Re: lots of SocketFactory threads hanging out

On Tue, Oct 07, 2008 at 03:33:46PM -0700, Mark Ackerman wrote:
> So as a followup to my last problem with intermittent connection
> problems....
> 
> doing a thread dump on our server I see a bunch of these:
> RMI RenewClean-[155.83.200.144:2960,rma.rmi.server.LimitedPortServerSocketFactory@52a393bc]" daemon prio=10 tid=0x0054c400 nid=0x2cf in Object.wait() [0xd58ff000..0xd58ffbf0]
[snip]
> Is this normal?

In general, yes, although when client socket factories are in use (as
is evidenced by the thread name above) there can be excessive creation
of such threads if the socket factory classes do not have appropriate
implementations of the Object.hashCode/equals methods.  Some
background:

http://archives.java.sun.com/cgi-bin/wa?A2=ind0611&L=RMI-USERS&P=1013
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=5053529
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4492317

> last part of the thread dump is:
[snip]
> PSPermGen       total 20480K, used 20112K [0xd7c00000, 0xd9000000, 0xdbc00000)
>  object space 20480K, 98% used [0xd7c00000,0xd8fa40d8,0xd9000000)
>
> So is it ok to have the PSPermGen object space at 98%?

That doesn't look unusual to me.

-- Peter

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