blinkenlights

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blinkenlights

Eben King
Is there any sort of hardware device that shows (some of) the memory
accesses on a modern computer, reminiscent of such displays on old
mainframes?  Obviously it couldn't show all of them, it would be a blur.
It would either update at most once every X ms, or only show reads/writes of
at least Y bytes, or something like that.

--
-eben    [hidden email]    ebmanda.redirectme.net:81
LIBRA:  A big promotion is just around the corner for someone
much more talented than you.  Laughter is the very best medicine,
remember that when your appendix bursts next week.  -- Weird Al
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Re: blinkenlights

Pete Theisen
My Dell "studio" box has a little flashy light when there is hard drive
activity. Does that count?

Seems that the drive wouldn't move unless it was accessing memory but I
could have that wrong . . .

On 11/23/2015 01:15 AM, Eben King wrote:
> Is there any sort of hardware device that shows (some of) the memory
> accesses on a modern computer, reminiscent of such displays on old
> mainframes?  Obviously it couldn't show all of them, it would be a blur.
> It would either update at most once every X ms, or only show
> reads/writes of at least Y bytes, or something like that.
>

--
Regards,

Pete
https://www.facebook.com/pete.theisen.5
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Re: blinkenlights

Bryan Lee
In reply to this post by Eben King
Thus Eben King hast written on Mon, Nov 23, 2015 at 01:15:53AM -0500, and, according to prophecy, it shall come to pass that:
> Is there any sort of hardware device that shows (some of) the memory
> accesses on a modern computer, reminiscent of such displays on old
> mainframes?  Obviously it couldn't show all of them, it would be a
> blur. It would either update at most once every X ms, or only show
> reads/writes of at least Y bytes, or something like that.

Does the output of `vmstat`  Provide the kind of information you want?

procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa
 0  0 126624  62628 126576 375836    0    0     1     0    0    1  1  0 99  0
 0  0 126624  62628 126576 375840    0    0     0     8  125   65  0  0 99  1
 0  0 126624  62628 126600 375840    0    0     0    10   30   36  0  0 98  2
 0  0 126624  62504 126600 375840    0    0     0     0   29   19  0  0 100  0
 0  0 126624  62504 126608 375840    0    0     0     9   29   28  0  0 99  1


This, or another system performance monitor, could be parsed and fed to an
external USB-connected LCD.
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Re: blinkenlights

Eben King
In reply to this post by Pete Theisen
On Mon, 23 Nov 2015, Pete Theisen wrote:

> On 11/23/2015 01:15 AM, Eben King wrote:
>> Is there any sort of hardware device that shows (some of) the memory
>> accesses on a modern computer, reminiscent of such displays on old
>> mainframes?  Obviously it couldn't show all of them, it would be a blur.
>> It would either update at most once every X ms, or only show
>> reads/writes of at least Y bytes, or something like that.

> My Dell "studio" box has a little flashy light when there is hard drive
> activity. Does that count?
>
> Seems that the drive wouldn't move unless it was accessing memory but I could
> have that wrong . . .

Accessing swap.  But it also does stuff when you're reading a file unrelated
to swap.

Anyhow, pretty much any modern computer (even laptops) has such a light.

--
-eben    [hidden email]    ebmanda.redirectme.net:81
LIBRA:  A big promotion is just around the corner for someone
much more talented than you.  Laughter is the very best medicine,
remember that when your appendix bursts next week.  -- Weird Al
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Re: blinkenlights

Eben King
In reply to this post by Bryan Lee
On Mon, 23 Nov 2015, Bryan Lee wrote:

> Thus Eben King hast written on Mon, Nov 23, 2015 at 01:15:53AM -0500, and, according to prophecy, it shall come to pass that:
>> Is there any sort of hardware device that shows (some of) the memory
>> accesses on a modern computer, reminiscent of such displays on old
>> mainframes?  Obviously it couldn't show all of them, it would be a
>> blur. It would either update at most once every X ms, or only show
>> reads/writes of at least Y bytes, or something like that.
>
> Does the output of `vmstat`  Provide the kind of information you want?
>
> procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
> r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa
> 0  0 126624  62628 126576 375836    0    0     1     0    0    1  1  0 99  0
> 0  0 126624  62628 126576 375840    0    0     0     8  125   65  0  0 99  1
> 0  0 126624  62628 126600 375840    0    0     0    10   30   36  0  0 98  2
> 0  0 126624  62504 126600 375840    0    0     0     0   29   19  0  0 100  0
> 0  0 126624  62504 126608 375840    0    0     0     9   29   28  0  0 99  1
>
> This, or another system performance monitor, could be parsed and fed to an
> external USB-connected LCD.

