Re: [Simple-support] any performance tricks?

[Jim S. <ji...@fu...>]

Thanks Niall,

No, by default protobuf serializes into a binary format 
(http://code.google.com/apis/protocolbuffers/docs/encoding.html). One 
could implement a formatter callback and cause the output to be XML, but 
for my needs binary is fine. I know that creates an unfair apples to 
oranges comparison in looking at Simple vs protobuf. Mostly I was just 
wondering if there were any known performance tricks I may have 
overlooked. FWIW, I'm transferring the resulting data over the wire and 
even if I serialized to XML, I'd end up zipping it to reduce the payload 
size.

Jim

Nia...@ub... wrote:
> 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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