[ka-Map-dev] modification to tile cache structure

Morgan Pyne morgan.pyne at gmail.com
Mon Oct 23 22:19:10 EDT 2006

Hi Paul (and others!)

I would definitely welcome the change, as we have already reached the  
limits of an ext3 filesystem (~32768 subdirs) on a number of  
occasions. While we could solve this by moving to some other  
filesystem, I think that adding the extra depth is a good thing  
anyway -  ext3 is a common default filesystem for many Linux distros.

I was wondering however if it might be possible to migrate a cache to  
the new structure rather than completely invalidate it?  I'm sure I'm  
not the only one who would prefer to be able to keep my cache if  
possible - precaching again would take considerable time. If the  
change only involves adding a slash between the top and left values  
in the path then I'm guessing the cache migration could be a one- 
liner for a good Perl monger.

Another thing to consider might be to make this new cache structure  
optional, and default to the old one.

Thanks (for _all_ the good work on ka-map!),

On 24/10/2006, at 1:33 PM, Paul Spencer wrote:

> Devs (and others)
> Before we release 1.0, I'd like to change the tile caching  
> structure to include an extra level of directories by inserting a /  
> between the top and left values in the meta-tile directory.
> The change is trivial and safe, but it invalidates an existing  
> cache (well, makes it useless)
> What do you think of this change?
> Cheers
> Paul
> +-----------------------------------------------------------------+
> |Paul Spencer                          pspencer at dmsolutions.ca    |
> +-----------------------------------------------------------------+
> |Chief Technology Officer                                         |
> |DM Solutions Group Inc                http://www.dmsolutions.ca/ |
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