------- 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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