On Sun, 3 Jan 2016, Niemand Sonst wrote: > Date: Sun, 3 Jan 2016 19:59:41 +0100 > From: Niemand Sonst <nie...@web.de> > Reply-To: EMC developers <emc-developers@lists.sourceforge.net> > To: EMC developers <emc-developers@lists.sourceforge.net> > Subject: Re: [Emc-developers] Difference RTAI 5.0 <--> PREEMPT-rt ? > > Yes, > > in some words: > > RTAI is much faster, but relies on the kernel you have, so it is much > more complicated to be included in software parts. > It is mostly needed only for very high speed applications > > PREEMPT-RT is a a little bit slower than RTAI, but can be implemented in > software much easier, just imagine it is a modul. > > That is very simple explained, there are more differences. For a normal > CNC opperation both should work fine. But if you use i.e. software > stepgenerator over a LPT, than take the RTAI. > > Norbert
Depending on the hardware the differences between RTAI and Preempt-RT may be minimal: http://freeby.mesanet.com/g3258-rtai.png http://freeby.mesanet.com/h97-g3258-preemt-rt.png Both about 1/2 a day of YouTube videos (I favor the crackling fireplace ones) and 10 glxgears each I'll try some Skylake hardware when I can figure out how to build the latest (4.4-rc6-rt1) Preempt-RT kernel Note that both the latency test and latency histogram mainly display _dispatch_ latency. Actual latency to _do_ anything (allocate memory, do I/O, access the PCI bus, etc) will be significantly worse Peter Wallace Mesa Electronics ------------------------------------------------------------------------------ _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
