Re: Flow control by Exception

Jonathan,

>> If it was static it at the very least wouldn't incur the
>> fillInStackTrace JVM call which is so painful performance wise - being
>> static isn't an issue in this case since this exception is never
>> rethrown as best as I can tell.
>
> Yes, that is probably quite easy to address and I'll have a look at
> that in FreeCC. But note that any improvements on this will only be
> for 2.4.x. It may be a while before you can (at least while applying
> proper caution) standardize on FM 2.4. The best you can do meanwhile,
> I guess, is to see if you can lessen your use of ?eval.
>

Yep, I switched to an eval(expressionString) put into the context
which caches the parsed templates resulting in a noticeable
improvement in performance.

>>
>> Is the 2.4 FMParser going to be better about this?
>
> I think yes. Most probably... :-)

Understood. fwiw filIInStackTrace is #2 in tick count (behind gc) at
anywhere between 5 and 10% of cpu time on the azul box I've been
testing on. Now not all of those exceptions are freemarker but a good
majority are (well were, I keep finding more things to cache).

>  And actually, aside from
> this issue, 2.4 really does address a lot of the shortcomings in 2.3.
> (Annoying issues wrt java nulls, cleaning up scopes and variable
> declaration, are just a couple of examples...) Most of that stuff has
> has been done for like a couple of years, but we really just need to
> get it stabilized and out there. Not a great project management
> story.... it's mostly my fault I know... :-(

I'm fine with things like this only going into 2.4 ... as long as I
know they are being looked at :)  We've actually toyed around with the
idea of rewriting the FreeMarker parser in the past to fix this issue
among others .. that is, until you started to work on FreeCC. Thanks
for looking into this!


Regards,

Bruce Ritchie

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