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Subject: Re: How to disable system.gc() calls every 60 seconds
To: "JCS Users List" <jcs-users@jakarta.apache.org>
Message-ID: 
 <OFC97BC731.2CF92DF1-ON8625718D.0065C47D-8625718D.0065D9FD@kohls.com>
From: Paul.Lewandowski@kohls.com
Date: Wed, 14 Jun 2006 13:32:29 -0500
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Just to let you know, adding the Java command line
-Dsun.rmi.dgc.server.gcInterval=3600000 to the remote server did not stop
the 60 second system.gc()s.

Paul


             Paul.Lewandowski@                                             
             kohls.com                                                     
                                                                        To 
             06/14/2006 12:36          "JCS Users List"                    
             PM                        <jcs-users@jakarta.apache.org>      
                                                                        cc 
                                                                           
             Please respond to                                     Subject 
             "JCS Users List"          Re: How to disable system.gc()      
             <jcs-users@jakart         calls every 60 seconds              
               a.apache.org>                                               
                                                                           
                                                                           
Thank you.

The default of one hour starts with JDK 6.0 (Mustang) but the reference you
gave me allows the setting of this value for any JDK using the Java command
line option of -Dsun.rmi.dgc.server.gcInterval=3600000 for 1 hour.  The
reference document for this is located at
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6200091.

You might want to also add to your documentation something else that has
change in regard to RMI defaults.  Starting with JDK 1.3.1 SR7 and JDK
1.4.2 the RMI connection pooling is turned OFF by default.  In order to
turn this on you need to add the Java command line option of
-Dsun.rmi.transport.tcp.connectionPool=true.

Paul


             Aaron Smuts
             <asmuts@yahoo.com
             >                                                          To
                                       JCS Users List
             06/14/2006 11:28          <jcs-users@jakarta.apache.org>
             AM                                                         cc

                                                                   Subject
             Please respond to         Re: How to disable system.gc()
             "JCS Users List"          calls every 60 seconds
             <jcs-users@jakart
               a.apache.org>


I cannot find any call to System.gc in the src/java
directory.  I don't think this is the cause.  What is
the symptom, you see gc every 60 seconds?  That's an
RMI default setting:

"Default GC interval lengthed to one hour (6200091)
    In previous releases, the maximum interval between
garbage collections of the local heap enforced by the
RMI implementation (while there are live remote
references or exported remote objects), which is
controlled by the system properties
sun.rmi.dgc.client.gcInterval and
sun.rmi.dgc.server.gcInterval, was one minute by
default. The default interval is now one hour, to
better accommodate applications with large heap sizes
without special configuration."

see:
https://java.sun.com/javase/6/docs/guide/rmi/relnotes.html


--- Paul.Lewandowski@kohls.com wrote:

> The JCS jar file is jcs-1.2.7.3.jar.
>
> We have the shrinker set to "false".
>
> Paul
>
>
>
>
>
>              Aaron Smuts
>
>              <asmuts@yahoo.com
>
>              >
>                    To
>                                        JCS Users
> List
>              06/14/2006 10:42
> <jcs-users@jakarta.apache.org>
>              AM
>                    cc
>
>
>
>               Subject
>              Please respond to         Re: How to
> disable system.gc()
>              "JCS Users List"          calls every
> 60 seconds
>              <jcs-users@jakart
>
>                a.apache.org>
>
>
>
>
>
>
>
>
>
>
>
>
>
> There used to be a System.gc() call in the memory
> shrinker thread, but this was removed over 2 years
> ago.  I don't think there are any others in the JCS
> code base.  I'll take another look.   . . .  What
> version of JCS are you running?
>
> --- Paul.Lewandowski@kohls.com wrote:
>
> > Does anyone know how to disable the system.gc()
> > calls that occur every 60
> > seconds on a remote JCS caching server?
> >
> > I have tried adding the java option
> > "-Xdisableexplicitgc" but it still does
> > not prevent this.
> >
> > Thanks.
> >
> > Paul
> >
> >
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CONFIDENTIALITY NOTICE:
This is a transmission from Kohl's Department Stores, Inc.
and may contain information which is confidential and proprietary.
If you are not the addressee, any disclosure, copying or distribution or
use of the contents of this message is expressly prohibited.
If you have received this transmission in error, please destroy it and
notify us immediately at 262-703-7000.

CAUTION:
Internet and e-mail communications are Kohl's property and Kohl's reserves
the right to retrieve and read any message created, sent and received.
Kohl's reserves the right to monitor messages by authorized Kohl's
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CONFIDENTIALITY NOTICE: 
This is a transmission from Kohl's Department Stores, Inc.
and may contain information which is confidential and proprietary.
If you are not the addressee, any disclosure, copying or distribution or use of the contents of this message is expressly prohibited.
If you have received this transmission in error, please destroy it and notify us immediately at 262-703-7000.

CAUTION:
Internet and e-mail communications are Kohl's property and Kohl's reserves the right to retrieve and read any message created, sent and received.  Kohl's reserves the right to monitor messages by authorized Kohl's Associates at any time
without any further consent.


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