Hi,Mathieu: > It all looks fine so far. Note that the Linux scheduler can decide to > schedule your 2 threads on the same CPU. How do you detect that there is > a "problem": is it that events you are writing from a specific thread > are missing or that you expect events on CPU 1 and don't have any ? > I can monitor which cpu core my threads are running on by the function: sched_getcpu() . the events are missing in other core.
thanks On Fri, 2010-08-13 at 08:24 -0400, Mathieu Desnoyers wrote: > * Fu Juntang(David) ([email protected]) wrote: > > Hi,Mathieu: > > Please see my answer inline: > > > > On Thu, 2010-08-12 at 09:40 -0400, Mathieu Desnoyers wrote: > > > * Fu Juntang(David) ([email protected]) wrote: > > > > Hi,Mathieu: > > > > I have found another UST bug in this multi-thread functions: > > > > in my SMP host(2 cpu cores),I have found that UST can only collect one > > > > thread trace logs running one core(CPU_1),but can not collect the > > > > other thread trace logs running another core(CPU_0),is this a known > > > > bug? > > > > if you need my debug logs, I can attach it to you. > > > > [...] > > > Can you try putting a printf in > > > > > > ust/libust/buffer.c: get_n_cpus() to see how many CPUs the library > > > detects ? > > > > > yes,sure, the output says that it detects 2 cpus > > > > > What does your usttrace directory looks like ? (the subdir containing > > > the ust and metadata files... with ls -al) > > > > > total 24 > > drwxr-xr-x 2 david david 4096 2010-08-13 15:30 . > > drwxr-xr-x 3 david david 4096 2010-08-13 15:30 .. > > -rw------- 1 david david 4096 2010-08-13 15:30 metadata_0 > > -rw------- 1 david david 4096 2010-08-13 15:30 metadata_1 > > -rw------- 1 david david 4096 2010-08-13 15:30 ust_0 > > -rw------- 1 david david 4096 2010-08-13 15:30 ust_1 > > > > It all looks fine so far. Note that the Linux scheduler can decide to > schedule your 2 threads on the same CPU. How do you detect that there is > a "problem": is it that events you are writing from a specific thread > are missing or that you expect events on CPU 1 and don't have any ? > > The latter case could be normal. > > Thanks, > > Mathieu > _______________________________________________ ltt-dev mailing list [email protected] http://lists.casi.polymtl.ca/cgi-bin/mailman/listinfo/ltt-dev
