RE: [xml] 2.5.x performance vs. 2.4.24

["Grant Goodale" <grant reactivity com>]

        Excellent!  Thanks for the quick response.  Will 2.5.10 be out
soon?  I'll try out the cvs version in the meantime.

        G

-----Original Message-----
From: Daniel Veillard [mailto:veillard redhat com] 
Sent: Wednesday, August 13, 2003 5:42 PM
To: Grant Goodale
Cc: xml gnome org
Subject: Re: [xml] 2.5.x performance vs. 2.4.24


On Wed, Aug 13, 2003 at 11:44:08AM -0700, Grant Goodale wrote:
>       Sample document attached.  The command I've used for testing is:
>
>       xmllint --timing --noout --memory ./test.xml

  Seems I found a very nice way to waste CPU cycles:
    1/ take a large XML document in a memory buffer
    2/ consume a few bytes of it
    3/ repack the buffer moving all unused memory to the beginning
       of the buffer
    4/ repeat to 2/ until buffer empty
 of course the operation in 3 is a memmove especially ugly for the
cache. 2 lines patch fixed in CVS, while I was at it I avoid now
processing 
all UTF-8 intput though a void UTF-8 to UTF-8 converter.

   Sorry about that, it was quadratic but hard to detect for relatively
small documents, I assume this was introduced recently ! It happened
only when parsing from a memory buffer, which usually is not done for
large document.
   The 1 line patch is now in CVS, thanks for the report,

Daniel

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