[e2e] Software release of JavaSim 1.0

[Jon Crowcroft]

In message <20011023180302.A20417 at philou.ch>, Philippe Strauss typed:

 >>On Tue, Oct 23, 2001 at 10:23:24AM -0500, Jennifer Hou wrote:
 
 >>this JavaSim seems highly interesting indeed but..
 >>>     <4,000) nodes (on a PC with dual Pentium III 6000 MHz and 256 MByte
 
 >>I hope it's not 10 times slower than ns-2 :))

 Philippe 

we did a java version of ns
(and nam - see http://cs.baylor.edu/%7Edonahoo/NIUNet/javis.html
for a cool maintained version)
and had reasonabnly ok experience of performance with the right jvm
actually - there's no reason (apart rom occasional garbage collection)
that a java simulator should be a lot more slower than C++/Tcl than C++ is
slower than assembler (i.e. a factor 2 or 3 if sloppily coded)
assuming you have JIT...

added benefit of java is that threading it and multiprocessor are
nearly free compared with the hassles of doing same with C++ (though
there is this edinburgh rumoured multiproc version of ns...)

 cheers

   jon