Profiler for C code

This is a discussion on Profiler for C code within the C Programming forums, part of the General Programming Boards category; Hi everyone, I'm new here. I'm an italian student of informatic engineering. I'm looking for a C profiler. I try ...

  1. #1
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    Profiler for C code

    Hi everyone, I'm new here. I'm an italian student of informatic engineering. I'm looking for a C profiler. I try to use gprof but without success (even if I compile with -pg option). I try even Valgrind, but it's the same. Can anyone help me? Btw, I have a MacBook.
    Thanks for the help!

  2. #2
    spurious conceit MK27's Avatar
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    Okay, here's how to use gprof:

    1) compile: gcc -pg -fprofile-arcs -ftest-coverage
    2) now run the executable once, this will create a file "gmon.out"
    3) then gprof -b ./a.out (or the exe name).
    C programming resources:
    GNU C Function and Macro Index -- glibc reference manual
    The C Book -- nice online learner guide
    Current ISO draft standard
    CCAN -- new CPAN like open source library repository
    3 (different) GNU debugger tutorials: #1 -- #2 -- #3
    cpwiki -- our wiki on sourceforge

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    Registered User jeffcobb's Avatar
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    OK the MacBook is your problem to solve

    All joking aside, what about gprof did not work for you?

    As for Valgrind, that is a memory/leak checking tool, not a profiler...


    So if you can explain a little better what went wrong, maybe we can help you...
    C/C++ Environment: GNU CC/Emacs
    Make system: CMake
    Debuggers: Valgrind/GDB

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    Registered User jeffcobb's Avatar
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    Quote Originally Posted by MK27 View Post
    Okay, here's how to use gprof:

    1) compile: gcc -pg -fprofile-arcs -ftest-coverage
    2) now run the executable once, this will create a file "gmon.out"
    3) then gprof -b ./a.out (or the exe name).
    You beat me to it. I was going to try to get the OP to do some of the leg-work himself. You are too fast!

    Happy Tuesday...
    C/C++ Environment: GNU CC/Emacs
    Make system: CMake
    Debuggers: Valgrind/GDB

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    Jack of many languages Dino's Avatar
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    Why not use Xcode tools?
    Mac and Windows cross platform programmer. Ruby lover.

    Quote of the Day
    12/20: Mario F.:I never was, am not, and never will be, one to shut up in the face of something I think is fundamentally wrong.

    Amen brother!

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    spurious conceit MK27's Avatar
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    Quote Originally Posted by jeffcobb View Post
    I was going to try to get the OP to do some of the leg-work himself.
    Oh yuck -- you need to contemplate my signature Jeff. The gprof man page is one of many still used in the FIFTH CIRCLE OF HELL!!!
    C programming resources:
    GNU C Function and Macro Index -- glibc reference manual
    The C Book -- nice online learner guide
    Current ISO draft standard
    CCAN -- new CPAN like open source library repository
    3 (different) GNU debugger tutorials: #1 -- #2 -- #3
    cpwiki -- our wiki on sourceforge

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    Quote Originally Posted by MK27 View Post
    Okay, here's how to use gprof:

    1) compile: gcc -pg -fprofile-arcs -ftest-coverage
    2) now run the executable once, this will create a file "gmon.out"
    3) then gprof -b ./a.out (or the exe name).
    But in (1) before "coverage" I insert my source code right? gcc -pg -fprofile-arcs -ftest-coverage myprog.c

    Quote Originally Posted by jeffcobb View Post
    OK the MacBook is your problem to solve
    I can say the same thing for other OS

