On Thu, Feb 28, 2013 at 9:10 PM, Gilles Chanteperdrix <[email protected]> wrote: > On 02/28/2013 08:19 PM, Ronny Meeus wrote: > >> Hello >> >> we are using the PSOS interface of Xenomai forge, running completely >> in user-space using the mercury code. >> We deploy our application on different processors, one product is >> running on PPC multicore (P4040, P4080, P4034) and another one on >> Cavium (8 core device). >> The Linux version we use is 2.6.32 but I would assume that this is not >> so relevant. >> >> Our Xenomai application is running on one of the cores (affinity is >> set), while the other cores are running other code. >> >> On both architectures we recently start to see issues that one thread >> is consuming 100% of the core on which the application is pinned. >> The thread that monopolizes the core is the thread internally used to >> manage the timers, running at the highest priority. >> The trigger for running into this behavior is currently unclear. >> If we only start a part of the application (platform management only), >> the issue is not observed. >> We see this on both an old version of Xenomai and a very recent one >> (pulled from the git repo yesterday). >> >> I will continue to debug this issue in the coming days and try isolate >> the code that is triggering it, but I can use hints from the >> community. >> Debugging is complex since once the load starts, the debugger is not >> reacting anymore. >> If I put breakpoints in the functions that are called when the timer >> expires (both oneshot and periodic), the process starts to clone >> itself and I endup with tens of them. >> >> Has anybody seen an issue like this before or does somebody has some >> hints on how to debug this problem? > > > First enable the watchdog. It will send a signal to the application when > detecting a problem, then you can use the watchdog to trigger an I-pipe > tracer trace when the bug happens. You will probably have to increase > the watchdog polling frequency, in order to have a meaningful trace. >
I don't think an I-pipe tracer will be possible when using the Mercury core, right (xenomai-forge) ? Best regards, Thomas _______________________________________________ Xenomai mailing list [email protected] http://www.xenomai.org/mailman/listinfo/xenomai
