[omniORB] is there a way to check if two obj references are colocated?

[Renzo Tomaselli]

I had a similar problem for a distributed imaging application; however
colocated objects do exchange data as memory area addresses, the ORB is n=
ot
involved. The vtable of C++ does the trick so performance is really at
maximum. The great thing is that this is fully transparent to both client
and server coding. Moving objects to different address spaces doesn't
concern their coding, just performance (and off course retrieving the
counterpart object, this is a naming issue).
Btw, I'm interested to know why exchanging a large byte sequence through
TCP/IP (sockets) should be faster than through ORB marshalling.
Thanks,
                                             Renzo Tomaselli
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-----Original Message-----
From: Pedro Ferreira <paf@inescn.pt>
To: Grohmann, Axel <grohmann@ike.uni-stuttgart.de>
Cc: omniorb-list@orl.co.uk <omniorb-list@orl.co.uk>
Date: mercoled=EC 27 gennaio 1999 18.01
Subject: Re: [omniORB] is there a way to check if two obj references are
colocated?


>>> Hi, I wonder, given two object references (say a_ptr and b_ptr), is
>>> there any way to find out if they are colocated (in the same addressi=
ng
>>> space)?
>>
>>Why do you want to know that?(It seems a bit like you are trying to fin=
d
>out
>>something that is irrelevant in the CORBA thinking - it just does not
>matter where
>>an object lives, as long as you can contact and use it.)
>>
>>Axel Grohmann
>>
>
>Real world applications sometimes _do_ need to know it.
>Of course, you can always argue that, in a pure distributed system, it
>should be irrelevant.
>
>Imagine a scenario where you want to reansfer a large amount of data
between
>to objects. Due to performance requirements, you can't afford using the =
ORB
>to
>do it.
>So you decide to create a TCP connection between the two objects and use=
 it
>to transfer the data.
>Now, if if you knew the two objects were in the same address space, you
>could
>just pass a handle to a memory area and have a much better performance.
>
>What you should never do is to look inside the object reference as it is=
,
by
>definition, opaque. You should always use other means (read, interface
>functions)
>to do it.
>For instance, get process ids and host names, and compare them.
>
>Just my two cents.
>
>Pedro
>_____________________________________________________
>Pedro Alves Ferreira
>INESC - Porto   Tel: 02 209 42 28
>Pc da Republica, 93 R/C  Fax: 02 208 41 72
>4000 PORTO   e-mail: paf@inescn.pt
>
>
>