Re: Overhead and Best Practices

For some hard numbers from someone who is probably one of the most
demanding of developers in terms of performance, see this >
http://www.biglist.com/lists/xsl-list/archives/200503/msg01408.html <
post from Dimitre Novatchev from over a year ago.

"Typically a transformation with Saxon.NET may take 5-10% longer than
with Saxon8.3

However, there are isolated cases (predominantly when arithmetic
calculations are performed) when a Saxon.NET transformation  may be as
much as twice faster as the corresponding Saxon 8.3  one."



On 4/19/06, Jeroen Frijters <jeroen@xxxxxxxxxx> wrote:
> Mark Proctor wrote:
> > IKVM with Drools 2.x has been a great success. We are now
> > looking to do something similar for Drools 3.0. However we
> > are under pressure for a full port of the core code - which
> > I want to resist due to the resources needed to maintain
> > such an effort.
> >
> > One key issue that .Net developers bring up is the overhead of using
> > IKVM - quoting figures of over 20%. I have no empiracal facts, but I
> > find that hard to be true.
>
> In general 20% sounds way too high, but some operations are
> significantly slower. For example, exception handling is much slower
> under IKVM than under either pure .NET or Java.
>
> Dynamically loading Java classes is also pretty inefficient, but for
> statically compiled code the overhead typically is low.
>
> Another issue plays more at the design level, if you rewrite and
> re-design your code for .NET you're more inclined to use .NET specific
> features (like for example value types) that can affect performance in a
> more significant way.
>
> > Also maybe a "Get the Facts" document might help, as i have
> > some users worred about a Frankenstein system; even though I tell
> > them that running Java on .Net is no different than runny Python
> > or VB, it all compiles down to IL.
>
> That's true, but a significant drawback of IKVM is the fact that you
> have to ship the Java class libraries (in the form of
> IKVM.GNU.Classpath.dll).
>
> Regards,
> Jeroen
>
>
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<M:D/>

M. David Peterson
http://www.xsltblog.com/
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