> > However to move to the original problem: How do we allow
> > transaction to executed between different EJB-servers (and
> possible other
> > "servers"/resources).
>
> By using an API that can be used to pass tx contexts. The API can
> defined what the context should look like (maybe implementation, maybe
> just interface) and some way to pass it to the underlying protocol
> handler.
When it reaches the protocol it must be transmitted in a standarised way
(e.g. in in a CORBA/IIOP service context) if you like to connect different
implementations. But if interoperability isn't a goal this is not an
issue;-)
> > Numbers please, i.e. is IIOP even 25% slower than JRMP or
> is it 10+ times
> > slower (as SOAP)? If you don't give some rough numbers I'll
> set up a simple
> > test (I've been busy programming PowerPoint lately).
>
> I don't have numbers, and this is hearsay (i.e. the CORBA
> people I have
> talked to mention numbers that are higher than what the
> equivalent JRMP
> numbers would be). Oh, btw, yes I know there was one guy that tested
> different ORB's and compared with JRMP. JRMP was about half compared
> with the best ORB if I remember correctly (i.e. 3ms/call on JRMP,
> 6ms/call with IIOP). Might be outdated though. Again, if you do some
> testing that'd be cool ("HelloWorld" + complex data passing would be
> relevant I think).
I'm putting together a performance test framework with some standard test
implementations. I wrote a Java interface (see below) for which I
implemented test clients (and servers...) using Appache-SOAP, JavaIDL and
JBoss (beta prod 2) and I ran everything locally under JDK1.3 on WinNT4.
public interface...
public void basicTest(short s, double d, String str) throws Exception;
public void blobTest(Blob b) throws Exception;
public void fooTest() throws Exception;
public void byteArrayTest(byte[] data) throws Exception;
I was very surprised to find that the SUN CORBA ORB-implementation was the
winner:
Roundtrip times:
SOAP-Apache: ~30 msecs
JBoss/JRMP: ~3-6 msecs
JavaIDL <1 msec (seems very strange)
I'll verify the code to see that I done anything stupid. None of the tests
printed trace information (I've hacked the SOAP RPCServlerRouter class to
remove trace info). After that I'll publish more detailed results.
Comments?
Cheers,
Per
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Per B�ckman
ENEA Business Software
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