On 10/8/2012 10:29 PM, emc-users-requ...@lists.sourceforge.net wrote: > have a machine that runs latency tests just fine and then gives me a > real-time error when I start LCNC. Never really tracked it down because I > always intended just to move on to a new machine. It can be frustrating. > I think the era of machines that fail latency peaked when the P4 was new, > but I'm not really sure about that. I suspect that Mach also runs better > on machines with low latency and the machines that LCNC complains about > also don't run Mach as well as they might. It's just that Mach ignores the > long intervals, mostly because step/dir machines are somewhat immune to > that issue. > Eric
These issues are why I am so strongly in favor of the dedicated microprocessor for the real time part. It is the norm in all computer systems- look inside that PC and Ill bet there are a dozen separate processors doing things like graphics, network, disk control, etc. PCs are wonderful GUI devices and have great computational ability. They were never designed to be real time systems. Why are some people so hung up on the idea that one box (even a box full of micros) must be used as the machine control? step/dir machines are not immune to timing glitches. My knee mill uses a stepper on the knee for Z. I had a frequent glitch that lost position. I replaced the stepper with a BIG servo and had the same problem. I replaced the parallel port with a smoothstepper and the problem was solved- I put the stepper back and have never had a lost Z step. With low cost motion devices like smoothstepper, pokeys, kflop, centipede, etc it seems clear to me that fighting real time latency issues on PCs are a waste of effort. ron ginger ------------------------------------------------------------------------------ Don't let slow site performance ruin your business. Deploy New Relic APM Deploy New Relic app performance management and know exactly what is happening inside your Ruby, Python, PHP, Java, and .NET app Try New Relic at no cost today and get our sweet Data Nerd shirt too! http://p.sf.net/sfu/newrelic-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
