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Profile c++ program in perf

I am Ubuntu 16.04 user. For profiling c++ program I use perf tool. So I run:

perf record ./myprogram myprogram_args
perf report 

Now as output I have:

  14,52%  CSim2Sim  libsimgrid.so.3.13.90  [.] lmm_solve
   4,40%  CSim2Sim  libsimgrid.so.3.13.90  [.] lmm_update_modified_set_rec
   4,05%  CSim2Sim  libc-2.23.so           [.] _int_malloc
   3,30%  CSim2Sim  libsimgrid.so.3.13.90  [.] simgrid::surf::Model::next_occuring_event_lazy
   2,19%  CSim2Sim  libc-2.23.so           [.] _int_free
........................................................................

I see only "depth" and library calls from my program. How can I get report from perf similar to this template? (something like this):

  4,52%  CSim2Sim  my_function1(int argc, char* argv[])
  3,52%  CSim2Sim  my_function2(int argc, char* argv[])
  3,52%  CSim2Sim  my_function3(int argc, char* argv[])
  1,52%  CSim2Sim  my_function4(int argc, char* argv[])
like image 997
Kenenbek Arzymatov Avatar asked Oct 21 '25 05:10

Kenenbek Arzymatov


1 Answers

Going from perf over info:perf to Perf Wiki, and finally to Tutorial - Perf Wiki

Source level analysis with perf annotate
...
perf annotate can generate sourcecode level information if the application is compiled with -ggdb. The following snippet shows the much more informative output for the same execution of noploop when compiled with this debugging information.

So compiling (and maybe linking?) with option -ggdb should do the trick.

Then you can use perf record to collect runtime information, and later analyze this with perf annotate.


I just found this answer to Alternatives to gprof [closed]. It recommends using gcc's option -fno-omit-frame-pointer, if you want to get call graph information. So, depending on what you want to achieve and your optimization level, you might need to add this option too.

like image 117
Olaf Dietsche Avatar answered Oct 23 '25 21:10

Olaf Dietsche



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