Re: [Q] Question on GDL2

[David Ayers]

NeXT wrote:
> Hmm, I think the data is not cached, but yes, after some testing, the
>  data is cached. So, here comes another question ? :-) How one
> process can notify other processes, a data is changed so the cached
> data should be updated or refetched ? Through distributed
> notification? Or automatically done? 

There is no automatic syncronization between different processes running 
on the same machine or subnet.  Eventhough that may be a neat feature 
(as long as it's off by default).

You could use distributed notifications and EOGlobalID's of changed 
objects to syncronize process by invalidating them in the other 
processes which will then refetch them from the database.

> And though caching is done, raw
> mysql query and fetch result is faster... seems very strange. If I 
> recache the data using NSDictionary, it's very fast... Why EOF cache
> is slower than simple NSDictionary... ?

I'm not sure exactly what you are comparing, but when an 
EOEditingContext fetches objects, there's a bit that goes on behind the 
scene.  Now whether that is useful or relevant for your case, is another 
question.

I would be intersted on what you are timing exactly and how much slower 
GDL2 is.  Consider that there is an abstraction overhead.  Don't expect 
GDL2 (esp. using EOEditingContext) to be as fast as any native API.  Do 
expect it to be useful.

Please give me some more data to work with, too see what your bottle 
neck is.  I know there is lots of roome for optimization.  But I'd 
rather do it on concrete examples.

Cheers,
David