Monitor Latency while running linuxcnc?

Hi all!

As I allready mentioned in my other thread, I am getting totally different latency values in latency-test and latency-plot.

Is it possible to run linuxcnc and monitor latency? I would like to see which of the tools shows the correct values...

Thanks
DomCa

Hi tommylight,

thanks for the tip. I am building my CNC at the moment and do not have a machine to test with. And I am new to LinuxCNC...

Can I select the simulation when starting LinuxCNC? Will this also show the error? If yes, can I see/set the jitter limits set for the simulation?

Or do I hace to setup a machine with stepconf? Will this work if nothing is attached?

I want to get the PC with LinuxCNC running while I build my machine. That's why I am allready asking without the machine being finished...

Thanks for the support!
DomCa

There is sort of a way, there are some instructions in this thread.
forum.linuxcnc.org/38-general-linuxcnc-q.../31323-hal-histogram

I would be more inclined to trust the results from the latency plot or latency-histogram. There has been some discussion in the past about the ordinary latency test being slightly flawed, and not giving true real world results.

Hi Todd,

thanks for the info. I will have a look at the thread.

If the latency-plot is the correct one, I am in trouble...

Thanks,
DomCa

Hi andy and Todd,

thanks for the info.
I now run linuxcnc and monitor latency as shown in the thread linked to by Todd.

I can run the sim with constant max latency of 13000. That seem ok to me for a start with linuxcnc.

However, I think it is important to notice that latency-test and latency-plot show totally different values than the HAL histogram (which I take as the correct)...

Now I have to build my CNC...

Thanks for the support and keep up the good work!

Domca