2009/6/27 Eric H. Johnson <ejohn...@camalytics.com>: > There is a tutorial on building EMC for an SMP kernel here: > http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?EMC_With_Custom_Kernel > Packages are here (which I assume you already found): > http://linuxcnc.org/experimental/hardy/smp/ > > If you just want to install the EMC smp packages, you only need to do > section 6.3 on.
Well, I finally got round to trying this, and it seems that it was well worth it. My base period jitter has gone from 20,000 to 2,509 which seems a quite unfeasible improvement. The next thing to do is to make use of this improvement: Stepconf always seems to use 100,000 base thread and 1,000,000 servo thread regardless of the input parameters used for drive timings and latency. Is this normal? Where are the step, space and direction-hold timings defined? I couldn't see anything explicit in the INI files, but perhaps I was not looking carefully enough. (Or are these always exactly one thread period). My main interest is in running a faster thread to read the spindle encoder. Currently I have the pulses connected through a HAL software filter, but I am running into problems with the granularity (for want of a better word) of the thread that the filter runs in. If I sample over 2 periods then I start losing encoder pulses to the filter at the moment. (You might note from another thread that I am investigating hardware filtering too) Any suggestions for values for BASE_THREAD and SERVO _THREAD with a 2509 latency? -- atp ------------------------------------------------------------------------------ Come build with us! The BlackBerry® Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9-12, 2009. Register now! http://p.sf.net/sfu/devconf _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
