> From: Yue Yuanyuan [mailto:yue.yuany...@gmail.com] 
> Subject: About the virtual host

> After I edited the server.xml to add one virtual
> host, it becomes extremely slow.

Your heap settings may be marginal - but you didn't tell us what they are, nor 
even what JVM version you're running with.  (If it's gcj, throw it out and 
install a real JVM.)  There's at least one site with hundreds of <Host> entries 
in a single Tomcat without a problem, so just declaring a second one is not the 
real issue.

How do you determine slowness?  Is CPU usage high?  What's in the logs?  What 
does GC logging show?

> And it got out of memory exceptions after I deployed 
> one project (20M size) on the the new virtual host.

Another possible indication that your heap is undersized - or that you've got a 
really broken webapp.  Note that size on disk is irrelevant with respect to 
heap usage.

> Is that possible two virtual host to use different 
> memory space?

No, they're part of the same JVM.

> Or how could I have two tomcat instances running on 
> the same server?

You could do that, but you should really fix the problem, not attack the 
symptom.

 - Chuck


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