RE: Limiting no of Entity Instances in the container

[Curt Smith]

I disagree with any assertion that running multiple VMs on a large SMP box is a waste.

 

I've corroborated advise given from many places (other J2EE vendors who support multi-VM)

that tuning a VM for less than 500 threads and 512Mb max memory is desirable.  Split into

many VMs as these limits are approached.  I.E. a 6 fast CPU box with 12GB RAM should

run around 6-12 VMs.   Some sophisticated J2EE vendors support auto-spinning up new

VMs as needed.  This list does not included WLS.

 

Why?  The VM becomes inefficient at it's own internal thread management as # of threads goes

up.  Experimental determination has found that >200 threads and the VM starts slowing. >512

and it's really getting inefficient.  Same goes for heap size management >512Mb of RAM.

 

curt

 

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Manuel
Sent: Friday, August 31, 2001 6:55 AM
To: Orion-Interest
Subject: RE: Limiting no of Entity Instances in the container

To run the two instances on the same machine is going to be a waiste - you are going be kicking up two JVM's etc or at least double amount of management overhead on the same machine for no reason. Your problem looks more like a software issue, either there is a bug in the orion software or chances are you are not synchronizing something properly, when you simulate the larger number of users the error becomes apparent. Rather try to solve the software problem than work around it ... kicking up two instance of the same application to get around a potential bug is only going to make your final system less predicable and unstable.

 

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Paolo Ramasso
Sent: Friday, August 31, 2001 8:13 AM
To: Orion-Interest
Subject: Re: Limiting no of Entity Instances in the container

ciao Biswajit
i use more than one oc4j istance on the same box, did you update the http,jms,rmi listening ports?
files:
http:default-web-site.xml, jms:jms.xml, rmi:rmi.xml
ciao
Paolo

Biswajit Nayak wrote:

 

Hi Gurus

      I want to configure two OC4J instances in one node for load balancing . I have a 4CPU E420 solaris box . With one OC4J I can support only 50 users . When I am simulating 100 users I am getting the following error messages . So I think mulitple OC4J instances will help .

Thanks

Biswajit
 
 

Errors on OC4J Console
  ************************
        java.lang.NullPointerException
        at com.evermind.server.jms.JMSServer.removeClient(JMSServer.java:712)
        at com.evermind.server.jms.JMSRequestHandler.run(Compiled Code)
        at com.evermind.util.ThreadPoolThread.run(Compiled Code)
 Failed to bind Launcher to port 9127

  Errors in global-application.log
  *********************************
 12:26 PM defaultWebApp: Servlet error
 javax.servlet.ServletException: No HTTP headers received from runform
        at java.lang.Throwable.fillInStackTrace(Native Method)
        at java.lang.Throwable.fillInStackTrace(Compiled Code)
        at java.lang.Throwable.<init>(Compiled Code)
        at java.lang.Exception.<init>(Compiled Code)
        at javax.servlet.ServletException.<init>(ServletException.java:16)
        at
oracle.forms.servlet.ListenerServlet.forwardResponseFromRunform(Compi
 led Code)
        at oracle.forms.servlet.ListenerServlet.doPost(Compiled Code)
        at javax.servlet.http.HttpServlet.service(Compiled Code)
        at javax.servlet.http.HttpServlet.service(Compiled Code)
        at javax.servlet.http.HttpServlet.service(Compiled Code)
        at com.evermind[Oracle9iAS (1.0.2.2) Containers for
J2EE].server.http.Se
 rvletRequestDispatcher.invoke(Compiled Code)
        at com.evermind[Oracle9iAS (1.0.2.2) Containers for
J2EE].server.http.Se
 rvletRequestDispatcher.forwardInternal(Compiled Code)
        at com.evermind[Oracle9iAS (1.0.2.2) Containers for
J2EE].server.http.Ht
 tpRequestHandler.processRequest(Compiled Code)
        at com.evermind[Oracle9iAS (1.0.2.2) Containers for
J2EE].server.http.Ht
 tpRequestHandler.run(Compiled Code)
        at com.evermind[Oracle9iAS (1.0.2.2) Containers for
J2EE].util.ThreadPoo
 lThread.run(Compiled Code)
***

---

Get your FREE download of MSN Explorer at http://explorer.msn.com