Jérémie, can you have a look at these questions ? Thanks,
Mathieu * Salman Rafiq ([email protected]) wrote: > Hello All, > > In continuation to my previous questions related to reading CTF traces from > particular timestamp, I can now further summarize few problems/questions I > have: > > > 1. Is it possible to seek CTF file_stream using 'begin' and 'end' > iterator position i.e. BT_SEEK_TIME? > > > > a. We cannot use babel trace API for CTF iterator creation using > defined start and end position based on time. Seems this is in progress? > > b. The other possible solution I am using, is to create the iterator > using defaults, and then later use API to 'create iterator time position > based on Raw Timestamp (only takes raw time)' and then 'set iterator position > to that timed position'. > > > > 2. But, since the area of interest for me was only the time when user > application which I am tracing using Lttng-kernel tracer, started recording > events (application use external trace recording format). > > User application contains a definition file which tells me the epoch time (us > resolution) when it started and stopped tracing. I wanted to use this > information to set iterator positions. > > > > a. Question is Can I convert this time to raw time which babeltrace API > takes as an argument? > > b. Or Is there any way to read Clock struct from CTF metadata file (is > there any scope defined for this), so that I can extract offset variable > value to convert epoch time from other trace to raw time? > > > It will be really great if I can get few suggestions/help related to these > issues. > Thanking in anticipation! > > > Best Regards, > > Salman Rafiq > Research Engineer > Industrial Communication > Fraunhofer-Einrichtung für Systeme der Kommunikationstechnik ESK > > Hansastraße 32 | 80686 München > Telefon, Fax: +49 89 547088-356 | +49 89 547088-66-356 > E-Mail: [email protected]<http://www.esk.fraunhofer.de/> > > Internet: > http://www.esk.fraunhofer.de<http://www.esk.fraunhofer.de/> > http://www.facebook.com/FraunhoferESK > http://www.twitter.com/FraunhoferESK > > Von: Salman Rafiq [mailto:[email protected]] > Gesendet: Mittwoch, 18. Juli 2012 15:28 > An: [email protected] > Betreff: [lttng-dev] Reading CTF trace from time T > > Hello All, > > I am tracing a user application using lttng kernel tracer, i.e., > > Start lttng kernel trace > ./application > Stop lttng kernel trace > > Before I was reading kernel CTF trace using babeltrace API's from beginning > of trace, e.g., > struct bt_iter_pos begin_pos > struct bt_ctf_iter *iterator > > begin_pos.type = BT_SEEK_BEGIN > iterator = create_iterator(context, &begin_pos, NULL) > .. and then read events start from that iterator postion. > > Recently, I have been trying to seek trace using timestamp from when the > application started to application end. > I would like to know if I am doing it right. Would the method below enough to > achieve this? Or I am missing something here :-S > > begin_pos.type = BT_SEEK_TIME > end_pos.type = BT_SEEK_TIME > > begin_pos.u.seek_time = timestamp1 (for now manually taken from CTF kernel > trace when application started) > end_pos.u.seek_time = timestamp2 (for now manually taken from CTF kernel > trace when application ended) > > iterator = create_iterator(context, &begin_pos, &end_pos); > and then with reading events at iterator position until end_pos. > > > I am using babeltrace package version "1.0.0-pre4". > Any help related to achieving this functionality will be highly appreciated. > > Best Regards, > Salman > > > -- > Salman Rafiq > Industrial Communication > Fraunhofer-Einrichtung für Systeme der Kommunikationstechnik ESK > > Hansastraße 32 | 80686 München > Telefon, Fax: +49 89 547088-356 | +49 89 547088-66-356 > E-Mail: [email protected]<http://www.esk.fraunhofer.de/> > > Internet: > http://www.esk.fraunhofer.de<http://www.esk.fraunhofer.de/> > http://www.facebook.com/FraunhoferESK > http://www.twitter.com/FraunhoferESK > Content-Description: ATT00001.txt > _______________________________________________ > lttng-dev mailing list > [email protected] > http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev -- Mathieu Desnoyers EfficiOS Inc. http://www.efficios.com _______________________________________________ lttng-dev mailing list [email protected] http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
