How to profile a C++ doc

[titolorient]

Hi,
I have a C++ program and I want to profile it.
How to do it ?
I install gcc and g++ but I don't know how to do.
Thanks a lot for your help

[Zugzwang]

Here's some simple solution. Compile your program using the "-g" switch. If you don't know how to compile a program, look into the stickies and/or read this post (http://ubuntuforums.org/showthread.php?t=1258665).

Then install "valgrind" and run your program from the terminal using "valgrind --tool=callgrind ./insert_the_name_of_your_executable_here". A file with a name starting with "callgrind." will be created. Run "kcachegrind" on the file (install it beforehand) after your program has finished to see the results.

[titolorient]

Thanks,
I've tested it and that does'nt work when I've used your steps.
My prog is named 3DCHAP5.CPP and is on desktop.
So how to do to compil it and profile it.
Thanks again

[A_Fiachra]

Why is your code on the desktop???

That's sorta stupid.

Do you even know what a compiler is?



man gcc

[dwhitney67]

Why is your code on the desktop???

That's sorta stupid.

Do you even know what a compiler is?



man gcc


What difference does it make where the source file is located? Re-read your post and then ask yourself who is stupid.

[dwhitney67]

Thanks,
I've tested it and that does'nt work when I've used your steps.
My prog is named 3DCHAP5.CPP and is on desktop.
So how to do to compil it and profile it.
Thanks again

Install the development tools, if you haven't already done it:


sudo apt-get install build-essential

To build/run your application (using a terminal):


cd ~/Desktop
g++ -g 3DCHAP5.CPP
./a.out

If the compiler spews out errors during the compilation phase, then forget about running the application until you correct those errors.

[titolorient]

Thanks a lot

[A_Fiachra]

What difference does it make where the source file is located? Re-read your post and then ask yourself who is stupid.


gcc -c -Wall -g -I<path-to-includes> source.cpp -o source.o
gcc -g -L<path-to-libs> source.o -o source

is going to leave a source.o file on your desktop.

That practice makes the desktop cluttered.

I believe the practice is stupid. I never said you were stupid.

[titolorient]

Thanks a lot but what about profiling ??

[Zugzwang]

Thanks a lot but what about profiling ??

I've written a way how to do it in the second post. If there's something wrong with it, feel free to post us the corresponding error messages/problem description to get to know how to solve the problem.

[dwhitney67]

Thanks a lot but what about profiling ??

http://www.cs.utah.edu/dept/old/texinfo/as/gprof.html

Happy reading. :-)

[titolorient]

Bonjour,
I've tried, it seems to be ok.
How to find the PID in kcachegrind callgrind.pit.[PID]
How to find it which command to use.
There is what I have after using valgrind --tool=callgrind ./3DCHAP5modifie.CPP

