[help-GIFT] Re: Testing GIFT-modifications

[Jonas Lindqvist]

Hi again!
(This email is really directed to address@hidden, but following  
Julia's example, I'll cc the help-gift list, in case someone else is  
interested)

> I'm just modifying the feature extraction program, so I have a small
> shell script that runs the extractor from upstream, and then diffs
> that against the result of 'my' extractor, 40 or so times.

Yeah, that would be a good way to do it I suppose. I guess one could  
write a quick hack that starts a server and sends various queries to  
it, to make sure the response is the same over and over again... I  
don't know what queries are really relevant though...

> I've religiously avoided C++, as I've seen too many college grads
> who think the whole world fits their object model, and who write
> *HORRIBLE* performing applications. to say nothing of how they look.

You can easily tell the difference between an experienced C++  
programmer and one that just believes he's advanced by looking at how  
many "free functions" and template functions he's using (especially  
in anonymous namespaces, and such). Over-designing and thinking  
"everything" needs to be an object is common, and it's really bad for  
performance. Objects are great for some things though. But you can  
write object oriented code in C if you want to. But C++ adds some  
really neat stuff to the language besides classes, so I like using C+ 
+ for this kind of programs.

> I justify it to myself by knowing I've got leaps and bounds of
> improvements to add to the C feature extractor.

How do you find the bottlenecks? Some profiler?

> After todays commit, CVS should run at 1.42 on my machine,
> VS 0.1.14 running at 1.9, and my 'private' branch running at .85!

Sounds great... Is the private branch about to be committed any time  
soon? I'm going to index some 90000 images any week now, but would  
rather wait for a faster extractor if it's coming... :-)

> I'm tired of spending hours waiting on my images to import, how
> about you? ;)

Hours? Days... :-)


/Jonas