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From Yang <teddyyyy...@gmail.com>
Subject Re: disable mysterious GC
Date Mon, 03 Oct 2011 21:29:01 GMT
looks doc is outdated :

$ grep '\.gcInterval'
./j2se/src/share/classes/sun/rmi/transport/ObjectTable.java
            new GetLongAction("sun.rmi.dgc.server.gcInterval", 3600000));


On Mon, Oct 3, 2011 at 2:21 PM, Jonathan Ellis <jbellis@gmail.com> wrote:
> I would expect that client=nodetool and server=Cassandra.  But sun's
> docs say that sun.rmi.dgc.server.gcInterval defaults to 60s which I am
> definitely NOT seeing.
>
> On Mon, Oct 3, 2011 at 4:12 PM, Yang <teddyyyy123@gmail.com> wrote:
>> the following source code in jdk , RMI part, forces a full gc every 1
>> hour , if no old gen gc has happened by then.
>>
>>
>>
>>
>>    /** maximum interval between complete garbage collections of local heap */
>>    private static final long gcInterval =              // default 1 hour
>>        AccessController.doPrivileged(
>>            new GetLongAction("sun.rmi.dgc.client.gcInterval",
>>                              3600000)).longValue();
>>
>>
>>
>> so if u have a large heap, and old gen gc does not happen frequently,
>> you need to set
>>
>> #sun.rmi.dgc.client.gcInterval
>> #sun.rmi.dgc.server.gcInterval
>>
>> to very high levels
>>
>
>
>
> --
> Jonathan Ellis
> Project Chair, Apache Cassandra
> co-founder of DataStax, the source for professional Cassandra support
> http://www.datastax.com
>

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