Clustering on a single box.

Question

Is there typically a performance benefit from clustering EJBs on single box?
          That is, running a number of smaller (memory footprint) Weblogic Servers on
          a single machine vs. one larger instance. In its simplest form, we have an
          application where stateless session beans are used to perform transactions
          on behalf of the client.
          I think this boils down to JVM performance characteristics. Can the JVM
          provide adequate memory management for object creation, GC, etc.
          We are using NT, have a gigabyte of memory and using Sun's JVM version
          1.2.2.
          

Answer 1

          For starters, check: http://www.enteract.com/~bradapp/links/
          Search for "Garbage Collection & Memory Management"
          Srikant, [email protected], http://www.weblogic.com/, etc.
          Chaminda Peries wrote:
          > Rob could you please tell me where I can find the research you mentioned ?
          >
          > Thanks
          >
          > Chaminda Peries
          >
          > Rob Woollen wrote in message <[email protected]>...
          > > In general, there is a benefit to clustering multiple java vms on a
          > single
          > >multi-processor box.
          > >
          > > Most (if not all) current java vms will stop all the threads, initiate
          > a
          > >garbage collection, and then restart each thread. During the gc pause,
          > you
          > >will generally see 1 cpu at 100% while the others idle.
          > >
          > > By running multiple jvms, you will stagger the collection times.
          > >
          > > If you are interested, there is a large body of research on concurrent
          > and
          > >incremental gc algorithms.
          > >
          > >-- Rob
          > >
          > >Todd Shutts wrote:
          > >
          > >> Is there typically a performance benefit from clustering EJBs on single
          > box?
          > >> That is, running a number of smaller (memory footprint) Weblogic Servers
          > on
          > >> a single machine vs. one larger instance. In its simplest form, we have
          > an
          > >> application where stateless session beans are used to perform
          > transactions
          > >> on behalf of the client.
          > >>
          > >> I think this boils down to JVM performance characteristics. Can the JVM
          > >> provide adequate memory management for object creation, GC, etc.
          > >>
          > >> We are using NT, have a gigabyte of memory and using Sun's JVM version
          > >> 1.2.2.
          > >