dave Horsfall @ 2006-10-10 10:55 UTC (permalink / raw)
On Tue, 10 Oct 2006, John Holden wrote:
> Um, depends what you mean by thrust. It was originally designed for a
> 11/45 where bus activity would have been a fare indication of machine
> load since all memory and i/o used the unibus (I'm excluding the effects
> of fastbus memory on 11/50 and 55's).
According to the article, it was indeed for the 11/45.
-- Dave
^ permalink raw reply [flat|nested] 7+ messages in thread
* [pups] thrust meter?
2006-10-10 9:05 ` Johnny Billquist
@ 2006-10-10 11:00 ` Dave Horsfall
2006-10-10 22:20 ` John Holden
0 siblings, 1 reply; 7+ messages in thread
From: Dave Horsfall @ 2006-10-10 11:00 UTC (permalink / raw)
On Tue, 10 Oct 2006, Johnny Billquist wrote:
> Hmm, but yeah. Since the bus might be idle even though the CPU is
> running, you might not get a very good reading by looking at the unibus.
> But I think there are other signals that would be better to integrate
> over. Such as the MASTER lamp (or is it the CPU lamp perhaps?) of the
> front panel.
Which reminds me; try holding the light-pen of a GT40 against its own
console lights :-)
-- Dave
^ permalink raw reply [flat|nested] 7+ messages in thread
* [pups] thrust meter?
2006-10-10 11:00 ` Dave Horsfall
@ 2006-10-10 22:20 ` John Holden
0 siblings, 0 replies; 7+ messages in thread
From: John Holden @ 2006-10-10 22:20 UTC (permalink / raw)
On 10/10/2006, at 9:00 PM, Dave Horsfall wrote:
> On Tue, 10 Oct 2006, Johnny Billquist wrote:
>
>> Hmm, but yeah. Since the bus might be idle even though the CPU is
>> running, you might not get a very good reading by looking at the
>> unibus.
>> But I think there are other signals that would be better to integrate
>> over. Such as the MASTER lamp (or is it the CPU lamp perhaps?) of the
>> front panel.
>
The MASTER lamp signifies that the CPU has the unibus, hence a
similar problem
to using BUS BUSY. You could use KERNEL/SUPERVISOR/USER signals as an
indication
of context switches. My favourite is a light chaser using the data
display from
the idle loop. Only works on an 11/45/50/55/60/70 (a bit boring on a
11/60 as
it had a 7 segment display).
> Which reminds me; try holding the light-pen of a GT40 against its own
> console lights :-)
>
Got one in my office. The lightpen latches the current x/y
coordinates from
the d/a converters. Aim it at something that will trigger it and you
get random
hits all over the screen
^ permalink raw reply [flat|nested] 7+ messages in thread
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Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
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2006-10-05 4:17 [pups] thrust meter? Brian Knittel
2006-10-05 12:15 ` Dave Horsfall
2006-10-09 23:02 ` John Holden
2006-10-10 9:05 ` Johnny Billquist
2006-10-10 11:00 ` Dave Horsfall
2006-10-10 22:20 ` John Holden
2006-10-10 10:55 ` Dave Horsfall
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