Re: [xml] xmlCopyNode ultra slow

[Kasimier Buchcik <K Buchcik 4commerce de>]

Hi,

On Sat, 2005-12-31 at 09:48 -0500, Daniel Veillard wrote:
> On Tue, Dec 27, 2005 at 12:25:37PM +0100, Rikardo Tinauer wrote:
> > Hello,
> > 
> > we use libxml2 and xpath. When filling DOM structure we use predefined xml 
> > nodes. When using "xmlCopyNode" it sometimes needs more than 0.2 seconds to 
> > add one node.
> 
>   Sounds broken, there is something else killing your performances !
> 
> > Is there anything we can do to speed this up? Is there any progress made on 
> > XPATH performance? We need it badly!
> 
>   it's an open source project, do the analysis explaining where the
> performance problem is and it may get fixed.

Ricardo, can you provide some examples for the XPath expressions which
constitute a bottleneck for you? Some of the most simple expressions are
processed via the pattern.c module, resulting in a big performance
boost. It would be interesting to know what is dearly needed to be
optimized in the future.

Regards,

Kasimier