[xml] Thread safety

[Jerome Pesenti <jpesenti yahoo com>]

Turning on thread safety in libxml seems to have a big
perfomance cost when doing XSL transformations.

Here is a typical example:

22ms Using libxml 20507 (--without-threads), libxslt
10030 and libexslt 719
37ms Using libxml 20507 (--with-threads, libxslt 10030
and libexslt 719
30ms Using libxml 20430, libxslt 10024 and libexslt
715

That is a 70% increase in running time (note the nice
30% improvement between 2.4.30/1.2.4 and 2.5.7/1.3.0)
which I can consistenly reproduce with different
XML/XSL.

Is there any way to go around this?

Other question: is --with-threads required for 
thread safety when running different transformations
with different XML and XSL and the same global
options?

Thanks for all the good work!
Regards,
Jerome




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