CODEWITHSUNDEEP
cprofilingopenmpgnu
mOna
mOna

Reputation: 2459

Line level profiling of a C program by GNU

Could Someone kindly tell me how can I profile single lines or blocks of code of a program in C with GNU profiler? I used gprof ./a.out gmon.out which gives me flat profile and Call graph. However, I would like to see lines that are more frequently accessed.

Thanks,

Upvotes: 0

Views: 797

Answers (2)

mOna
mOna

Reputation: 2459

Ok, I'll post this answer so if some newbie like me searched for it can find it faster :) here are the steps: source

  1. gcc -fprofile-arcs -ftest-coverage fourcefile.c (At the end of compilation files *.gcno will be produced)
  2. Run the executable.
  3. Run gcov: gcov sourcefile.c (At the end of running, a file (*.gcov) will be produced which contains which contains all the required info)

Upvotes: 0

IdeaHat
IdeaHat

Reputation: 7881

This is probably one of those things that you just don't know the term you should've googled, so I'll answer it:

The term you are looking for is "annotation"-you want to annotate the source and see the line by line hits in the code.

Calling gprof with the -A flag will dump out the samples on each line that were caught.

See Also:

https://sourceware.org/binutils/docs/gprof/Annotated-Source.html

Upvotes: 1

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