[OSM-dev] Proposal: Database accelerator and dirty tile marker based on simple algorithm.

Barnett, Phillip Phillip.Barnett at itn.co.uk
Fri Sep 22 10:07:33 BST 2006

Talking of tiles, does anyone have a quick fix for blank tiles being
downloaded? ie, in the middle of a section of the slippy map, one gets a
persistent blank square, where the Landsat is visible, but the data
layer is invisible/transparent/nonrendered?  Reloading doesn't help,
presumably the server  hasn't/won't render(ed) the tile.

-----Original Message-----
From: dev-bounces at openstreetmap.org
[mailto:dev-bounces at openstreetmap.org] On Behalf Of Nick Hill
Sent: 22 September 2006 10:04
To: dev at openstreetmap.org
Subject: Re: [OSM-dev] Proposal: Database accelerator and dirty tile
marker based on simple algorithm.

Hello Erik

For an analysis of the problem and suggested solutions:

Perhaps setting up a db read-only with planet.osm on dev could help

Erik Johansson wrote:
> On 9/22/06, Nick Hill <nick at nickhill.co.uk> wrote:
>> Hello Lars
>> Throwing 20 or 30 http requests for busy un-rendered tiles is likely 
>> to provide a good simulation of a collapsing system.
> Is there a place where you can do this with out spending 4h setting up

> an osm server yourself? Finding slow queries and such is alot easier 
> than setting up your own test server.

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