Profile c++ program in perf

Question

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[])

Have you tried [*this*](http://stackoverflow.com/a/378024/23771)? — Mike Dunlavey, Oct 31 '16 at 00:10

score 4 · Answer 1 · edited May 23 '17 at 12:33

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.

score 2 · Answer 2 · answered Oct 30 '16 at 17:22

2

I would also recommend using gprof(1). You'll compile your C (or C++) program by passing -pg (probably also with -O....) to gcc and/or g++ (perhaps change some CFLAGS or CXXFLAGS in your Makefile ). Read about instrumentation options of GCC.

answered Oct 30 '16 at 17:22

Basile Starynkevitch

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Profile c++ program in perf

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