On Sun, 23 Jul 2017, dave wrote:
Date: Sun, 23 Jul 2017 10:37:09 -0700
From: dave <dengv...@charter.net>
Reply-To: "Enhanced Machine Controller (EMC)"
<emc-users@lists.sourceforge.net>
To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
Subject: Re: [Emc-users] latency excursions
On 07/23/2017 10:14 AM, Peter C. Wallace wrote:
On Sun, 23 Jul 2017, dave wrote:
Date: Sun, 23 Jul 2017 08:48:19 -0700
From: dave <dengv...@charter.net>
Reply-To: "Enhanced Machine Controller (EMC)"
<emc-users@lists.sourceforge.net>
To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
Subject: [Emc-users] latency excursions
dave@linuxcnc:~$ uname -a
Linux linuxcnc 3.4-9-rtai-686-pae #1 SMP PREEMPT Debian 3.4.55-4linuxcnc
i686 i686 i386 GNU/Linux
task: 103857488 cycles, min=0.000049, max=0.474214, avg=0.010993, 86
latency excursions (> 10x expected cycle time of 0.010000s)
task: 25439189 cycles, min=0.000049, max=0.205898, avg=0.010989, 17
latency excursions (> 10x expected cycle time of 0.010000s)
I've done nothing to tune this cpu and as far as I can tell the motion is
ok.
Still it leave me uncomfortable.
What do I need to change to clean this uo?
TIA
Dave
These are not real-time latency issues but rather delays in task
so are not a actual problem unless they are so long that they cause
a disruption the the non-real time tasks linuxCNC is doing (user interface
etc)
These delays will not be reduced by any real time latency tuning of the
system ( and may well be made worse by things that slow the userland
performance like isocpus )
Peter Wallace
Mesa Electronics
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(='.'=) This is Bunny. Copy and paste bunny into your
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Thanks Peter,
I suppose I should have picked up on the 'task'. I'm going to use age as an
excuse. ;-)
I re-tuned the x axis yesterday for some improvement; following error is
somewhere around 2E-5.
Dave
You can do a little experiment with delaying task by starting LinuxCNC from
the command line and then suspending it while running gcode with control Z.
This does not disrupt motion in progress, as long as the delay is not too
long, and if it is too long you will get:
USRMOT: ERROR: command timeout
(after the control Z, you can resume task/user-interface with "fg 1")
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Peter Wallace
Mesa Electronics
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(")_(") signature to help him gain world domination.
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