Results of latency test, list of computers tested for use with LinuxCNC

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20 Feb 2022 00:51 - 20 Feb 2022 00:54 #235373 by rdeeming
To use use with linuxcnc master branch.

 diff --git a/scripts/latency-histogram b/scripts/latency-histogram
index ed2f5e031..db08d876d 100755
--- a/scripts/latency-histogram
+++ b/scripts/latency-histogram
@@ -705,7 +705,7 @@ proc update_bin_data {thd} {
set ::LH($thd,nextra) [hal getp $::LH($thd,name).nextra]
set ::LH($thd,n,more) [expr $nmore + $::LH($thd,nextra)]
if !$::LH(use_x) {
- puts [format "%5d s %6s min:%8.3f us max:%8.3f us sdev:%8.3f us" \
+ puts [format "%5d secs %6s min:%8.3f us max:%8.3f us sdev:%8.3f us" \
$::LH(elapsed) \
$thd \
$::LH($thd,latency_min,us) \
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Last edit: 20 Feb 2022 00:54 by rdeeming.
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20 Feb 2022 14:06 #235384 by seuchato

To use use with linuxcnc master branch.

 diff --git a/scripts/latency-histogram b/scripts/latency-histogram
index ed2f5e031..db08d876d 100755
--- a/scripts/latency-histogram
+++ b/scripts/latency-histogram
@@ -705,7 +705,7 @@ proc update_bin_data {thd} {
set ::LH($thd,nextra) [hal getp $::LH($thd,name).nextra]
set ::LH($thd,n,more) [expr $nmore + $::LH($thd,nextra)]
if !$::LH(use_x) {
- puts [format "%5d s %6s min:%8.3f us max:%8.3f us sdev:%8.3f us" \
+ puts [format "%5d secs %6s min:%8.3f us max:%8.3f us sdev:%8.3f us" \
$::LH(elapsed) \
$thd \
$::LH($thd,latency_min,us) \
 

rdeeming: thx a ton, was digging but could not fin this.
I am going to test this later today on an old 2.8.1 or 2 install which has not been updated for say 6 months and a fresh one which I am going to pull right now (2.8.2 with all upgrades/updates to date as of 220220). I am currently playing with 2.8.1 on Pi4.
greez
chris

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22 Feb 2022 23:19 #235565 by Bagels
Gigabyte Z370 chipset, H270M-D3H
Intel i3 Skylake 6100 (no isolcpus)
SATA SSD
8GB RAM DDR4 - 2x4 2133MT/s
GeForce GTX 1060

[img]undefined[/img][img]undefined[/img] imgur.com/V7J2Lif imgur.com/V7J2LifShould note that this mirrors a separate earlier test I did where I was loading it more heavily. Seems pretty consistent. 

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23 Feb 2022 10:52 #235588 by tommylight
Use :
latency-histogram --show
The screenshot shows excursions outside the visible area.
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23 Feb 2022 11:40 - 23 Feb 2022 11:42 #235593 by seuchato
Tommy
Agreed, but still Bagels' values are not too far off:
base -24.1/-20 to +23.2/+20
servo -54/-20 to +56/+20
=> values look promising/good to me
greez
chris
remark: It is not clear, how the machine was loaded
Last edit: 23 Feb 2022 11:42 by seuchato. Reason: typo, remark added
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01 Mar 2022 04:52 - 01 Mar 2022 04:56 #236079 by sou528
There are no results. What am I doing wrong?

Warning: Spoiler!
Last edit: 01 Mar 2022 04:56 by sou528.

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01 Mar 2022 13:51 #236112 by tommylight
>>>Unexpected realtime delay on task 0 with period 25000<<<
Do you need a base period, or, do you plan on using parallel port?
If not, do not test base period.

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03 Mar 2022 16:45 #236276 by sou528
tommylight Thank you for your reply.

I recently got this computer. I have used it with OPTIPLEX 760 with parallel port connection. However, I am worried about when it will not start, so I am thinking about replacing it with this OPTIPLEX 980.

But does this mean there is a fatal delay?
Should I forgo using it on a parallel port?

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03 Mar 2022 17:30 #236283 by tommylight
If it works, use it.
Not sure i had 980, so i have no clue about latency.

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08 Mar 2022 09:20 #236646 by seuchato

tommylight Thank you for your reply.

I recently got this computer. I have used it with OPTIPLEX 760 with parallel port connection. However, I am worried about when it will not start, so I am thinking about replacing it with this OPTIPLEX 980.

But does this mean there is a fatal delay?
Should I forgo using it on a parallel port?
 

If you lookup this thread, you will find some entries of my 980s. I am running one of these using parport just fine. See here for example. Kindly checkout my other posts for these dell 980s. There is some finetuning ahead, but I guess the results speak for themselves.
Greez
chris
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