RMI Performance Slow... Any Help?

I have developed a RMI application in visual age for java, but the perform is very slow. (P.C. : 266MHz Pentium 2, 64MB, 600MB free hard disk space).

For example, to retrieve and populate 3 lists with data from  informix database is about 16sec.

The network that I am working on is Token Ring.

Is there any way I can improve RMI performance?
kiatyianAsked:
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fontaineConnect With a Mentor Commented:
Your problem is probably related to this FAQ:

"Why does naming bind and lookup takes an extraordinarily long time on Windows?"

http://java.sun.com/products/jdk/rmi/faq.html#bind

Be also sure your RMI server connects once for all to the database, instead of opening a new database connection for each new query, for example.


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jpk041897Commented:
One of the problems you might be running into (without seeing the pertinent parts of the code) is that you might be transfering a single field (or record) at a time. This causes considerable network overhead plus causing the DB to re-querry each time

If this is the case, try building a record that transfers an array, thus buffering the information, or building a large string  (or group of large strings) containing the result set of your Querry.

In general, what you need to pursue is to transfer large blocks of data per RMI transaction.

You could also implement an RMI buffering mechanism, but this is probably more work than is wort for your application.
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kiatyianAuthor Commented:
Hi jpk,

In fact, the result set retrieved from the database has been buffered into an array. The number of records retrieved for the 3 list boxes are 60, 200, 200 respectively.

According to your experience, have you encountered such performance problem in RMI? If you don't, how did you do that?

Thanks for your reply.


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jpk041897Commented:
I dropped RMI in favor of CORBA. RMI's binding mechanism is slow.

Best way to check if your problem is network centered or binding centered is to bind over a local loopback (127.0.0.1).

Time this close loop, if your problem is Binding oriennted, than you might want to consider changing dynamic binding to static binding. If the times are slow, look for proxy servers, firewalls, trafic and/or combinations of the above. Also check for your DB servers response times and work load. RMI is slow, but not nearly as slow as you are experiencing.
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