Re: [aspectj-users] Best practices in optimization

[Simone Gianni <simoneg@xxxxxxxxxx>]

I was also thinking that new metrics Andy added to the replacement jars 
for Thomas could be left there, eventually with a switch for activating 
them, and proper explanations written somewhere to interpret that 
output. For example :

fastShadowMatching
   This indicates how much time the weaver is spending in 
fast-matching. Fast matching is an optimized matching algorithm that 
takes into account more specific point cuts before generic ones, so that 
it can determine faster if a given method in a given class matches or not.
   If you see that a small amount of time is spent into this cycle in 
respect to total build time, then probably your point cuts are very 
generic and could be scoped better. In this case scoping at class level 
is what is needed.
   Some ways to scope your point cuts so that fast matching can be used 
are :

- Include a within(Type) along execute() pointcuts.
   execute() is by definition generic. In fact, execute(public void 
MyType.setSomething(int)) includes also execution of setSomething in 
every subclass of MyType. If you intend to only match execution of 
setSomething in MyType and not also in subclasses you can add 
within(MyType).
- what else?


Also, adding a "performance XLint" option(s), disabled by default, could 
be a useful tool to see if/where the weaver is having performance 
problems, like for example being unable to use fast matching, or other 
places where possible optimizations are not engaged because of 
programmer's inexperience.

Just my 2 cents.

Simone


Simone Gianni wrote:
> Ciao Bepi,
> yes, I also agree that such instructions are needed. I also have some 
> very long build times.
>
> Simone
>
> Bepi Esposito Vingiano wrote:
> > Hi to all.
> > I've followed the 'Overall problem with AJDT performance' thread with 
> > interest but.
> > I'm working on a big project and trying to use aspectj and AJDT.
> > It would be very useful to have a 'guide to optimization' for 
> > building inside Eclipse with all the settings to make the build 
> > process better (in terms of time spent).
> > I have times of 3-4 minutes when building the project.
> > Ciao
> >  
> >  
> > ------------------------------------------------------------------------
> >
> > _______________________________________________
> > aspectj-users mailing list
> > aspectj-users@xxxxxxxxxxx
> > https://dev.eclipse.org/mailman/listinfo/aspectj-users
> >   


--
Simone Gianni            CEO Semeru s.r.l.           Apache Committer
http://www.simonegianni.it/