When peole find the Python is slow, general it is because they are abusing Python and trying to use it as if it were C by doing things like writing "for loops" over a list. Then of course there is always the Python compeer that does translate Python to C.
But, yes I do end up using C for real-time work. The real problem is the low-end hardware. These little ARM boards, most often lack a powerful GPU that is needed for real-time 3D graphic rendering. The better GPUs will do all the heavy duty matrix algebra number crunching on the GPU. The GIU real does need to be running on a different process or different computer from any real-time loops. And you will never get good 3D graphic performance without a GPU. On Tue, Oct 10, 2017 at 10:23 AM, John Dammeyer <jo...@autoartisans.com> wrote: > I have a MPG on my ELS for the lathe and a ShuttleExpress for the MACH3 on > the CNC router. I too wouldn't be without some sort of MPG. Response time > on the 40MHz PIC is instant. I also find the ShuttlePro and keyboard > buttons response for jogging essentially instant on MACH3. > > Jogging MachineKit on the BBB is a joke with the path screen displayed. I > don't think it should be so I'll bring this up on the MachineKit for Beagle > forum. There's probably a parameter somewhere that fixes it. A single step > button click for 0.01 move shoots the processor activity up to 100% > > OTOH, go to the DRO screen (no tool path) and the keyboard feels like it's > attached to the stepper with instant jogging more like a 1.16GHz Athlon PC > 1GB RAM that is displaying tool path. Beagle Processor Activity bar drops > to 50% or less. > > If I were to draw a conclusion I'd say the overhead of screen updating is a > killer for the Beagle MachineKit. I read that AXIS is written in Python. > An pseudo real time application I did a few months ago using Python on a Pi3 > was quickly moved to C after we found the interpreted Python just couldn't > keep up. But again, I don't know what's happening under the covers. > > John > > > > >> -----Original Message----- >> From: Jon Elson [mailto:el...@pico-systems.com] >> Sent: October-10-17 9:13 AM >> To: Enhanced Machine Controller (EMC) >> Subject: Re: [Emc-users] MachineKit on the BeagleBone Black >> >> On 10/09/2017 09:00 PM, Frederic RIBLE wrote: >> > On 2017-10-10 00:02, Sebastian Kuzminsky wrote: >> > >> >> I don't know about machinekit, but in linuxcnc >> >> incremental jogs are safer than continuous jogs in high >> >> latency situations like these. >> >> >> > Same behavior with machinekit. >> > This is one of the motivations I have for adding physical >> > jog wheels on my machines. >> > >> Boy, I'll tell you, once I put a jog dial on my mill, I >> would NEVER want to be without it! We have this hideous >> Levil thing at work, and you are stuck with a finger pad on >> a laptop, and it goes and jogs without command all the time! >> I machine to top to clean up a face of a part all the time >> with the jog keys on my mill, but step down the Z with the >> jog dial. I can count out the clicks on the dial without >> looking. Very nice. >> >> Jon >> >> > ---------------------------------------------------------------------------- > -- >> Check out the vibrant tech community on one of the world's most >> engaging tech sites, Slashdot.org! http://sdm.link/slashdot >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users > > > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users -- Chris Albertson Redondo Beach, California ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
