On 03/13/2015 09:52 AM, sam sokolik wrote: > I still cannot believe that it is possible. I have been testing 2.7+ > uspace for a while now. It defiantly opens up options. > > I just did some comparison tests between rtai and uspace, on a 2 GHz Pentium 4 system. I found uspace had a LITTLE bit more jitter on the servo thread. I got about +/- 10 us jitter on the encoder position sampling pulse with my Universal PWM Controller using rtai. With uspace, it was about +/- 20 us. Even the 20 us jitter is only 2% of the 1 ms period. I watched for a while for outliers, and did not see any.
I'm pretty sure I could go up to 2 KHz servo thread with either RT system with my boards as well. Total time to do the servo thread was about 150 us under both RT systems, including using the velocity estimation feature, which requires reading 10 more registers from the controller board. Jon ------------------------------------------------------------------------------ Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
