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gprof on arm-linux "no accumulated time problem"

Hi,

Recently I am trying to use gprof to profile my application on the board, but encounter some problem with grof, currently I can get gmon.out file, but I use 'gprof a.out gmon.out > log', I find out that gprof only show how many times each function has been called, but missing most important factor, each function always occupy 0 cpu time, this is so strange.

My arm linux cross-compiler info:
gcc-4.1.2
libc-2.5
binutils 2.18

So what's the problem with gprof, anybody can help me, thanks!

Code:

#include <stdio.h>



void func()

{

    int i = 0;

    int j = 0;

    while(i < 10000000){

        i++;

        j += i;

    }

    return;

}



int main()

{

    func();

    return 0;

}

gprof result

Code:

Flat profile:



Each sample counts as 0.01 seconds.

 no time accumulated



  %  cumulative  self              self    total

 time  seconds  seconds    calls  Ts/call  Ts/call  name

  0.00      0.00    0.00        1    0.00    0.00  func



...............

Insert one more 0 in the loop and check. For me the code works fine, maybe the resolution is too low for your machine?

I have tried, nothing happens, thanks!

Quote:

Originally Posted by Mara (Post 3260640)

Insert one more 0 in the loop and check. For me the code works fine, maybe the resolution is too low for your machine?