On 8/11/2013 9:46 AM, Michael Haberler wrote: > Am 11.08.2013 um 15:19 schrieb Charles Steinkuehler > <[email protected]>: > >> On 8/5/2013 11:29 AM, Charles Steinkuehler wrote: >>> How does LinuxCNC behave under heavy CPU load? >>> >>> <...> >> I am revisiting this issue after experimenting with some alternate user >> interfaces and a discussion with David Bagby. >> >> David indicated he would repeatedly run a familiar gcode program on his >> shapoko and it would sometimes just "sound wrong". I have also tested a >> variety of interfaces and noticed that if I am running a program in the >> mini interface and I enable the "backplot" display, it causes the >> steppers to dramatically slow down and/or stutter, and change from their >> 'singing' tones to more of a 'grinding' type noise while the backplot is >> initially loading. >> >> <...> > <...> > > the "backplot" hint sounds suspicious. Is there some OpenGL-related code, or > feeding of rendering hardware in the kernel which might be less-than-brightly > coded? maybe the bug can be observed in latency spikes with glxgears too? > >
I think this an interesting case in itself even if it doesn't prove to be the reason for your bad prints. I didn't try the mini GUI when I was looking at the computational burden imposed on my BBB by LCNC but turning on the backplot in other GUIs certainly kicked up the numbers reported by 'top'. Do you see/hear the effect only while loading the backplot or does it continue as long as the backplot is running? How loaded is the CPU? Is there any swapping going on? What GUI is David running? Has he also observed the behavior you report? Sorry I'm not in a position just now to replicate your results. Regards, Kent ------------------------------------------------------------------------------ Get 100% visibility into Java/.NET code with AppDynamics Lite! It's a free troubleshooting tool designed for production. Get down to code-level detail for bottlenecks, with <2% overhead. Download for free and get started troubleshooting in minutes. http://pubads.g.doubleclick.net/gampad/clk?id=48897031&iu=/4140/ostg.clktrk _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
