Bad RMI Performance

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Tokka - 06 Dec 2005 09:55 GMT

Hi!

I just built a RMI Server and Client. It works very good on a single
machine.

Now i would like to run the server and 2 clients on differet machines.
This works too.
But after Client 1 has calld a remote Method, it seems that client2
need to reconnect to the server. The result is a bad perfomance. For me
it is not ok, to wait 5 to 8 seconds before i get a return from the
remote method.

The remote method returns me only an ID not more or less.

Do you have any hints for me??

Thanks
Tokka aka Claus-Martin

Excuse me for my bad english ;(

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Wil Hadden - 06 Dec 2005 14:06 GMT

Are you using RMI callbacks, ala
http://www.javaworld.com/javaworld/jw-05-1999/jw-05-javaqa.html#4 ?

If so then you may want to stick some kind of profiler on client2 to see
where the overhead is, or can you try sending the serialised data from
client2 to a flat file, just to see exactly what is being sent as you may
find you are sending a huge chunk of data.

Wil

> Hi!
>
[quoted text clipped - 16 lines]
>
> Excuse me for my bad english ;(

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Roedy Green - 06 Dec 2005 20:48 GMT

>But after Client 1 has calld a remote Method, it seems that client2
>need to reconnect to the server. The result is a bad perfomance. For me
>it is not ok, to wait 5 to 8 seconds before i get a return from the
>remote method.

get a packet sniffer and have a look what is happening. Are machines
just waiting or transmitting great hunks of data?

http://mindprod.com/jgloss/sniffer.html

Also try putting all three machines on the same LAN to rule out router
problems and slow Internet connections.

Signature

Canadian Mind Products, Roedy Green.
http://mindprod.com Java custom programming, consulting and coaching.

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E.J. Pitt - 11 Dec 2005 08:28 GMT

> Do you have any hints for me??

This is almost certainly a slow/misconfigured DNS issue rather than RMI.
Try pinging the server host from the client host and see how long that
takes.

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Bad RMI Performance

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