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

rdeeming
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4 years 8 months ago #235373 by rdeeming

Replied by rdeeming on topic Results of latency test, list of computers tested for use with LinuxCNC

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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seuchato
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4 years 8 months ago #235384 by seuchato

Replied by seuchato on topic Results of latency test, list of computers tested for use with LinuxCNC

rdeeming wrote:
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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Bagels
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4 years 8 months ago #235565 by Bagels

Replied by Bagels on topic Results of latency test, list of computers tested for use with LinuxCNC

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/V7J2Lif Should note that this mirrors a separate earlier test I did where I was loading it more heavily. Seems pretty consistent.

Attachment not found

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tommylight
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4 years 8 months ago #235588 by tommylight

Replied by tommylight on topic Results of latency test, list of computers tested for use with LinuxCNC

Use :

Code:

latency-histogram --show

The screenshot shows excursions outside the visible area.

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seuchato
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4 years 8 months ago #235593 by seuchato

Replied by seuchato on topic Results of latency test, list of computers tested for use with LinuxCNC

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

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SanzuiWorks
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4 years 7 months ago #236079 by SanzuiWorks

Replied by SanzuiWorks on topic Results of latency test, list of computers tested for use with LinuxCNC

There are no results. What am I doing wrong?

Warning: Spoiler!

LinuxCNC pc tests, version 20200930, started 01.03.2022 03:14:28
********************************************************************************
General info:
Dell Inc., OptiPlex 980
Bios version A18, dated 02/27/2018
Chipset: Intel Corporation 5 Series/3400 Series
Harddisk is rotational
The amount of swap currently used is 0
================================================================================
CPU related data:
model name   : Intel(R) Core(TM) i5 CPU         650 @ 3.20GHz
cpu cores   : 2
stepping   : 5
cache size   : 4096 KB
================================================================================
RAM related data:
Maximum Capacity: 16 GB
Size: 2048 MB
Size: 2048 MB
Size: 2048 MB
Size: 2048 MB
================================================================================
GPU related data:
product: Core Processor Integrated Graphics Controller
configuration: driver=i915 latency=0
================================================================================
Parallel port related data:
number of parallel ports is 1
parport0: PC-style at 0x378 (0x778), irq 7 [PCSPP,TRISTATE,EPP]
================================================================================
Os and desktop related data:
PRETTY_NAME="Linux Mint 20.3"

Should the info below not match with your machine,
kindly post the output of pstree here, including a brief
desciption of your desktop environment, window manager and
display manager. Tia
forum.linuxcnc.org/18-computer/39370-scr...-of-computer-latency

Desktop environment : gnome
Windowmanager       : Xfwm4
Displaymanager      : lightdm
================================================================================
Kernel related data:
Kernel 4.9.0-13-rt-amd64
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash isolcpus=1"
Cpu idle driver: intel_idle
================================================================================
Kernel modules data:
Check if pcspkr is loaded: No, which is good!
Check if snd modules are loaded: No, which is good!
================================================================================
Keyboard & Mouse related data:
Number of mice: 2
Mouse 0 : Logitech USB Optical Mouse
Mouse 1 :
Mice attached to USB:
Logitech, Inc. M90/M100 Optical Mouse
Keyboards attached to USB:
================================================================================
LinuxCNC related data:
LinuxCNC version is: 2.9.0~pre0.3879.g9a26e69fe
================================================================================
Preparing for latency test:
Started glxgears No. 1, 2, 3, 4, 5
..........
Started firefox with ' vimeo.com/150574260 ', WID 77594668
================================================================================
Command for latency test is:
su linuxcnc -c "latency-histogram --bbinsize 1000 --base 25000 --sbinsize 1000 --nox 2>&1 | tee -a 1646072020.lat &"

Latency testing loop started 2022年 3月 1日火曜日 03:14:44 JST,
should end after 2022年 3月 1日火曜日 05:14:44 JST

Useless to proceed, read the relevant part in 1646072020.lat

>>>Unexpected realtime delay on task 0 with period 25000<<<

================================================================================
Swap useage: prerun: 0, running: 0

================================================================================
CPU core temperatures:
Core 0: Tmin: 40.0°C, Tmax: 52.0°C, (high = +89.0°C, crit = +105.0°C)
Core 2: Tmin: 37.0°C, Tmax: 52.0°C, (high = +89.0°C, crit = +105.0°C)
================================================================================
last latency data is as follows:.

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tommylight
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4 years 7 months ago #236112 by tommylight

Replied by tommylight on topic Results of latency test, list of computers tested for use with LinuxCNC

Code:

>>>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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SanzuiWorks
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4 years 7 months ago #236276 by SanzuiWorks

Replied by SanzuiWorks on topic Results of latency test, list of computers tested for use with LinuxCNC

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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tommylight
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4 years 7 months ago #236283 by tommylight

Replied by tommylight on topic Results of latency test, list of computers tested for use with LinuxCNC

If it works, use it.
Not sure i had 980, so i have no clue about latency.

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seuchato
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4 years 7 months ago #236646 by seuchato

Replied by seuchato on topic Results of latency test, list of computers tested for use with LinuxCNC

SanzuiWorks wrote:
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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