Profiler for C code

guess85 · 02-09-2010, 10:55 AM

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!

MK27 · 02-09-2010, 11:03 AM

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).

jeffcobb · 02-09-2010, 11:03 AM

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...

jeffcobb · 02-09-2010, 11:04 AM

Quote:

Originally Posted by MK27

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...

Dino · 02-09-2010, 11:04 AM

Why not use Xcode tools?

MK27 · 02-09-2010, 11:08 AM

Quote:

Originally Posted by jeffcobb

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!!!

guess85 · 02-09-2010, 11:16 AM

Quote:

Originally Posted by MK27

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

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

MK27 · 02-09-2010, 11:19 AM

Quote:

Originally Posted by guess85

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.

guess85 · 02-09-2010, 11:46 AM

Quote:

Originally Posted by MK27

Try adding it to CFLAGS.

Thanks, I try to do it.

jeffcobb · 02-09-2010, 11:46 AM

Yeah but I know how to profile my code

jeffcobb · 02-09-2010, 11:52 AM

Quote:

Originally Posted by MK27

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.

brewbuck · 02-09-2010, 12:27 PM

I have altered the below to set the correct flags for profiling. Those changes are marked in blue.

Quote:

Originally Posted by guess85

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

02-09-2010, 10:55 AM	#1
guess85 Registered User Join Date: Feb 2010 Posts: 3	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!
guess85 is offline

02-09-2010, 11:03 AM	#2
MK27 critical genius Join Date: Jul 2008 Location: SE Queens Posts: 5,198	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). __________________ "A man can't just sit around." -- Larry Walters
MK27 is offline

02-09-2010, 11:03 AM	#3
jeffcobb Registered User Join Date: Dec 2009 Location: Henderson, NV Posts: 539	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
jeffcobb is offline

02-09-2010, 11:04 AM	#5
Dino Jack of many languages Join Date: Nov 2007 Location: Katy, Texas Posts: 2,071	Why not use Xcode tools? __________________ Mac and Windows cross platform programmer. Ruby lover.
Dino is offline

02-09-2010, 11:46 AM	#10
jeffcobb Registered User Join Date: Dec 2009 Location: Henderson, NV Posts: 539	Yeah but I know how to profile my code __________________ C/C++ Environment: GNU CC/Emacs Make system: CMake Debuggers: Valgrind/GDB
jeffcobb is offline

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