[cfe-dev] why empty output from gprof on gmon.out produced by Debug+Profile+Asserts/bin/clang?

[Larry Evans]

On 10/08/12 12:05, Larry Evans wrote:
> Compiling a moderately complex template c++ program with the
> clang in subject line produced a huge gmon.out:
> 
> -rw-r--r-- 1 evansl evansl 18016375 Oct  7 20:28 gmon.out
> 
> However, running gprof on that:
> 
> ~/prog_dev/boost-svn/ro/boost_1_49_0/sandbox/rw/variadic_templates/sandbox/slim/test
> $ gprof
> /home/evansl/download/llvm/svn/build/Debug+Profile+Asserts/bin/clang
> gmon.out > clangxx_dpa.gprof.txt&
> [gprof] 27132
> 
> took about 1.5 hrs and produced an empty clangxx_dpa.gprof.txt.
> 
> What might be going wrong?  I did try g++ -pg on a simple hello world
> program and gprof on that gmon.out did produce some output.
> Has anyone else tried using gprof to analyze where clang is
> spending its time?
> 
> What's the best way to get profile information about what's
> consuming most of the template processing time in clang?
> 
> TIA.
> 
> -regards,
> Larry

Tried the gprof without redirecting to a *.txt file, and now (after
about 1.5 hrs), a huge output is coming out.

I'm not sure why :(

-regards,
Larry