[Bug gprof/2335] gprof reads executable 10x slower on opteron/x86_64

[dirkjan at magma-da dot com]

------- Additional Comments From dirkjan at magma-da dot com  2006-04-07 06:24 
-------
Subject: Re:  gprof reads executable 10x slower on opteron/x86_64

Note that the real problem is not stabs or not. But 10x slowdown on 
opteron64 bit when gprof reads the executable. Adding -gstab1 then 
solves the problem. Also I noticed the resolves in gprof are done via a 
function with stabs and not the one with dwarf.

using a gcc4.0.2 compiler and binutils 2.16.1 on linux72:

main.cxx:
#include "iostream.h"

int main(){
         cout<<"Hello world";
}

g++ main.cxx
objdump a.out

....
Sections:
Idx Name          Size      VMA       LMA       File off  Algn
   0 .interp       00000013  08048114  08048114  00000114  2**0
                   CONTENTS, ALLOC, LOAD, READONLY, DATA
   1 .note.ABI-tag 00000020  08048128  08048128  00000128  2**2
                   CONTENTS, ALLOC, LOAD, READONLY, DATA
   2 .hash         00000048  08048148  08048148  00000148  2**2
                   CONTENTS, ALLOC, LOAD, READONLY, DATA
   3 .dynsym       000000d0  08048190  08048190  00000190  2**2
                   CONTENTS, ALLOC, LOAD, READONLY, DATA
   4 .dynstr       0000016d  08048260  08048260  00000260  2**0
                   CONTENTS, ALLOC, LOAD, READONLY, DATA
   5 .gnu.version  0000001a  080483ce  080483ce  000003ce  2**1
                   CONTENTS, ALLOC, LOAD, READONLY, DATA
   6 .gnu.version_r 00000070  080483e8  080483e8  000003e8  2**2
                   CONTENTS, ALLOC, LOAD, READONLY, DATA
   7 .rel.dyn      00000010  08048458  08048458  00000458  2**2
                   CONTENTS, ALLOC, LOAD, READONLY, DATA
   8 .rel.plt      00000038  08048468  08048468  00000468  2**2
                   CONTENTS, ALLOC, LOAD, READONLY, DATA
   9 .init         00000018  080484a0  080484a0  000004a0  2**2
                   CONTENTS, ALLOC, LOAD, READONLY, CODE
  10 .plt          00000080  080484b8  080484b8  000004b8  2**2
                   CONTENTS, ALLOC, LOAD, READONLY, CODE
  11 .text         000001e4  08048540  08048540  00000540  2**4
                   CONTENTS, ALLOC, LOAD, READONLY, CODE
  12 .fini         0000001e  08048724  08048724  00000724  2**2
                   CONTENTS, ALLOC, LOAD, READONLY, CODE
  13 .rodata       00000014  08048744  08048744  00000744  2**2
                   CONTENTS, ALLOC, LOAD, READONLY, DATA
  14 .eh_frame     000000b0  08048758  08048758  00000758  2**2
                   CONTENTS, ALLOC, LOAD, READONLY, DATA
  15 .ctors        0000000c  08049808  08049808  00000808  2**2
                   CONTENTS, ALLOC, LOAD, DATA
  16 .dtors        0000000c  08049814  08049814  00000814  2**2
                   CONTENTS, ALLOC, LOAD, DATA
  17 .jcr          00000004  08049820  08049820  00000820  2**2
                   CONTENTS, ALLOC, LOAD, DATA
  18 .dynamic      000000e0  08049824  08049824  00000824  2**2
                   CONTENTS, ALLOC, LOAD, DATA
  19 .got          00000004  08049904  08049904  00000904  2**2
                   CONTENTS, ALLOC, LOAD, DATA
  20 .got.plt      00000028  08049908  08049908  00000908  2**2
                   CONTENTS, ALLOC, LOAD, DATA
  21 .data         0000000c  08049930  08049930  00000930  2**2
                   CONTENTS, ALLOC, LOAD, DATA
  22 .bss          000000b0  0804993c  0804993c  0000093c  2**3
                   ALLOC
  23 .stab         000007a4  00000000  00000000  0000093c  2**2
                   CONTENTS, READONLY, DEBUGGING
  24 .stabstr      00001985  00000000  00000000  000010e0  2**0
                   CONTENTS, READONLY, DEBUGGING
  25 .comment      000000e7  00000000  00000000  00002a65  2**0
                   CONTENTS, READONLY
  26 .note         0000003c  00000000  00000000  00002b4c  2**0
                   CONTENTS, READONLY


Dirk-Jan


bje at sources dot redhat dot com wrote:
> ------- Additional Comments From bje at sources dot redhat dot com  
> 2006-04-07 00:36 -------
> You should not be seeing a .stabs section in an x86 Linux binary, either.
> Can you please attach some example binaries to this bug report?
> 

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------- Additional Comments From dirkjan at magma-da dot com  2006-04-07 06:24 
-------
Created an attachment (id=958)
 --> (http://sourceware.org/bugzilla/attachment.cgi?id=958&action=view)


-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=2335

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