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From "Shane Witbeck" <sh...@digitalsanctum.com>
Subject Re: 20 Tips for Using Tomcat in Production
Date Tue, 21 Aug 2007 14:57:23 GMT
David,

Thanks for your comments. I've added them to the blog post for
everyone's benefit.

Shane

On 8/21/07, David Delbecq <delbd+jakarta@oma.be> wrote:
> Very nice. May i suggest 2 comments perhaps?:
>
> 6... If you're loading several applications with several of the same
> library dependencies, consider moving them from the applications'
> |WEB-INF/lib| directory to Tomcat's shared library
> |{catalina.home}/shared/lib|. This will reduce the memory used by each
> application and result in smaller WAR files.
>
> You should make a remark that this change the behaviour of webapp:
>  a) Shared classloader is searched in last ressort when looking for
> classes, according to
> http://tomcat.apache.org/tomcat-5.5-doc/class-loader-howto.html.
>  b) Because the classes are shared, they share config & singletons and
> if they store objects statically they will prevent webapp unloading
>
>
> 7...Consider JDK 1.5 or even better JDK 1.6 to take advantage of
> performance improvements.
>
> Note that you can gain even more performance if you recompile your
> "string concatenation hungry" (d="aaaa"+b+"ccc") support libaries for
> jdk 5+ on a multi CPU system. This is because jdk5 uses the
> non-synchronized stringbuilder instead of the jdk 4- synchronized
> StringBuffer. And synchronization over multiple cpu takes a few more
> cycles than on single CPU machines.
>
>
>
> En l'instant précis du 21/08/07 14:10, Shane Witbeck s'exprimait en ces
> termes:
> > I thought my latest blog post would be of interest to the people on this list:
> >
> > http://www.digitalsanctum.com/2007/08/18/20-tips-for-using-tomcat-in-production/
> >
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>
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-- 
Thank you,

Shane Witbeck
Digital Sanctum, inc.
-----------------------------------------------------
skype: digitalsanctum
  blog: http://www.digitalsanctum.com

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