==5776== Callgrind, a call-graph generating cache profiler.
==5776== Copyright (C) 2002-2008, and GNU GPL'd, by Josef Weidendorfer et al.
==5776== Using LibVEX rev 1884, a library for dynamic binary translation.
==5776== Copyright (C) 2004-2008, and GNU GPL'd, by OpenWorks LLP.
==5776== Using valgrind-3.4.1-Debian, a dynamic binary instrumentation framework.
==5776== Copyright (C) 2000-2008, and GNU GPL'd, by Julian Seward et al.
==5776== For more details, rerun with: -v
==5776==
==5776== For interactive control, run 'callgrind_control -h'.
: not founddifie.CPP: 1: //////////////////////////////////////////////////////////////////////////
==5777==
==5777== Events : Ir
==5777== Collected : 262282
==5777==
==5777== I refs: 262,282
./3DCHAP5modifie.CPP: 2: //: Permission denied
==5778==
==5778== Events : Ir
==5778== Collected : 275635
==5778==
==5778== I refs: 275,635
./3DCHAP5modifie.CPP: 3: //: Permission denied
==5779==
==5779== Events : Ir
==5779== Collected : 283303
==5779==
==5779== I refs: 283,303
./3DCHAP5modifie.CPP: 4: //: Permission denied
==5780==
==5780== Events : Ir
==5780== Collected : 292169
==5780==
==5780== I refs: 292,169
./3DCHAP5modifie.CPP: 5: //: Permission denied
==5781==
==5781== Events : Ir
==5781== Collected : 303965
==5781==
==5781== I refs: 303,965
./3DCHAP5modifie.CPP: 6: //: Permission denied
==5782==
==5782== Events : Ir
==5782== Collected : 315341
==5782==
==5782== I refs: 315,341
: not founddifie.CPP: 7: //////////////////////////////////////////////////////////////////////////
==5783==
==5783== Events : Ir
==5783== Collected : 319998
==5783==
==5783== I refs: 319,998
: not founddifie.CPP: 8:
./3DCHAP5modifie.CPP: 9: //: Permission denied
==5784==
==5784== Events : Ir
==5784== Collected : 342120
==5784==
==5784== I refs: 342,120
: not founddifie.CPP: 10:
./3DCHAP5modifie.CPP: 11: //: Permission denied
==5785==
==5785== Events : Ir
==5785== Collected : 355983
==5785==
==5785== I refs: 355,983
./3DCHAP5modifie.CPP: 14: cannot open ncurses.h: No such file
./3DCHAP5modifie.CPP: 15: //: Permission denied
==5786==
==5786== Events : Ir
==5786== Collected : 373993
==5786==
==5786== I refs: 373,993
: not founddifie.CPP: 19:
./3DCHAP5modifie.CPP: 20: //: Permission denied
==5787==
./3DCHAP5modifie.CPP: 20: MACROS: not found
: not founddifie.CPP: 21:
: not founddifie.CPP: 32:
==5787== Events : Ir
==5787== Collected : 396224
==5787==
==5787== I refs: 396,224
./3DCHAP5modifie.CPP: 33: //: Permission denied
==5788==
==5788== Events : Ir
==5788== Collected : 455908
==5788==
==5788== I refs: 455,908
: not founddifie.CPP: 34:
./3DCHAP5modifie.CPP: 35: //structurte: not found
==5789==
==5789== Events : Ir
==5789== Collected : 469795
==5789==
==5789== I refs: 469,795
./3DCHAP5modifie.CPP: 37: typedef: not found
: not founddifie.CPP: 54:
./3DCHAP5modifie.CPP: 54: unsigned: not found
: not founddifie.CPP: 54:
./3DCHAP5modifie.CPP: 54: }_palette: not found
: not founddifie.CPP: 54:
: not founddifie.CPP: 54:
: not founddifie.CPP: 54:
./3DCHAP5modifie.CPP: 54: //: Permission denied
==5790==
==5790== Events : Ir
==5790== Collected : 593013
==5790==
==5790== I refs: 593,013
./3DCHAP5modifie.CPP: 54: typedef: not found
: not founddifie.CPP: 54:
: not founddifie.CPP: 54:
./3DCHAP5modifie.CPP: 54: //: Permission denied
==5791==
==5791== Events : Ir
==5791== Collected : 658981
==5791==
==5791== I refs: 658,981
./3DCHAP5modifie.CPP: 54: typedef: not found
: not founddifie.CPP: 54: {
./3DCHAP5modifie.CPP: 54: int: not found
: not founddifie.CPP: 54:
./3DCHAP5modifie.CPP: 54: unsigned: not found
: not founddifie.CPP: 54:
: not founddifie.CPP: 54:
: not founddifie.CPP: 55:
./3DCHAP5modifie.CPP: 56: //: Permission denied
==5792==
==5792== Events : Ir
==5792== Collected : 751024
==5792==
==5792== I refs: 751,024
./3DCHAP5modifie.CPP: 57: typedef: not found
: not founddifie.CPP: 58: {
./3DCHAP5modifie.CPP: 59: float: not found
: not founddifie.CPP: 59:
./3DCHAP5modifie.CPP: 60: Syntax error: "}" unexpected
==5776==
==5776== Events : Ir
==5776== Collected : 794269
==5776==
==5776== I refs: 794,269


Thanks

[Zugzwang]

There is what I have after using valgrind --tool=callgrind ./3DCHAP5modifie.CPP


Sorry, but you are not applying "valgrind" on your compiled program but you rather try to apply it to your sourcecode.