It only provides the amount of memory used in various ways.  I'm looking for
a real-time display of (some of) the actual accesses.  Maybe the lack of
such displays is because there's no way to make that torrent of data
understandable.

--
-eben    [hidden email]    ebmanda.redirectme.net:81
LIBRA:  A big promotion is just around the corner for someone
much more talented than you.  Laughter is the very best medicine,
remember that when your appendix bursts next week.  -- Weird Al
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Re: blinkenlights

rsmoot
In reply to this post by Bryan Lee

---- Bryan Lee <[hidden email]> wrote:
> Thus Eben King hast written on Mon, Nov 23, 2015 at 01:15:53AM -0500, and, according to prophecy, it shall come to pass that:
> > Is there any sort of hardware device that shows (some of) the memory
> > accesses on a modern computer, reminiscent of such displays on old
> > mainframes?  Obviously it couldn't show all of them, it would be a
> > blur. It would either update at most once every X ms, or only show
> > reads/writes of at least Y bytes, or something like that

Back in the early 60's I was overall SYSTEM CONTROLLER for the Strategic Air Command Command and Controll
node at Barksdale AFB. My computer took up about a quarter of good sized building. Each bit for computation was
a transister(2N404) powered card. It was a 32 bit computer. Each bit of the shift register and the CPU were displayed
real time to the operators. Our memory situation was a little complex. We had RAM that was magnetic core nonvolitile.
Next speed was spinning magnetic drum. The war plans were on a rack of 36" hard disks. Then there were the 1/2" Mag
tape drives. At the test facility were I did some training, they had an Analex wide carriage  very fast printer.
when it printed for more than a few seconds, the paper stood up several feet. I believe that could have done what
you want.
Back then if the operator had a problem, I believe the operator could step thru one cycle at a time manually and see
every bit's status.
For a modern computer you need to something that records the memory activity and print it out


                                      Richard Smoot
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Re: blinkenlights

Art Eaton
Well, can you just rig a set of LED's to blink a report from systemD in
morse code?  Better use wheat lights for that authentic glow. They are
less difficult to replace than vacuum tubes.  :)

On 11/23/2015 7:09 PM, [hidden email] wrote:

> ---- Bryan Lee <[hidden email]> wrote:
>> Thus Eben King hast written on Mon, Nov 23, 2015 at 01:15:53AM -0500, and, according to prophecy, it shall come to pass that:
>>> Is there any sort of hardware device that shows (some of) the memory
>>> accesses on a modern computer, reminiscent of such displays on old
>>> mainframes?  Obviously it couldn't show all of them, it would be a
>>> blur. It would either update at most once every X ms, or only show
>>> reads/writes of at least Y bytes, or something like that
> Back in the early 60's I was overall SYSTEM CONTROLLER for the Strategic Air Command Command and Controll
> node at Barksdale AFB. My computer took up about a quarter of good sized building. Each bit for computation was
> a transister(2N404) powered card. It was a 32 bit computer. Each bit of the shift register and the CPU were displayed
> real time to the operators. Our memory situation was a little complex. We had RAM that was magnetic core nonvolitile.
> Next speed was spinning magnetic drum. The war plans were on a rack of 36" hard disks. Then there were the 1/2" Mag
> tape drives. At the test facility were I did some training, they had an Analex wide carriage  very fast printer.
> when it printed for more than a few seconds, the paper stood up several feet. I believe that could have done what
> you want.
> Back then if the operator had a problem, I believe the operator could step thru one cycle at a time manually and see
> every bit's status.
> For a modern computer you need to something that records the memory activity and print it out
>
>
>                                        Richard Smoot
> _______________________________________________
> slug mailing list
> [hidden email]
> https://www.suncoastlug.org/mailman/listinfo/slug
>
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