On Thu, 2008-02-14 at 17:38 +0100, Michal Novotny wrote:
> Hi,
>
> I was looking at performance of FireFox3 startup using callgrind and
> found a lot of calls to realloc() from FcCharSetPutLeaf(). During the
> startup there are 10 calls to FcFontSort() that lead to 105242 calls to
> FcCharSetPutLeaf() and 209842 calls to realloc(). I tried to
> allocate/reallocate memory in bigger blocks and calls to realloc() were
> reduced to 25982 when block size was 8 (patch is attached). Of course
> some memory is wasted with this approach but number of instructions
> needed to do FcFontSort() decreased from 176569552 to 125762052. Is it
> possible to have similar optimalization in next releases of fontconfig?
Yeah, this is consistent with my observations. I wanted to look into it but you beat me to it. For the record, doing a Pango "hello world" using the following command:
pango-view --text "hello world"
produces the following memory statistics (using my malloc-stats tool available in cairo/util):
TOTAL MALLOC REALLOC
num size num size num size
[...]
10 160 10 160 0 0 *INT_cairo_font_options_create()
10 960 10 960 0 0 _cairo_hash_table_create()
10 24,971 10 24,971 0 0 XOpenDisplay()
12 1,716 12 1,716 0 0 _nl_intern_locale_data()
12 4,224 12 4,224 0 0 __fopen_internal()
15 205 15 205 0 0 strdup()
16 250 16 250 0 0 __nss_database_lookup()
16 1,472 16 1,472 0 0 _cairo_scaled_glyph_lookup()
19 730 19 730 0 0 nss_parse_service_list()
22 17,024 4 512 18 16,512 FcFontSetAdd()
27 864 27 864 0 0 _XlcSetConverter()
27 5,756 27 5,756 0 0 _XkbReadGetMapReply()
31 748 18 560 13 188 _XlcParse_scopemaps()
32 1,372 32 1,372 0 0 _nl_make_l10nflist()
34 12,904 34 12,904 0 0 xcb_send_request()
35 1,332 35 1,332 0 0 FcConfigHome()
41 1,120 41 1,120 0 0 FcNameRegisterConstants()
51 1,700 51 1,700 0 0 FcCacheCopySet()
52 416 52 416 0 0 FcStrListCreate()
52 416 52 416 0 0 _XlcAddCharSet()
53 1,660 53 1,660 0 0 _XlcAddCT()
54 3,891 46 3,371 8 520 vasprintf()
57 1,697 57 1,697 0 0 FcStrSetAdd()
60 4,047 60 4,047 0 0 FcStrPlus()
66 68,112 66 68,112 0 0 XML_GetParsingStatus()
122 10,208 122 10,208 0 0 FcStrSetDel()
132 2,112 132 2,112 0 0 FcCharSetCreate()
134 3,752 134 3,752 0 0 FcLangSetCreate()
136 4,352 136 4,352 0 0 FcConfigSubstituteWithPat()
144 78,722 125 72,738 19 5,984 FT_New_Memory()
155 4,241 155 4,241 0 0 _XlcCreateDefaultCharSet()
268 10,720 268 10,720 0 0 XML_ParserCreate()
271 4,336 271 4,336 0 0 cairo_font_options_copy()
277 33,810 277 33,810 0 0 IA__g_malloc0()
290 3,669 276 3,194 14 475 _XlcDestroyLocaleDataBase()
290 54,528 154 19,712 136 34,816 FcPatternHash()
336 5,057 336 5,057 0 0 FcConfigFilename()
347 5,581 346 5,533 1 48 XrmGetResource()
477 12,773 477 12,773 0 0 FcPatternCreate()
593 849,534 593 849,534 0 0 XML_GetBuffer()
637 9,754 637 9,754 0 0 FcStrCopy()
647 199,620 0 0 647 199,620 IA__g_realloc()
729 8,338 729 8,338 0 0 FcStrSetCreate()
1001 68,832 1001 68,832 0 0 IA__g_malloc()
2599 1,695,090 2599 1,695,090 0 0 _hb_alloc()
3766 75,320 3766 75,320 0 0 FcValueSave()
6512 194,132 6498 191,572 14 2,560 FcStrSetAddFilename()
124902 50,686,656 41898 1,333,080 83004 49,353,576 FcCharSetNew()
145776 54,395,761 61893 4,776,114 83883 49,619,647 (total)
As can be seen, fontconfig is responsible for most of the malloc and
realloc calls! I may look into this later, but for now, fixing the
realloc problem you identified is the biggest step.
> Michal
--
behdad
http://behdad.org/
"Those who would give up Essential Liberty to purchase a little
Temporary Safety, deserve neither Liberty nor Safety."
-- Benjamin Franklin, 1759
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