First of all, rename your source code to have a lower-case file extension:


mv 3DCHAP5modifie.CPP 3DCHAP5modifie.cpp


Then compile it


g++ -g 3DCHAP5modifie.cpp -o 3dchaps


and then apply valgrind on the compiled program:


valgrind --tool=callgrind ./3dchaps

[titolorient]

Thanks a lot Zugzwang (http://ubuntuforums.org/member.php?u=403348)
Is it possible to know how exactely use as command to obtain the same result with gprof or/ and gconv.
Thanks

[Zugzwang]

Thanks a lot Zugzwang (http://ubuntuforums.org/member.php?u=403348)
Is it possible to know how exactely use as command to obtain the same result with gprof or/ and gconv.
Thanks


Please rephrase your question. It is hard to understand. Are you asking for a way to make valgrind producing precisely the same output as gprof? It is unlikely that such a feature exists, as it is unncessary.

If you want to know how to use gprof for profiling, then have a look at the page that dwhitney67 referred to. If you have problems understanding it, come back with precise questions.

[titolorient]

Hi
This is the steps done in the terminal and the messages obtained.
gcc -Wall -c -pg 3DCHAP5modifie1.cpp
3DCHAP5modifie1.cpp:54: warning: ‘typedef’ was ignored in this declaration
3DCHAP5modifie1.cpp:60: warning: ‘typedef’ was ignored in this declaration
3DCHAP5modifie1.cpp:69: warning: ‘typedef’ was ignored in this declaration
3DCHAP5modifie1.cpp:78: warning: ‘typedef’ was ignored in this declaration
3DCHAP5modifie1.cpp:86: warning: ‘typedef’ was ignored in this declaration
3DCHAP5modifie1.cpp:92: warning: ‘typedef’ was ignored in this declaration
3DCHAP5modifie1.cpp: In function ‘int main()’:
3DCHAP5modifie1.cpp:672: warning: deprecated conversion from string constant to ‘char*’
3DCHAP5modifie1.cpp:650: warning: unused variable ‘choix’
tarek@tarek-laptop:~/Bureau$ gcc -Wall -pg 3DCHAP5modifie1.o
3DCHAP5modifie1.o: In function `normalise(_3D*)':
3DCHAP5modifie1.cpp:(.text+0x165d): undefined reference to `sqrt'
3DCHAP5modifie1.o: In function `precalc()':
3DCHAP5modifie1.cpp:(.text+0x1b53): undefined reference to `sin'
3DCHAP5modifie1.cpp:(.text+0x1b7e): undefined reference to `cos'
3DCHAP5modifie1.o: In function `main':
3DCHAP5modifie1.cpp:(.text+0x1ce6): undefined reference to `operator delete[](void*)'
3DCHAP5modifie1.o:(.eh_frame+0x11): undefined reference to `__gxx_personality_v0'
collect2: ld returned 1 exit status
Now I don't know how to have a table who give me the results of profiling.
Thanks a lot.

[MadCow108]

you're missing a few objects or libraries to link against.
here are a few tips how to solve compiling problems.
http://ubuntuforums.org/showthread.php?t=691451

but why do you want to profile a program which you can't even compile yourself?
the information will probably be pretty useless for you

[Zugzwang]

Hi
This is the steps done in the terminal and the messages obtained.
gcc -Wall -c -pg 3DCHAP5modifie1.cpp


titolorient, please use the command for compiling&linking (plus adding "-pg" for gprof-profiling) that I've provided in post #13. You have to use "g++" instead of "gcc" for C++-programs as "gcc" does not link against the standard C++ libraries.

[jespdj]

gcc -c -Wall -g -I<path-to-includes> source.cpp -o source.o
gcc -g -L<path-to-libs> source.o -o source

is going to leave a source.o file on your desktop.
To compile C++ programs, you must use g++, not gcc, otherwise you'll get lots of error messages. So try this instead:

g++ -c -Wall -g source.cpp -o source.o
g++ -g source.o -o source

[titolorient]

Thanks a lot.
Just a small problem.
How to go after this prob on my program
warning: ‘typedef’ was ignored in this declaration
Thanks

[MadCow108]

its just a warning so it does not have to be a problem.
just check the code and see whats the reason for the warning and fix it (or not)

but I ask again: why do you want to profile something what you seemingly don't really understand?