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bug#16039: repeated emacs crashes (in GC?)


From: YAMAMOTO Mitsuharu
Subject: bug#16039: repeated emacs crashes (in GC?)
Date: Thu, 05 Dec 2013 09:35:21 +0900
User-agent: Wanderlust/2.14.0 (Africa) SEMI/1.14.6 (Maruoka) FLIM/1.14.8 (Shijō) APEL/10.6 Emacs/22.3 (sparc-sun-solaris2.8) MULE/5.0 (SAKAKI)

>>>>> On Wed, 04 Dec 2013 10:48:11 +0900, YAMAMOTO Mitsuharu 
>>>>> <mituharu@math.s.chiba-u.ac.jp> said:

>>> Having 136 thousand frames during GC is not unheard of.

>> (/ 8720000.0 (* 136 1000))
>> 64.11764705882354

>> If each frame consumes more than 64 bytes, then it will use up
>> 8720000B stack space.

> FWIW, the default compiler for Xcode 4.0.2 on Mac OS X 10.6 with the
> -O2 option seems to consume 64 bytes for each mark_object frame:

>   i686-apple-darwin10-gcc-4.2.1 (GCC) 4.2.1 (Apple Inc. build 5666) (dot 3)

>   _mark_object:
>   00000000000008a0    pushq   %rbp
>   00000000000008a1    movq    %rsp, %rbp
>   00000000000008a4    movq    %rbx, 0xffffffffffffffd8(%rbp)
>   00000000000008a8    movq    %r12, 0xffffffffffffffe0(%rbp)
>   00000000000008ac    movq    %r13, 0xffffffffffffffe8(%rbp)
>   00000000000008b0    movq    %r14, 0xfffffffffffffff0(%rbp)
>   00000000000008b4    movq    %r15, 0xfffffffffffffff8(%rbp)
>   00000000000008b8    subq    $0x40, %rsp

> And the one for Xcode 5.0.2 on OS X 10.9 with -O4 does 24 bytes:

>   Apple LLVM version 5.0 (clang-500.2.79) (based on LLVM 3.3svn)

>   _mark_object:
>   0000000000005c70    pushq   %rbp
>   0000000000005c71    movq    %rsp, %rbp
>   0000000000005c74    pushq   %r15
>   0000000000005c76    pushq   %r14
>   0000000000005c78    pushq   %r13
>   0000000000005c7a    pushq   %r12
>   0000000000005c7c    pushq   %rbx
>   0000000000005c7d    subq    $0x18, %rsp

I forgot to count the pushq instructions.  The correct value would be
72 bytes for each mark_object frame in both cases.

                                     YAMAMOTO Mitsuharu
                                mituharu@math.s.chiba-u.ac.jp





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