Subj : Re: Replacing SM with Rhino
To   : netscape.public.mozilla.jseng
From : Matthew Mondor
Date : Thu Jan 13 2005 12:43 am

> Has anyone tried or done this before in their embedding/application.
> APIs are different, of course, but we'd achieve better Java
> integration and apparently speed. I read somewhere Rhino can be faster
> 10:1 in some benchmark tests, using JIT compilation (not sure here if
> 10:1 refers to Rhino X SM or RhinoJIT X RhinoNoJIT). What would the
> major issues involved be?

I'm no definitive authority about this, but I'm rather confident that
this was comparing Rhino with a JIT and without one... I would be fairly
surprised if Java performance reached that of compiled C programs
(except perhaps in cases of very bad programming).

The gap between Java and C sure decreased, but it's not yet reaching the
same speeds in most cases (and although I often saw claims that it's
starting to reach comparable performance to C++ in some cases with a
JIT, well written C programs still yield better performance than C++
ones which need more runtime checks to implement the language.

Possibly that with Jazelle and an arm processor that has Java bytecode
support, applications written in C++ and Java could run with similar
performance however... Although I couldn't test this yet personally

If Rhino with a JIT exceeds SpiderMonkey performance, I sure would like
to also know why, as well as the particular code used to test the
benchmarks

.