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Geert wrote:
> I see no difference using sockets to communicate between
> two JVM's either on different machines or on the same machine.
Actually, there is (potentially) a big (performance) difference when
sockets connect between two processes on the same machine.
When TCP/IP knows that both "ends" of a socket are on the same machine
(i.e. the target address is 127.0.0.1 or "loopback,"), it is able to use a
simple mutex'd shared memory segment as the IP transport medium thingie...
As you can imagine, this can drastically improve performance.
AFAIK, this would be an "automatic" sort of optimization -- embedded in the
sockets implementation, below the JVM, and transparent to the JVM and user
alike -- so no code changes would be required to exploit it.
Having said all this, I'm not sure whether iSeries sockets use this scheme
-- I'm not a sockets guy -- but I've got a couple of feelers out.
-blair
Blair Wyman -- iSeries JVM -- (507) 253-2891
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
"I was born not knowing, and have had only a
little time to change that here and there." -- Richard P. Feynman
Geert Van
Landeghem To:
"'java400-l@midrange.com'" <java400-l@midrange.com>
<gvl@reynderseti. cc:
be> Subject: RE: Communication
between JVM's
Sent by:
java400-l-admin@m
idrange.com
04/12/2002 09:24
AM
Please respond to
java400-l
How long do you estimate the duration of the communication?
Have a look at the new Channel classes that allow non-blocking
input from files, sockets, ... perhaps this will benefit you.
I see no difference using sockets to communicate between
two JVM's either on different machines or on the same machine.
If you're afraid of to many socket communications and response time
is not a problem you could implement a wait queue which allows only
a maximum number of socket communications to be active.
Hope this helps.
Geert
-----Original Message-----
From: Price, Chris [mailto:chris_price@nsb.co.uk]
Sent: vendredi 12 avril 2002 14:08
To: 'java400-l@midrange.com'
Subject: RE: Communication between JVM's
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It's kind of a messaging system.
My WAS needs to sends messages to some clients, via a router. The router to
client part I'm happy to be socket based.
If the WAS & the router are running on different machines, then they will
have to use sockets to communicate. BUT if they are the same machine, will
it be inefficient to communicate via sockets?
I'm also nervous about large number of sockets being opened in the WAS, as
each one is going to tie-up a TCP/IP port for the duration of the
conversation.
Chris.
-----Original Message-----
From: Geert Van Landeghem [mailto:gvl@reynderseti.be]
Sent: 12 April 2002 15:01
To: 'java400-l@midrange.com'
Subject: RE: Communication between JVM's
In my humble opinion, no. You could use File objects
on disk, an OODBMS, ... to share information. The most low
level communication is always done by using sockets.
What kind of application do you want to write?
Geert
-----Original Message-----
From: Price, Chris [mailto:chris_price@nsb.co.uk]
Sent: vendredi 12 avril 2002 13:51
To: 'java400-l@midrange.com'
Subject: RE: Communication between JVM's
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Are there no more efficient solutions than sockets (which all these
ultimately use)?
-----Original Message-----
From: Geert Van Landeghem [mailto:gvl@reynderseti.be]
Sent: 12 April 2002 14:45
To: 'java400-l@midrange.com'
Subject: RE: Communication between JVM's
There are several possibilities using:
- sockets
- RMI or Remote Method Invocation (serialized objects over sockets)
- EJB (Application server) to clients
- Servlet/JSP (Application Server) to clients
...
Geert
-----Original Message-----
From: Price, Chris [mailto:chris_price@nsb.co.uk]
Sent: vendredi 12 avril 2002 13:25
To: 'java400-l@midrange.com'
Subject: Communication between JVM's
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All,
What is the best way of communicating between two different JVM's, running
on the same machine?
Chris.
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