Hi folks, Dmitry Adamushko schrieb: > > Hi there, > > after a preliminary discussion with Philipe and, well, a few days later > than I expected, I'm starting a new effort of writting some simple (i.e. > not > too complex :) yet, hopefully, useful benchmarking utilites. > > The idea of each utility is to emulate a certain use case but > at the level which is significant enough to prove that > the system is (or is not) working properly latency-wise. > This, hopefully, will help to determine some bottlenecks and > the parts of code that need to be reworked/tweaked. > Then we may use such tests on release-by-release basis as indicators > of either progress or regress we are making with a certain release.
Actually, I'm doing here some measurementstuffs to compare the Realtime Performance of Xenomai and Preempt-RT stuffs. :-) > > As an example, the first utility would implement the following use case : > > (based on the latency program) > > - a given number of periodic threads are running; > > - configurable periods (so that e.g. a few threads can become active > at the same moment of time). Actually, that's what we would need. > > - timer : periodic or apperiodic; I've already implemented something in this way in POSIX. I took the accuracy.c out of the posix demo from Gille and changed it. So that you can start few threads with different nsleep duration. Except that it writes a log, which can be plotted. The util does quite the same stuffs like the cyclictest by Thomas Gleixner. Further I implemented a tool for Interruptmeasurement with rtdm. Still tuning on it, because the Pre-RT Kernel get ocassionally problems with stability. I even implemented Rhealstone Benchmark with xenomai-complaint Posix, it however provides only middlevalues and might not be very interesting. > > ... > > the utility will not likely produce any screen-output during its work, but > rather the comprehensive statistic in a handy form after finishing. > Exactly what I thought :-) > --- > > other utils could make use of some scenarious where synch. primitives/ > rt_queue's/pipes could be highly used etc. > Generally I'm quite interested on some xenomai specific latency behaviour caused by i.E. Domain Switching, Function Wrapping and so on. I'm still considering on some concrete Workload-scenarious. > > I guess, Xenomai already provides a valid amount of functionality and it's > quite stable for the time being. So it's time to work on optimizing it! > > Everyone is wellcome to come up with any scenarios on which such utilities > could be based. > > Any comments on the one with a given number of threads are wellcome too. > I'm now busy writing my stuffs together. no time to debug my hacks. so I think I'd release them somehow later some time after I've given them first to Jan for quice code review. > > -- > Best regards, > Dmitry Adamushko > > > ------------------------------------------------------------------------ > > _______________________________________________ > Xenomai-core mailing list > Xenomai-core@gna.org > https://mail.gna.org/listinfo/xenomai-core Cheers Luotao Fu
