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From Torsten Curdt <tcu...@dff.st>
Subject Re: Who needs 386% speed up?
Date Mon, 28 Jan 2002 07:58:18 GMT
On Sun, 27 Jan 2002, Vadim Gritsenko wrote:

> Hi,
>
> While playing with OptimizeIt, I found quite interesting piece of code
> in Xalan code, class org.apache.xml.utils.DefaultErrorHandler:
>
>   public DefaultErrorHandler()
>   {
>     m_pw = new PrintWriter(System.err, true);
>   }

So it's the creation of that PrintWriter that takes so long?

> Which, according to OptimizeIt, takes 42.72% of time on the simple
> pipeline with XSP generator and XML serializer (modified /cocoon/sub/xsp
> sample, without transformation). This was hard to believe, so I got
> Xalan CVS and quickly hacked this class (diff attached). The results are
> astonishing: also I did not get much improvement in throughput (too much
> time was taken by the sockets; may be more testing threads will help),
> but processing time improved on 386%, from 498 ms to 129 ms.
>
> I though somebody might be interested in this result, so here is the
> letter :)

Definitly ;)

> PS If somebody could ask Xalan guys to get rid of new PrintWriter() -
> this would be great :)

Did post a message on Xalan Dev?


> PPS XSPs *are* fast. XSL is slow :-|

...but people say XSPs are not skaling very good. AFAIR (vaguely) Berin
tracked this down (also with optimizeIt) and it was a classloader issue.
Berin, is this right? Please correct me if I am wrong... I guess this
raised the monitoring thread...

(Sorry didn't find the correct message in the archives)
--
Torsten


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