Date: Wed, 22 May 2013 10:04:41 -0400 From: Matthew Khouzam <[email protected]>
I was given an interesting corner case and want to explain how I believe it should be handled. You are given a trace with no timestamps, and n channels. How do you display the events? I propose (and have implemented) that we have a secondary fallback key to sort events. Right now, I believe babeltrace will sort by timestamp and that's it. The eclipse viewer sorts by timestamp and if timestamps match, it sorts by stream file name. In one given trace, stream file names are unique like (channel_0). This means if you have 5 stream files with five events each, it will always output as "stream1: e1-e2-e3-e4-e5 stream2: e1-e2-e3-e4-e5 stream3: e1-e2-e3-e4-e5 stream4: e1-e2-e3-e4-e5 stream5: e1-e2-e3-e4-e5" This should avoid confusion from a reader's perspective. Comments? ------------------------------ At first I thought this had to be wrong because trace events always have a time-stamp, but then I reread the CTF spec and, indeed, *all* of the event packet context fields are optional, so it is possible to have a timeless trace. In which case I agree with this design. Daniel U. Thibault Protection des systèmes et contremesures (PSC) | Systems Protection & Countermeasures (SPC) Cyber sécurité pour les missions essentielles (CME) | Mission Critical Cyber Security (MCCS) R & D pour la défense Canada - Valcartier (RDDC Valcartier) | Defence R&D Canada - Valcartier (DRDC Valcartier) 2459 route de la Bravoure Québec QC G3J 1X5 CANADA Vox : (418) 844-4000 x4245 Fax : (418) 844-4538 NAC : 918V QSDJ <http://www.travelgis.com/map.asp?addr=918V%20QSDJ> Gouvernement du Canada | Government of Canada <http://www.valcartier.drdc-rddc.gc.ca/> _______________________________________________ lttng-dev mailing list [email protected] http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
