[OSM-dev] rendered

[John Smith]

--- On Mon, 3/8/09, Jon Burgess <jburgess777 at googlemail.com> wrote:

> - The data source needing page lots of data into RAM
> needing lots of
> disk IO (e.g. large postgres DB or shapefiles)

There is 2G of system ram, although that is shared between various things running obviously.

> - With the postgis data source: setting estimated_extent to
> false and
> not providing a fixed extent for the layer. This causes
> Mapnik to issue
> an extent() query to the DB which normally results in it
> parsing all the
> data to determine the extent.

Ok, how do I set an extent or find out if it is set or ... ?

> The other issue would be a general slowness if you are
> trying to process
> too much data in your style but this would effect most
> tiles rendered,
> not just he first few.

It seems like a start up thing, but is triggered by the first request.