Re: help-using gnu's gprof for getting profiling information

[Rakesh M. Patel]

Hey,

   Thanks for your response....

   But i am still facing problems while using the sequence you have described 
in your mail. Also i make sure that i am using gcc 2.95 version.

   But i want to let you know that i am using fsf's gnu on windows 
platform...so does this make difference because in this case i can't implement
 
   $ perl /usr/share/doc/binutils/gprof/bbconv.pl <bb.out >BB-DATA

command. So is there any other way to do the same thing. Because i tried the 
same program you have attached in the reply to my previous question but the 
ouput i am getting after implementing following sequece of commands 

   c:\> gcc -o test_prog test_prog.c -g -pg -a
   c:\> rm bb.out
   c:\> test_prog
   c:\> gprof -A -l test_prog gmon.out BB-DATA

is:


   int increment(int x)
         1 -> {
                        int y = 0;
                        int i = 0;
                        for(i = 0; i < 100; i++)
                              x=x+1;
                         return x;
               }


So can you help me to solve this problem....

Waiting for your reply

Rakesh Patel

----- Original Message -----
From: Stepan Kasal <address@hidden>
Date: Thursday, April 1, 2004 2:51 am
Subject: Re: help-using gnu's gprof for getting profiling information

> Hello,
> 
> On Tue, Mar 30, 2004 at 08:11:00PM -0600, Rakesh M. Patel wrote:
> >   I am using gnu's gprof ...
> 
> OK, I tried it with a source file similar to your one:
> 
> $ cat test_prog.c
> int increment(int x)
> {
>        int y = 0;
>        int i = 0;
>        for(i = 0; i < 100; i++)
>                x=x+1;
>        return x;
> }
> main() {
>        int d;
>        increment(d);
> }
> 
> Then I run these commands:
> 
> $ gcc-2.95 -o test_prog test_prog.c -g -pg -a
> $ rm bb.out; ./test_prog
> $ perl /usr/share/doc/binutils/gprof/bbconv.pl <bb.out >BB-DATA
> $ gprof -A -l test_prog gmon.out BB-DATA
> 
> And the output was as expected:
> 
> *** File /home/kasal/test_prog.c:
>                int increment(int x)
>         1,1 -> {
>                        int y = 0;
>                        int i = 0;
>       101,1 ->         for(i = 0; i < 100; i++)
>         100 ->                 x=x+1;
>           1 ->         return x;
>           1 -> }
> 
> There are several pitfalls though:
> 1) It seems that new versions of gcc (3.2.3, 3.3, at least) don't
>   support -a.
> 2) OTOH, when the gcc is too old, like mine gcc-2.95.4, it outputs
>   the basic-block details into separate file bb.out; you have to 
> transform   it by bbconv.pl, as described in the gprof manual.
> 3) You have to remove the old copy of bb.out before running the 
> test program;
>   the results cumulate otherwise.
> 4) It might be better to use gprof without `-x', the output shows 
> mor clearly
>   which lines are ``merged together''. 
> 
> You might avoid the bb.out hassle by using a suitable version of 
> compiler,perhaps gcc 3.0.x.  I haven't tried this.
> 
> Hope this helps,
>       Stepan Kasal
>