> Date: Thu, 28 Nov 2013 15:46:31 +0530 > From: Anand Neeli <[email protected]> > >How can i create separate trace-file per app? > > As shown below, i have created two trace sessions and filtered based on > procname. > Is this the correct way? or is there any other efficient way to do it? > >./lttng create app_1_trace >./lttng enable-event -s app_1_trace -u -a --filter '$ctx.procname =="app_1"' >./lttng start app_1_trace > now run app_1 ./app_1 > >./lttng create app_2_trace >./lttng enable-event -s app_2_trace -u -a --filter '$ctx.procname =="app_2"' >./lttng start app_2_trace > now run app_2 ./app_2
You could trace the user events per process ID. Each process will then, during its existence, create its own mini-trace within the trace folder hierarchy. You can use babeltrace to merge all processes or to extract just one process's trace. Example: $ lttng create mysession $ lttng enable-channel mychannel --userspace --buffers-pid $ lttng enable-event --channel mychannel --userspace --all $ lttng start > now run app_1, app_2 Filters are nice but are fairly expensive CPU-wise. With per-process tracing, you can do all the requisite filtering after the fact. 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
