Re: [tcljava-user] Tclblend performance

[D. J. H. <dha...@mi...>]

On Thu, 3 Jan 2002, Klara Ward wrote:
> Is running java through tclblend slower that pure java, and if so, how much?

The tclblend <-> java connection is done through reflection and JNI and
thus has the overhead of those API's.  I've heard figures like a method
call through reflection is 10-20x slower than a normal Java method call.

The way to work around this problem, then, is to reduce the number of
calls across the Tcl/Java interface -- in other words call a fairly
coarse-grained Java method that does a lot of work rather than making lots
of little method calls.

Of course, this is easily measurable -- just write a Tcl script that times
a couple hundred thousand method calls to a Java object, then write a
little Java program that does the same, and compare the times.

			-=- D. J.