Which option is faster...

[dennis luehring]

Am 05.08.2013 19:04, schrieb jicman:
>> so its totaly unclear if the presented code is your 2h monster,
>> what was
>> the runtime of your jscript?
> The files are in a network drive, so, that has some slowness
> already involved because of that.  The jscript use to take over 8
> hours.  The new D program has dropped that to under less than
> six.  This is huge to us.  But, I know that I can probably fine
> tune the program to make it a few minutes less. :-)

can you describe more detailed what are you doing - are you also reading
these files? why not run your tool on the server and only collect the 
results over network (wouldn't that be much faster)?

what is the impact of using the networkdrive? just copy your biggeste 
szenario on a local machine an run it against this to get a feeling how 
painfull the networkdrive communication is

>> > But I see that a great idea has been provided
>>
>> using a local variable for not lowercasing on each if is not an
>> great idea it is default programming style
> This will help.  If there are 100K files, which I know that there
> are more than that, it will help a little bit.
>> and i don't think you're be able to implement the tree
>> statemachine
>> when doing such simple performance killer like multiple
>> lowercase calls, and try to help youselfe by introducing
>> "continue"...
> Perhaps, but it's a good idea, nonetheless.

maybe your program can be better optimized globaly, but we need more 
information of what is the programing doing - can you give some
psuedo code like:

1. read all filenames recursivley -> 100k filenames
2. reduce down to known extensions -> 10k filenames
3. ...
4. ...
5. ...

i don't think that your lower-case is the major part of the 6h, there
must be other very slow parts in your project - which you don't find 
without putting in some bechmarking (and i don't understand why you 
don't start with benchmarking)