I would like to learn more about profiling. In Eclipse CDT you have a button to trigger this action and it appears that (on Linux) it relies on perf as a default tool for this purpose.
I have installed perf and I'm exploring it's info and manpage. However I would also like to check how it's integrated into Eclipse CDT.
According to the official description no password is required to run the tool from the IDE. However I am getting
perf_event_open(..., PERF_FLAG_FD_CLOEXEC) failed with unexpected error 13 (Permission denied)
perf_event_open(..., 0) failed unexpectedly with error 13 (Permission denied)
Error:
You may not have permission to collect stats.
Consider tweaking /proc/sys/kernel/perf_event_paranoid,
which controls use of the performance events system by
unprivileged users (without CAP_SYS_ADMIN).
The current value is 3:
-1: Allow use of (almost) all events by all users
Ignore mlock limit after perf_event_mlock_kb without CAP_IPC_LOCK
>= 0: Disallow ftrace function tracepoint by users without CAP_SYS_ADMIN
Disallow raw tracepoint access by users without CAP_SYS_ADMIN
>= 1: Disallow CPU event access by users without CAP_SYS_ADMIN
>= 2: Disallow kernel profiling by users without CAP_SYS_ADMIN
To make this setting permanent, edit /etc/sysctl.conf too, e.g.:
kernel.perf_event_paranoid = -1
/usr/bin/perf record --output=perf.data /home/rbaleksandar/Projects/Eclipse/workspace1/GameEngine/build/cmake.debug.linux.x86_64/bin/GameEngine ge.json
Analysing recorded perf.data, please wait...
ERROR: Unable to find Perf version, please verify it is installed and on the run path
What should I do as a beginner profiler (pun intended)?
The answer is in the error message:
To make this setting permanent, edit /etc/sysctl.conf too, e.g.:
kernel.perf_event_paranoid = -1
Also you can find another answer here: