On Sat, Oct 02, 2010 at 01:28:48PM +0100, Kai Krueger wrote: > On -10/01/37 20:59, Peter Körner wrote: >> but renderd had a hard limit of 1000 tiles in the queue. > > For completeness sake, I thought I'd mention that you can change that > limit quite easily. Simply change the constant at > http://trac.openstreetmap.org/browser/applications/utils/mod_tile/render_config.h#L73 > > to a higher value and you should be done (well OK, the constant the line > below also should be adjusted). > > That limit used to be there, I think, as the queue used a linear list, > which meant adding and searching tiles where O(n), thus n was limited. > It now uses a hashtable lookup, so that limit could be much higher > without problems. > > On the main OSM tile server, I believe, that limit is still there as a > feature rather than a bug. In order to achieve a fast turn around time > for mappers, the queue is limited, thus also "limiting" the time a > request takes to get through the queue. Instead requests are dropped > completely and the next time someone views the tile, mod_tile again > tries to queue it. This has the advantage that frequently viewed tiles > are more likely to end up in the queue and then are quickly rendered. > > Ideally, you would probably have a large priority queue with the > priority boosted every time another request comes in for that tile. But > that isn't implemented. Does tirex support that?
No, its doesn't. But you could add something like this externally. Have a process read the log file and count requests and re-queue them with rising priority and possibly the "only-if-older-than-filter". It also supports an expire time for queued requests. So you can queue a metatile and give the request an expire time. If the metatile couldn't be rendered in time, it will silently drop out of the queue. If a new request for the same metatile comes in, the expire timer starts anew. Jochen -- Jochen Topf [email protected] http://www.remote.org/jochen/ +49-721-388298 _______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/listinfo/dev
