> -----Original Message----- > From: Peter C. Wallace [mailto:p...@mesanet.com] > > > > The ARMs and current crop of PCs are orders of magnitude faster and more > > powerful so why is it that the real time part of Linux isn't the defacto > > standard for Linux. If it were wouldn't the latest LinuxCNC run on just > > about anything? > > > > Seems a simple question. Is there a simple answer? > > > > John Dammeyer > > > > > Preempt-RT will be mainlined into stock linux fairly soon now so its just > becomes a kernel config option but I doubt real time kernels will ever be > standard for common desktop distributions as they typically have > lower performance (excluding latency) than non RT kernels > Lower performance? That seems like an urban legend rather than fact. Or to be more precise, when a bench mark is run on the Preempt-RT it runs slower than on the current standard system. And given the speed of processors and that memory, disk and display are the limiting factors how is that even valid for CNC systems? Even on desktops. Is the Linux world so focused on video games that require optimum graphics performance.
The push (and market) in both the windows CNC world and clearly in the LinuxCNC is for external hardware to do the physical real time part for stepping and encoders especially for new hardware. Like the MACH3 world for people happily running LinuxCNC turning out parts are treating their equipment like a tool. If the tool isn't broken and does the job most won't replace it. In either case that turns the main box part into something that is nothing but a trajectory planner and a graphical display interface. All it has to do is provide the motion information to the control part in a timely fashion. John Dammeyer ------------------------------------------------------------------------------ Transform Data into Opportunity. Accelerate data analysis in your applications with Intel Data Analytics Acceleration Library. Click to learn more. http://pubads.g.doubleclick.net/gampad/clk?id=278785231&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
