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From: delbd <delbd@oma.be>
Organization: Institut Royal =?iso-8859-1?q?M=E9t=E9orologique?=
To: "Tomcat Users List" <tomcat-user@jakarta.apache.org>
Subject: Re: high cpu usage during xslt processing (resending)
Date: Thu, 9 Jun 2005 10:35:19 +0200
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Dunno for windows, but CPU usage for tomcat on linux is always 100% of=20
available CPU time when serving any kind of request. This is the case for a=
ny=20
application (tomcat or other) because this is the way process management is=
=20
done in the OS (any application get 100% CPU when requesting it if the=20
application is the only one to request CPU). Of course if i run 2=20
applications and ask them both do do calculations at the same time, they wi=
ll=20
each use 50% CPU (100% each if you have multiprocessor). If i change the=20
priority of one of those applications if might get something like 20% for o=
ne=20
and 80% for the other one.=20

So the question is not how much cpu time is used (if i use 100% that means =
it=20
uses all available cpu, which is good because it use everything it can to=20
server the request as fat as possible), but the question might rather be to=
=20
know if serving 15 xsl pages simultaneously on tomcat is significantly slow=
er =20
than serving the same 15 pages on jrun

Anyway if all you want is have tomcat not slow down other service you might=
=20
have, just lower it's process priority (using windows tools provided and i=
=20
don't know about)


Le Jeudi 9 Juin 2005 09:51, kamal r a =E9crit :
> (Resending as earlier mail had bounced)
> Recently we have migrated our application from
> jrun3.1 to tomcat 4.1.31 running on windows 2000
> advanced server. It uses saxon 6.5.3 for xslt
> processing and the cpu usage is almost 100% even for
> 15 concurrent users. So in order to do a simple load
> test on the xslt part alone, I wrote a test jsp and
> the cpu usage is almost 100% for 15 concurrent users
> for a xsl file 106kb in size.
> XSLTTest.jsp
> TransformerFactory factory =3D
> TransformerFactory.newInstance();
>     StreamSource source =3D new StreamSource(new
> FileInputStream("test.xsl"));
>     Templates pss =3D factory.newTemplates(source);
>     Transformer transformer =3D pss.newTransformer();
>     ByteArrayInputStream temp =3D new
> ByteArrayInputStream("<xml></xml>".getBytes());
>     source =3D new StreamSource(temp);
>     StreamResult result =3D new
> StreamResult(response.getOutputStream());
>     transformer.transform(source, result);
>
>   The cpu usage is at 60% for the same jsp page on the
>  jrun 3.1 server. Can anybody provide me with pointers
> to reduce cpu usage or has anyone who has faced a
> similar scenario.
>   Please let me know if I need to provide more inputs
> as this is my first mail to the list.
>
> Thanks
> Kamal
>
> Send instant messages to your online friends http://uk.messenger.yahoo.com
>
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=2D-=20
David Delbecq
Royal Meteorological Institute of Belgium

=2D
Is there life after /sbin/halt -p?

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