From: YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 16039@debbugs.gnu.org, emacs user <user.emacs@gmail.com>
Subject: bug#16039: repeated emacs crashes (in GC?)
Date: Thu, 05 Dec 2013 09:35:21 +0900 [thread overview]
Message-ID: <wl61r4kud2.wl%mituharu@math.s.chiba-u.ac.jp> (raw)
In-Reply-To: <wltxepfktg.wl%mituharu@math.s.chiba-u.ac.jp>
>>>>> 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
next prev parent reply other threads:[~2013-12-05 0:35 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-03 14:55 bug#16039: repeated emacs crashes (in GC?) emacs user
2013-12-03 16:01 ` Eli Zaretskii
2013-12-04 0:43 ` YAMAMOTO Mitsuharu
2013-12-04 1:48 ` YAMAMOTO Mitsuharu
2013-12-05 0:35 ` YAMAMOTO Mitsuharu [this message]
2013-12-05 6:54 ` emacs user
2013-12-04 3:49 ` Eli Zaretskii
2013-12-04 6:33 ` emacs user
2013-12-07 20:29 ` emacs user
2013-12-15 17:17 ` emacs user
2013-12-15 17:45 ` Eli Zaretskii
2014-01-18 16:06 ` emacs user
2016-05-28 15:08 ` Alan Third
2016-11-03 22:45 ` emacs user
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