Re: Fixed point cairo.. or no cairo?

[Michael Meeks <michael meeks novell com>]

On Tue, 2006-08-08 at 09:55 +0100, Matthew Allum wrote:
> On Tue, 2006-08-08 at 09:06 +0100, Michael Meeks wrote:
> > 	Did someone post a clear profile ( painting the problem sideways-on ;-)
> > before optimising, a link to that appreciated,
> 
> oprofile on ARM ( pxa250 ) stats focus on text rendering comparing GTK
> 2.6 to 2.8; http://www.o-hand.com/~jorn/pango-benchmarks/

	Ah - interesting; so poking at:

http://www.o-hand.com/~jorn/pango-benchmarks/28/full-report.txt

	I see a ton of vmlinux stuff apparently emulating the FPU - but,
unfortunately, it doesn't appear to tell me where those calls came from
(?) is there a pretty picture that shows that ? [ something like
'sysprof' output would do that I guess ].

	Also - I notice my old friend:

  1         0.0679  ld-2.3.90.so             ld-2.3.90.so             _dl_relocate_object
  1         0.0679  ld-2.3.90.so             ld-2.3.90.so             _dl_fixup
  1470     99.8641  ld-2.3.90.so             ld-2.3.90.so             _dl_lookup_symbol_x
1236      0.5132  ld-2.3.90.so             ld-2.3.90.so             do_lookup_x
  1236     83.9674  ld-2.3.90.so             ld-2.3.90.so             do_lookup_x [self]
  197      13.3832  ld-2.3.90.so             ld-2.3.90.so             strcmp
  39        2.6495  ld-2.3.90.so             ld-2.3.90.so             _dl_name_match_p

	A small but useful part of my research in this area just got merged
up-stream ( to binutils / glibc ) implementing a new, far more efficient
hash for symbol lookup[1]. The punch line is if you care enough, you
should back-port the glibc & binutils patch, and use
-Wl,--hash-style=both or --hash-style=gnu if you want to re-do your ABI
to save some space :-)

	HTH,

		Michael.

[1] - http://sourceware.org/ml/binutils/2006-07/msg00052.html - a ton of
development discussion.
-- 
 michael meeks novell com  <><, Pseudo Engineer, itinerant idiot