How does LinuxCNC behave under heavy CPU load? I am experiencing some errors in my 3D prints that look very much like part of the gcode got lost or skipped over* (I'll try to post pics or a video). This is happening a few times in multi-hour prints, so I haven't yet actually _seen_ this happen, I just see the results in the final print.
I have not gotten any real-time errors or warnings, so I don't think it's anything at the HAL level or below, but on the BeagleBone, the CPU usage easily hits 100%, and the SD-card "hard disk" is also pretty slow (note that I am printing gcode files in the 2 MB to 10 MB size range, with lots of small line segments). Before I start seriously diving into debugging this, what is the expected behavior of LinuxCNC if the non-real-time task is starved for CPU and/or HDD bandwidth? Is it *EVER* possible for the non-RT code to 'skip over' any gcode? Is it possible some delay in the non-RT code would temporarily cause a large following error? That could explain what I'm seeing as well. I currently have units set to mm, and the following error for each axis set to: FERROR = 1.0 MIN_FERROR = 0.25 Since I'm printing apx. 0.5 mm wide ribbons of plastic, if the following error could get big enough so the current layer doesn't stick to the layer below (ie: plastic squirting into free space) until the error gets small enough the layers overlap again. * I am printing vases, and the final print ends up with a string of plastic connecting two points on the perimeter of the vase, basically taking the "as the crow flies" direct route between two points instead of following the expected convex or concave curve of the vase. The vases are 'organic' and curvy, so they are made up of lots of tiny line segments, if that matters: http://www.thingiverse.com/thing:104694 -- Charles Steinkuehler [email protected]
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