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  1.  Home
  2. JAVA400-L
  3. April 2002

RE: Communication between JVM's

Hi Blair.

Running an IBM app ( WebFacing) on the same machine as
WebSphere they communicate using standard sockets.
When the app runs it was automatically optimized to
open memory pipes instead.  How do I know?  The apps
broke and the information was readily available in the
log files ...

Jim Mason


--- Blair Wyman <blairw@us.ibm.com> wrote:
>
> 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
>
>
> This message is in MIME format. Since your mail
> reader does not understand
> this format, some or all of this message may not be
> legible.
> --
> [ Picked text/plain from multipart/alternative ]
> 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
>
>
> This message is in MIME format. Since your mail
> reader does not understand
> this format, some or all of this message may not be
> legible.
> --
> [ Picked text/plain from multipart/alternative ]
> 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
>
>
> This message is in MIME format. Since your mail
> reader does not understand
> this format, some or all of this message may not be
> legible.
> --
> [ Picked text/plain from multipart/alternative ]
> All,
>
> What is the best way of communicating between two
> different JVM's, running
> on the same machine?
>
>
> Chris.
>
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>
>
>
>
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