I've been doing some profiling of our remote EJB3 invocations, and I just
wanted to post and share what I found out. I was able to achieve an average
50% performance boost for our remote calls by changing 1 line in
deploy/ejb3.deployer/META-INF/jboss-service.xml:
Original line:<attribute
name="InvokerLocator">socket://${jboss.bind.address}:3873</attribute>
New line:<attribute
name="InvokerLocator">socket://${jboss.bind.address}:3873/?serializationtype=jboss&socket.check_connection=false</attribute>
JBoss serialization gives a really nice performance boost. However, I did run
into a bug in JBoss AOP when I enabled it. I posted a patch for this at
http://jira.jboss.com/jira/browse/JBAOP-347.
The other change that gave an almost equally impressive boost was the
check_connection=false bit. The socket transport sends a 1 byte ping to the
server and waits for a 1 byte response before handing the socket back to the
client from the pool. So because of this, every remote invocation actually
involves 2 round trips by default. Adding this parameter to disable this check
shaves a few milliseconds off of each remote call, on average.
However, this does seem to cause a problem in that, once the socket connection
times out (default configuration value is 1 minute), the subsequent remote call
fails on the client side, because it tries to reuse the closed socket
connection. The call after this is fine because it gets a fresh connection.
So to resolve this, I increased the socket connection timeout to 10 minutes
(timeout=600000), and created a custom client-side interceptor that wraps the
invocation, checks for an IOException, and retries the call once when it
happens.
This seems to be working pretty well, and is significantly faster. If anyone
has any suggestions for how to squeeze some more performance out of the
transport, or sees anything potentially wrong with what I'm doing, I'd
appreciate hearing about it. :)
--Tim
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