    The code I want to profile is libsvm, if someone know. To compile this I do "make" in the dir and it compile svm-train and svm-predict.
    This what "makefile" file contains:
    Code:
    CXX ?= g++
    CFLAGS = -Wall -Wconversion -O3 -fPIC
    SHVER = 1
    
    all: svm-train svm-predict svm-scale
    
    lib: svm.o
    	$(CXX) -shared svm.o -o libsvm.so.$(SHVER)
    
    svm-predict: svm-predict.c svm.o
    	$(CXX) $(CFLAGS) svm-predict.c svm.o -o svm-predict -lm
    svm-train: svm-train.c svm.o
    	$(CXX) $(CFLAGS) svm-train.c svm.o -o svm-train -lm
    svm-scale: svm-scale.c
    	$(CXX) $(CFLAGS) svm-scale.c -o svm-scale
    svm.o: svm.cpp svm.h
    	$(CXX) $(CFLAGS) -c svm.cpp
    clean:
    	rm -f *~ svm.o svm-train svm-predict svm-scale
    I need to profile svm-train and svm-predict, where I put -pg and other things?
    I'm new in profiling and I need some help Thanks

  8. #8
    spurious conceit MK27's Avatar
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    Quote Originally Posted by guess85 View Post
    I need to profile svm-train and svm-predict, where I put -pg and other things?
    I'm new in profiling and I need some help Thanks
    Try adding it to CFLAGS.
    C programming resources:
    GNU C Function and Macro Index -- glibc reference manual
    The C Book -- nice online learner guide
    Current ISO draft standard
    CCAN -- new CPAN like open source library repository
    3 (different) GNU debugger tutorials: #1 -- #2 -- #3
    cpwiki -- our wiki on sourceforge

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    Quote Originally Posted by MK27 View Post
    Try adding it to CFLAGS.
    Thanks, I try to do it.

  10. #10
    Registered User jeffcobb's Avatar
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    Yeah but I know how to profile my code
    C/C++ Environment: GNU CC/Emacs
    Make system: CMake
    Debuggers: Valgrind/GDB

  11. #11
    Registered User jeffcobb's Avatar
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    Quote Originally Posted by MK27 View Post
    Oh yuck -- you need to contemplate my signature Jeff. The gprof man page is one of many still used in the FIFTH CIRCLE OF HELL!!!
    Actually I have a couple of really *really* nice volumes here that go into detail on that and all is explained well with plenty of example code.

    And I am here to help...when I first got here I would jump on any request for code and post full working solutions to everything....until I realized the number of ppl coming here waiting for the answer to just be handed to them. I have a wife, the only person I work for unconditionally for free. Others must pay and if not monetarily (nothing that I am suggesting) then through gaining personal knowledge and experience, the latter of which can be the greatest teacher of all, IMHO....this is what working in FOSS has brought to me and one of its greatest virtues: not the free code, free support, security et al: free education...


    I dunno, maybe if we had just !had that rash flea-bags posting home-work and demanding answers w/o being willing to even *try* to do the coding I might have answered differently. And the MacBook *is* his problem

    I am not picking on him; I tease all of my Apple friends.
    C/C++ Environment: GNU CC/Emacs
    Make system: CMake
    Debuggers: Valgrind/GDB

  12. #12
    Captain Crash brewbuck's Avatar
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    I have altered the below to set the correct flags for profiling. Those changes are marked in blue.

    Quote Originally Posted by guess85 View Post
    Code:
    CXX ?= g++
    PROFILE = -pg
    CFLAGS = -Wall -Wconversion -O3 -fPIC $(PROFILE)
    SHVER = 1
    
    all: svm-train svm-predict svm-scale
    
    lib: svm.o
    	$(CXX) -shared svm.o -o libsvm.so.$(SHVER) $(PROFILE)
    
    svm-predict: svm-predict.c svm.o
    	$(CXX) $(CFLAGS) svm-predict.c svm.o -o svm-predict -lm
    svm-train: svm-train.c svm.o
    	$(CXX) $(CFLAGS) svm-train.c svm.o -o svm-train -lm
    svm-scale: svm-scale.c
    	$(CXX) $(CFLAGS) svm-scale.c -o svm-scale
    svm.o: svm.cpp svm.h
    	$(CXX) $(CFLAGS) -c svm.cpp
    clean:
    	rm -f *~ svm.o svm-train svm-predict svm-scale
    Code:
    //try
    //{
    	if (a) do { f( b); } while(1);
    	else   do { f(!b); } while(1);
    //}

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