On Friday 22 June 2018 08:47:05 andy pugh wrote:
> I haven't seen this mentioned here. It seems that it might be
> relevant:
>
> https://www.raspberrypi.org/forums/viewtopic.php?t=206747
I almost missed this, bookmarked now, thanks Andy.
This thread got into a serious list of questions about ho
On Friday 22 June 2018 21:42:53 Jon Elson wrote:
> On 06/22/2018 11:10 AM, Peter C. Wallace wrote:
> > Linux has had real time kernels for more than 10 years
>
> rt-linux was used by the original EMC (1) in about 1996 to
> port the original EMC over from Sun hardware.
> So, it has been about 22 ye
John,
Keeping the discussion theoretical, There are basically three ways to
implement an RT Linux, one is as you said you change to the scheduler
algorithm to give processes with "RT" priority the CPU when they need it.
But this a only a kind of "soft RT system that works if your RT
requirements a
I'm pretty sure the Unix running on the PDP-10 that I used for a University
graphics course was also running a real time scheduler. And that was back
in 1982.
What an RTOS does is provide a fair method of giving users equal time to the
scarce resources. It does that at the cost of itself taking
On 06/22/2018 11:10 AM, Peter C. Wallace wrote:
Linux has had real time kernels for more than 10 years
rt-linux was used by the original EMC (1) in about 1996 to
port the original EMC over from Sun hardware.
So, it has been about 22 years! Amazing! I got my first
EMC system running in 1997
On 22 June 2018 at 18:52, Chris Albertson wrote:
> With five different RT solutions Linux is good at RT.
>
> From a Linux CNC user's perspective it might seem that the choices are more
> limited.
Yes, LinuxCNC only works with three of the five.
--
atp
"A motorcycle is a bicycle with a pandemo
There are at least five different kinds of real time Linux.I about 20
years ago I write firmware for a CCD camera that run on real-time linux.
Real-Time Lins was not new then.
But there is a problem with all RT systems. You get low latency an
predictable timing but at the cost of efficiency.
FYI, if you use Stamps.com the shipping rates are pretty much identical
to Ebay and if you create a shipping label online with USPS, those rates
are very close to the Ebay rates as well. All of these rates are
cheaper than if you ship by visiting a USPS office/Post Office.
So if you want ch
On Friday 22 June 2018 11:39:55 John Dammeyer wrote:
> I believe the BeagleBone Black MachineKit uses one of the RT kernel
> modifications. However, it's the two PRU processors inside the Beagle
> that make it possible to run stepping motors and decode encoders.
>
> It actually boggles my mind th
On Fri, 22 Jun 2018, John Dammeyer wrote:
Date: Fri, 22 Jun 2018 08:39:55 -0700
From: John Dammeyer
Reply-To: "Enhanced Machine Controller (EMC)"
To: "'Enhanced Machine Controller (EMC)'"
Subject: Re: [Emc-users] Raspberry Pi PREEMPT-RT
I believe the BeagleBone Black MachineKit uses one
I believe the BeagleBone Black MachineKit uses one of the RT kernel
modifications. However, it's the two PRU processors inside the Beagle that
make it possible to run stepping motors and decode encoders.
It actually boggles my mind that decades after say OS-968K, VRTX-86 RTOS or for
that matte
I haven't seen this mentioned here. It seems that it might be relevant:
https://www.raspberrypi.org/forums/viewtopic.php?t=206747
--
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch,
On 22 June 2018 at 00:51, andy pugh wrote:
> -- Forwarded message --
> From: dave engvall
> What I'm trying to do is hang a request (OT) on the list looking for
> cheap and not so fast ways of getting alloy steel across the pond
I think that an alternative question that would ac
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