FW: FW: [Openstreetmap] Recent improvements to the editing applet

[SteveC]

* @ 31/12/05 11:21:17 AM mikel_maron at yahoo.com wrote:
> 
> Good recommendations -- it's worth getting some solid metrics, and
> determine an optimal tile size. And looking at the load order of
> tiles, vectors.
> 
> I believe the editor/viewer is requesting 5 x 4 tiles, since the
> bounding box does not overlap the pre-tiling precisely. 

That's what I remember from coding it, and what I get (20) from testing
it now.

> I'd guess there is some overhead in activating the tile server process
> to generate a tile so this will also slow things down.
> 
> So, now the server is having to generate 983,040 pixels (256*128*30)
> using 30 requests instead of 350,000 pixels (700*500) using 1 request.
>  At a minimum it is doing 2.85 times more work than before.  Not good

That's not the case: In the old model Mr. Applet would ask Mr. Server
for an arbitrary image that would most likely never get used again.
Tiles are cached so to some extent will save server load.

have fun,

SteveC steve at asklater.com http://www.asklater.com/steve/