From: Dmitry Antipov <dmantipov@yandex.ru>
To: emacs-devel@gnu.org
Cc: Alan Mackenzie <acm@muc.de>, Eli Zaretskii <eliz@gnu.org>,
Stefan Monnier <monnier@iro.umontreal.ca>
Subject: Re: Scrolling huge buffers and cc-mode
Date: Wed, 19 Dec 2012 10:04:41 +0400 [thread overview]
Message-ID: <50D158F9.2070303@yandex.ru> (raw)
In-Reply-To: <jwvk3sfxhe3.fsf-monnier+emacs@gnu.org>
On 12/18/2012 11:58 PM, Stefan Monnier wrote:
>> about 1 minute is below. If I understand correctly, it blames
>> scan-sexps for most of the CPU load.
>
> Indeed, but running scan-sexps on the whole buffer doesn't take that
> long, so the problem is not that scan-sexps is slow, but that it's
> called too many times.
I didn't try to profile elisp, but here is what I'm seeing at the lower level.
Since the percentage of exec_byte_code is just 1.21%, I suspect that elisp
is not a bottleneck here. Looking at enormous percentage of lookup_char_property
and next_interval, I would rather suspect an issue with interval trees.
Dmitry
# ========
# captured on: Tue Dec 18 19:30:31 2012
# hostname : localhost.localdomain
# os release : 3.6.10-2.fc17.x86_64
# perf version : 3.6.10-2.fc17.x86_64
# arch : x86_64
# nrcpus online : 4
# nrcpus avail : 4
# cpudesc : Intel(R) Core(TM) i5-2410M CPU @ 2.30GHz
# cpuid : GenuineIntel,6,42,7
# total memory : 3930292 kB
# cmdline : /usr/bin/perf record -e stalled-cycles-frontend -e stalled-cycles-backend -F 10000 ./src/emacs -Q ../../misc/huge.cc
# event : name = stalled-cycles-frontend, type = 0, config = 0x7, config1 = 0x0, config2 = 0x0, excl_usr = 0, excl_kern = 0, excl_host
# event : name = stalled-cycles-backend, type = 0, config = 0x8, config1 = 0x0, config2 = 0x0, excl_usr = 0, excl_kern = 0, excl_host
# HEADER_CPU_TOPOLOGY info available, use -I to display
# HEADER_NUMA_TOPOLOGY info available, use -I to display
# ========
#
# Samples: 3M of event 'stalled-cycles-frontend'
# Event count (approx.): 284964331659
#
# Overhead Command Shared Object Symbol
# ........ ........... ............................. ......................................................
#
22.65% emacs emacs [.] lookup_char_property
21.21% emacs emacs [.] scan_sexps_forward
17.65% emacs emacs [.] next_interval
8.29% emacs emacs [.] Fcdr
4.66% emacs emacs [.] update_syntax_table
2.15% emacs emacs [.] scan_lists
1.95% emacs emacs [.] mark_object
1.92% emacs emacs [.] update_interval
1.74% emacs emacs [.] Fassq
1.41% emacs emacs [.] back_comment
1.38% emacs emacs [.] forw_comment
1.21% emacs emacs [.] exec_byte_code
1.08% emacs emacs [.] char_quoted
1.05% emacs emacs [.] re_match_2_internal
0.70% emacs emacs [.] re_compile_pattern
0.67% emacs emacs [.] Fgarbage_collect
0.58% emacs emacs [.] find_interval
next prev parent reply other threads:[~2012-12-19 6:04 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-18 9:56 Scrolling huge buffers and cc-mode Dmitry Antipov
2012-12-18 17:30 ` Eli Zaretskii
2012-12-18 19:58 ` Stefan Monnier
2012-12-19 6:04 ` Dmitry Antipov [this message]
2012-12-19 7:20 ` Dmitry Antipov
2012-12-19 22:39 ` Alan Mackenzie
2012-12-20 0:52 ` Michael Welsh Duggan
2012-12-20 22:29 ` Alan Mackenzie
2012-12-21 5:15 ` Dmitry Antipov
2012-12-21 10:57 ` Alan Mackenzie
2012-12-22 3:28 ` Chong Yidong
2012-12-18 19:40 ` Stefan Monnier
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