Re: [Simple-support] any performance tricks?

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Hi,
I was reading about performance improvements and I was thinking:
considered simple makes calls to various getAnnotation methods in order to
achieve serialization infos at each persister.write/read call(if I'm not
wrong), could caching annotations infos once at classloading time be a
solution?
Regards

2009/3/3 <Nia...@ub...>

> Hi,
>
> Does protobuf generate XML as a result of the serialization process?
> There is definitely room for performance improvements in Simple. Its
> been a while since I have done a release focused on such enhancements.
> Since the introduction of namespaces there has been a slight lag in
> performance.
>
> However, I have already begun a scanner framework based around Javassist
> which will hopefully provide a signifigant performance improvement over
> reflection.
>
> I think though it will be weeks rather than days before any signifigant
> improvements in this area are released.
>
> Niall
>
> -----Original Message-----
> From: Jim Sermersheim [mailto:ji...@fu...]
> Sent: 03 March 2009 15:53
> To: Gallagher, Niall-N
> Cc: sim...@li...
> Subject: Re: [Simple-support] any performance tricks?
>
> You're right, the first serialization takes hundreds of ms.
>
> I should have mentioned that my test serializes the object a few hundred
> times (just to make sure *everything* is primed -- cache, hotspot,
> etc.), then starts the timer and serializes it 10000 more times and
> calculates an average time per serialization.
>
> protobuf is a different beast in that you build a template and it
> generates your code for you. I prefer the more flexible annotation-based
> method of Simple, but might have to go with the speed of protobuf :(
>
> Nia...@ub... wrote:
> > Hi,
> >
> > The first time you serialize or deserialize an object will be much
> > slower that subsequent times. The best thing to do is write the object
>
> > once, then start your timer and write it again. You will find the
> > second time is much faster than the first.
> >
> > There is also a planned performance improvement for serialization,
> > where I intend to reduce the impact of namespaces, which have added
> > about 20% more overhead than needed. With regard to protobuf I am not
> > familiar with it. However you will find Simple as fast as JAXB or
> Xstream.
> >
> > Niall
> >
> > -----Original Message-----
> > From: Jim Sermersheim [mailto:ji...@fu...]
> > Sent: 02 March 2009 19:07
> > To: sim...@li...
> > Subject: [Simple-support] any performance tricks?
> >
> > Hi,
> >
> > I'm evaluating Simple along with some other tools that will serialize
> > data for purposes of data transfer across a network. I much prefer the
>
> > annotations-based way that Simple lets me prepare data for
> > serialization to the other tool I'm evaluating (Google protobuf), but
> > the performance is becoming a determining factor. For example, a
> > sample data structure which takes 1.53ms to encode with Simple only
> > takes 0.048ms to encode with protobuf.
> >
> > I'm just doing a very simple standard annotation markup with
> > @Attribute and @Element (the outer structure has a dozen fields and a
> > list of two inner structures, each having about a half-dozen fields).
> > Then I just use persister.write to serialize.
> >
> > I'm guessing maybe the reflection is taking a lot of time?  Not sure.
> > But are there any known performance tips/tricks to know about with
> > Simple?
> >
> > Thanks,
> >
> > Jim
> >
> >
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