I did not do it for emc .... I hinted that we should look at doing it. I have used exactly the code you linked for my rt-code .... ( not EMC ) ... basicly you mlockall() and then fault all pages you are going to use, after tuning glibc to never trim the heap.
So basicly lock all rt parts in memory .... fault all pages and then run. / Lars. 2012/9/14 Michael Haberler <mai...@mah.priv.at>: > > Am 14.09.2012 um 06:30 schrieb Kent A. Reed: > >> With the RT PREEMPT system, this board gives lousy results even running >> headless. Using latency-test, for some minutes I see the base (25us) >> thread showing a max latency of anywhere from 25us to 40us and the servo >> (1000us) thread 40us to 50us. Then, the servo thread pops a bit and the >> base thread pops a lot, to about 110us. At the same time, the kernel >> throws three lines to the console >> >> "ERROR: Missed scheduling deadline for task 0 [nnnn times] >> "Now is xxxxx.xxx, deadline is xxxxx.xxx >> "Absolute number of pagefaults in realtime context: 1030" > > I guess this could be mitigated by pre-page faulting all RT code into memory > > this example deals with the issue: > https://rt.wiki.kernel.org/index.php/Threaded_RT-application_with_memory_locking_and_stack_handling_example > > Lars: you also hinted at that - how did you do it? > > -m > ------------------------------------------------------------------------------ > Got visibility? > Most devs has no idea what their production app looks like. > Find out how fast your code is with AppDynamics Lite. > http://ad.doubleclick.net/clk;262219671;13503038;y? > http://info.appdynamics.com/FreeJavaPerformanceDownload.html > _______________________________________________ > Emc-developers mailing list > Emc-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-developers ------------------------------------------------------------------------------ Got visibility? Most devs has no idea what their production app looks like. Find out how fast your code is with AppDynamics Lite. http://ad.doubleclick.net/clk;262219671;13503038;y? http://info.appdynamics.com/FreeJavaPerformanceDownload.html _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
