I am using perf from linux-2.6.36-gentoo-r4.  The /proc/sys/kernel/perf_event_paranoid is set to 0, so there should be no problems from there.Because long-running application I am profiling sometimes crashes for some indetermined reason (no information as to reason for it stopping working could be found by me), I turned to system-wide profiling with perf events.The application in question does parallelized numerical calculations, using MPI (Message Passing Interface) for communication.  Before running the application (with mpirun) I have started recording system-wide profile data on one of nodes it is run with:$ perf record -o perf.all.cycles,graph.data -g -e cycles -a &After I have realized that application crashed, I have killed the perf task.It had left$ du -sh perf.all.cycles,graph.data 14G     perf.all.cycles,graph.data14GB of data.  Unfortunately perf report doesn't support the -a switch.How can I analyze system-wide profiling data from perf tool?Added 2011.08.12Simply running perf report doesn't produce useful output:$ perf report -i perf.all.cycles,graph.data## (For a higher level overview, try: perf report --sort comm,dso)#That is the whole of output from 14GB profile data...
How to analyze profile data from `perf record --a` (system-wide collection)?
linux;perf event;profiling