Steve,
Multiple VMs are useful when you have different applicaitons you'd like to
separate from each other. A typical example is an ISP. The ones that do
servlet hosting tend to give each client their own VM. This is more
resource-intensive, but allows each client to start and stop their VM
independently without affecting the other clients. Also, if one client is
testing code and has a bug (say, an infinite loop), it won't affect the
others. This translates well to internal environemnts, as well. You can one
servlet runner/app server and a different VM for each group's application.
(Where I am now, each group has its own servlet engine process and VM, all
running under a single WebSphere installation).
Out-of-process servlet runners are theoretically slower because the web
server has to talk to the servlet runner through an external protocol.
In-process servlet runners are generally faster because there is no extra
step -- the request is forwarded to the servlet runner in the same process.
Extensions that run in-process, however, can have a greater effect on the
web server (so, if the VM crashes, so does your web server).
Kito D. Mann
Virtua Communications Corp.
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Monday April 17, 2000 03:49 PM
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Subject: Mulitple VMs
How does one determine how many VMs to use with a servlet runner?
Is there any papers that describe the different scenarios?
For example, when using ServletExec I could run IN PROCESSS with one VM ,
or OUT
OF PROCESS with multiple VMs.
Which should I use?
How do I know when I need the mulitple VM capability within a servlet
runner?
How are the multiple VMs typically used?
- steveb
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