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bug#15876: 24.3.50; Highly degraded performance between rev 114715 and 1
From: |
Dmitry Antipov |
Subject: |
bug#15876: 24.3.50; Highly degraded performance between rev 114715 and 115006 |
Date: |
Thu, 05 Dec 2013 10:29:45 +0400 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.1.1 |
On 12/04/2013 09:53 PM, Eli Zaretskii wrote:
> What kind of information do I need to collect on Windows to make it
> clear where the problem is? Can you suggest some code that would
> collect the necessary information, or ideas for writing such code?
> (It's inconvenient to collect the data in GDB, since many objects are
> marked at this point, and printing them from GDB crashes Emacs.)
OK, let's try the following steps.
1. Apply attached patch and rebuild.
2. Run emacs -Q, then M-x insert-char 25b7 and M-x describe-char.
Now you should know the C pointer to font object which is used
to display right-pointing triangle (underlined red on screenshot).
3. Insert GDB breakpoints to fprintf, move cursor, do some basic editing
around the triangle and run M-x garbage-collect few times. An
interesting font object should be either marked or swept; if it's
markerd, you should hit the breakpoint "GCX: mark interesting font Y".
For my --without-xft build, M-x garbage-collect always shows that an
interesting font object is marked in expected way - via face cache. E.g.:
(gdb) bt 8
#0 __fprintf (stream=0x3869dbb1e0 <_IO_2_1_stderr_>, format=0x6cf620 "GC%ld: mark
interesting font %p\n") at fprintf.c:27
#1 0x00000000005c7269 in mark_vectorlike (ptr=0xd7c8b8) at
../../trunk/src/alloc.c:5745
#2 0x00000000005c75a4 in mark_face_cache (c=0x11456b0) at
../../trunk/src/alloc.c:5838
#3 0x00000000005c7b43 in mark_object (arg=...) at ../../trunk/src/alloc.c:6014
#4 0x00000000005c7288 in mark_vectorlike (ptr=0x127d4f8) at
../../trunk/src/alloc.c:5754
#5 0x00000000005c7baa in mark_object (arg=...) at ../../trunk/src/alloc.c:6031
#6 0x00000000005c7288 in mark_vectorlike (ptr=0xcf3230) at
../../trunk/src/alloc.c:5754
#7 0x00000000005c7457 in mark_buffer (buffer=0xcf3230) at
../../trunk/src/alloc.c:5805
(More stack frames follow...)
Dmitry
font-pointer.png
Description: PNG image
font_debug_bug15876.patch
Description: Text Data
- bug#15876: 24.3.50; Highly degraded performance between rev 114715 and 115006, Eli Zaretskii, 2013/12/01
- bug#15876: 24.3.50; Highly degraded performance between rev 114715 and 115006, Dmitry Antipov, 2013/12/02
- bug#15876: 24.3.50; Highly degraded performance between rev 114715 and 115006, Dmitry Antipov, 2013/12/02
- bug#15876: 24.3.50; Highly degraded performance between rev 114715 and 115006, Eli Zaretskii, 2013/12/02
- bug#15876: 24.3.50; Highly degraded performance between rev 114715 and 115006, Dmitry Antipov, 2013/12/03
- bug#15876: 24.3.50; Highly degraded performance between rev 114715 and 115006, Eli Zaretskii, 2013/12/03
- bug#15876: 24.3.50; Highly degraded performance between rev 114715 and 115006, Dmitry Antipov, 2013/12/03
- bug#15876: 24.3.50; Highly degraded performance between rev 114715 and 115006, Eli Zaretskii, 2013/12/04
- bug#15876: 24.3.50; Highly degraded performance between rev 114715 and 115006,
Dmitry Antipov <=
- bug#15876: 24.3.50; Highly degraded performance between rev 114715 and 115006, Eli Zaretskii, 2013/12/05
- bug#15876: 24.3.50; Highly degraded performance between rev 114715 and 115006, Dmitry Antipov, 2013/12/11
- bug#15876: [SPAM] bug#15876: 24.3.50; Highly degraded performance between rev 114715 and 115006, Jarek Czekalski, 2013/12/11
- bug#15876: 24.3.50; Highly degraded performance between rev 114715 and 115006, Dmitry Antipov, 2013/12/11
- bug#15876: 24.3.50; Highly degraded performance between rev 114715 and 115006, Eli Zaretskii, 2013/12/11
- bug#15876: 24.3.50; Highly degraded performance between rev 114715 and 115006, Dmitry Antipov, 2013/12/11
- bug#15876: 24.3.50; Highly degraded performance between rev 114715 and 115006, Eli Zaretskii, 2013/12/11
- bug#15876: 24.3.50; Highly degraded performance between rev 114715 and 115006, Jan Djärv, 2013/12/11
- bug#15876: 24.3.50; Highly degraded performance between rev 114715 and 115006, Eli Zaretskii, 2013/12/13
- bug#15876: 24.3.50; Highly degraded performance between rev 114715 and 115006, Dmitry Antipov, 2013/12/13