Howdy,

>We are not using runtime-controllable logging at this time.  It seems
that
>log4j is the de facto standard, so I suppose that's what I'll try
first.  >How does the JDK 1.4 logging facility compare to log4j?

There have been extensive discussions on this issue on the log4j-user
mailing list.  That archive will answer your question.  See here for a
starting point:
http://nagoya.apache.org/wiki/apachewiki.cgi?Log4JProjectPages/Log4jvsJD
KLogging

>Have you used any of the profilers designed for production use like
>RootCause or jvmstat?  I'm strongly interested in trying one of them
out.

I've used jvmstat and like it.  But I don't profile much in production,
only in dev/test, and on those environments I use OptimizeIt.

>JRockit does not produce an hs_err file that I can see.  It does do a
dump
>to catalina.out, which doesn't contain anything obviously useful to me.
It
>does output 'registers', 'stack', 'code' and 'loaded modules'.  All are
in >hex except the loaded modules.

Well, that doesn't help too much ;(

>I'm open to suggestions.  We were pretty much a Windows shop until
about 6

I would try the latest stable linux kernel.  Wasn't there a threading
library change a couple of kernel versions ago that several people
complained screwed up their JVMs?

>difference.  Any other operating systems you would recommend?

Things have been working very well for us on Solaris (8).  But there's
no reason you couldn't make it happen on linux.

>of that.  We also used SingleThreadModel extensively which of course
Tomcat
>doesn't
>really support.

What do you mean, tomcat doesn't really support? ;)  Tomcat implements
the servlet spec exactly with respect to SingleThreadModel.

Yoav Shapira



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