Update to RPi4 linuxcnc built on buster-lite, choked to 3Gig memory.
4 times now I have run a loop of 3Dchips ( o-word loop of 100 iterations )
Each time, after the program ended,
I got UnexpectedRealTimeDelay
Not immediately but within a few minutes of sitting idle.
Nothing else is running.
The last time I watched it, there was no UXRTdelay for about 5 minutes
and it seemed different.
Then a dialog showing progress of some upgrade
( I never granted auto-upgrades )
then a reboot occured
and when I signed in,
I notice a small noise from the HDMI tv monitor
Something had turned on speech-dispatcher
I killed all the espeak amd speechd and orca processes ( sudo killall blah )
Then used synaptic to find all related packages and removed them.
I tried to find why any autoupgrade occurred but see nothing in
/var/log/syslog that suggests what was just installed
( the progress bar for the upgrade ran for about 2 minutes , so it had
time enuf )
I have NO idea why this happened,
I'm not looking for conspiracy theories, but I'm putting up a small flag
noting this occurred.
Also I am pulling back on the 'PI4 is a useful stepper platform',
I'm agin it for now,
and retreating to my Pi3B on OPipluse2e's
TomP
Sorry Matt for posting to you instead of list
-------- Forwarded Message --------
Subject: Re: [Emc-developers] Withdraw Pi support?
Date: Tue, 19 Jan 2021 21:37:00 +0700
From: Thomas J Powderly <[email protected]>
To: Matt Shaver <[email protected]>
I just built (19jan2021) on an RPi4 4G
beginning with a raspian server
http://ftp.jaist.ac.jp/pub/raspberrypi/raspbian_lite/images/raspbian_lite-2020-02-14/2020-02-13-raspbian-buster-lite.zip
<http://ftp.jaist.ac.jp/pub/raspberrypi/raspbian_lite/images/raspbian_lite-2020-02-14/2020-02-13-raspbian-buster-lite.zip>
adding RPD desktop(lxde)
https://www.raspberrypi.org/forums/viewtopic.php?t=133691
the adding the debs according to
http://linuxcnc.org/docs/2.8/html/getting-started/getting-linuxcnc.html#_installing_on_raspbian_10
and it ran latency histogram --base 75000 --servo 1000000 with 4
glxgears for 3 hrs 20 min
base -40 +37 servo -50 +50
I edited for isocpus=1,2,3 idle=poll, and total_mem=3072 (for usb),
and made no changes to video
Then I changed the testing to: running Linuxcnc, looking for UXRTdelays,
using a looped 3Dchips ( runs 100 times, printing out a debug count each
pass )
runs well so far , Ill let it cook overnight.
I ran all the updates and upgrades in those instructions,
and I'd guess that'd obliterate the initial setup.
so I dont know why this works better
I'm just saying the Pi4 will work ok for stepper systems with largish
steps (.0005" or my .0075mm)
( I get 6666.66666 steps per second and dont have reset pins, so no
doublestep )
I belive the Pi team will fix the usb memory size issue
Its neccesary for them to fix, or eat a lot of merchandise.
thx
TomP
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