Hi!

OK, I found the dark reason... I *had* Integers on the dictionary... damn!

  Yours

Miguel Arroz

On 2008/02/07, at 17:31, Miguel Arroz wrote:

Hi!

I need to serialize some collection objects (NSDictionaries, NSSets, etc) to save them in the DB. I'm doing some performance tests based on the Chuck's book page 43 note.

I have tried with the NSPropertyListSerialization and java Serialized stuff (as instructed on the Apple's note http:// docs.info.apple.com/article.html?artnum=75173&coll=ap).

For serializing and unserializing the same dictionary 100000k times, I have:

  NSData length: 667
  String length: 326
Property list serialization took 12272 milisecs, average 0.12272 per dict.
  NSData serialization took 49137 milisecs, average 0.49137 per dict.

  (Note average values are in milisecs/dict, not secs/dict.

  There is two things here that actually amazed me:

  1) String is shorter than binary by a factor of 2;
  2) String is a lot faster than binary.

  I admit I was expecting the opposite.

Facing this, I ask: string serialization is faster, shorter and human readable. Is there any dark reason why I should use binary serialization and not text?

  Yours

Miguel Arroz

Miguel Arroz
http://www.terminalapp.net
http://www.ipragma.com



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