On 25/03/2010 16:05, George Sexton wrote:
> I have a question about how Tomcat 5.5 starts up. I'm looking through the
> source code of 5.5.28 trying to follow it and I'd appreciate it if someone
> could clarify a point or two for me.
>
> From reading the server.xml, the hierarchy of containers in Tomcat is:
>
> Server
> Service
> Engine
> Host
>
> I'm not using contexts declared in the server.xml so I'm omitting them.
>
> Looking through the source code, the classes seem to be defined in the same
> hierarchy. There's StandardServer, StandardService, StandardEngine,
> StandardHost.
>
> It looks like StandardEngine.start() invokes ContainerBase.start() which I'm
> guessing starts each one of the hosts using this loop:
>
> Container children[] = findChildren();
> for (int i = 0; i < children.length; i++) {
> if (children[i] instanceof Lifecycle)
> ((Lifecycle) children[i]).start();
> }
>
> Is this interpretation correct?
Correct.
> My server.xml has over 300 hosts defined and startup time is getting pretty
> big. There doesn't seem to be a difference in startup time between a quad
> core server and a single core server. It appears to me this is because
> startup of the hosts is sequential. In the best of all possible worlds it
> would be nice if 4 cores means 4x faster startup.
Start-up is currently single threaded. Patches welcome...
Mark
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