GNU bug report logs - #16039
repeated emacs crashes (in GC?)

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Message #26 received at 16039 <at> debbugs.gnu.org (full text, mbox):

From: emacs user <user.emacs <at> gmail.com>
To: YAMAMOTO Mitsuharu <mituharu <at> math.s.chiba-u.ac.jp>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 16039 <at> debbugs.gnu.org
Subject: Re: bug#16039: repeated emacs crashes (in GC?)
Date: Thu, 5 Dec 2013 08:54:13 +0200

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I managed to compile your mac port and inserted:

      newlim = (re_max_failures * ratio + 200000)*2;

will let you know in a few days if I still see crashes.


On Thu, Dec 5, 2013 at 2:35 AM, YAMAMOTO Mitsuharu <
mituharu <at> math.s.chiba-u.ac.jp> wrote:

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

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