[Maps-l] Tile expiry, a new attempt

[Kai Krueger]

On 01/02/2012 01:57 PM, Tim Alder wrote:
> Hello,
> please have in mind that we take the osm-labels-lang styles in  
> wikipedia only for zoom 0-6. For the more interesting zoom-levels we  
> take only default style for performance reasons. The only exeption is  
> the small hsb.wp ("Obersorbisch").

If the language labels are only used for zoom 0-6, then there is not
much point in expiring them at z15 - 18. I might as well disable expiry
and move over to a background re-render for everything but the default
style.

As zoom 0 - 10 tiles can take many minutes per tile, those zoom levels
would always be redered in the background anyway.

So far the server seems to be able to cope reasonably well with expiry
of z15 - z18. I will start expanding expiry further to try and get up to
expiring z11, which is the lowest zoom that is shown by default in
wikipedia.


> 
> People from ru.wp ask me to support russian but I did affraid that it  
> will be too much load for us. But now is russian map so popular that  
> it is perhaps usefull, we should use pre-rendering for it.

We should probably test it to see how it goes.
Who would be the people on the russian wikipedia to talk to, to see what
they need? Also, should any changes take effect, who can tel us if
everything is working out and if the changes are positively received?

Kai

> 
> |Kay: Please excuse my ignorance, but what is "default"? Is it the same as
> |"osm"?
> Yes.
> 
> Greetings Kolossos
> 
> 
> Zitat von Kai Krueger <kakrueger at gmail.com>:
> 
>> Hello everyone,
>>
>> Over the past month, the server has been busy trying to re-render all of
>> the tiles to try to ensure more up-to date maps. This process is more or
>> less complete now and all of the map tiles should then be at least from
>> the 1st of December 2011.
>>
>> As one month old tiles is still not overly satisfying, I am now trying
>> to re-activate diff based tile expiry again.
>>
>> The full expiry of all styles remains infeasible for the moment and so I
>> am trying to introduce expiry slowly to see how far it can be pushed.
>>
>> As a start, I have activated tile expiry only for the highest zoom
>> levels (z15 - z18) and then only for the styles that currently are
>> embedded in one of the wikipedias.
>>
>> As far as I can tell these are the following styles:
>>
>> osm-no-labels osm-labels-de osm-labels-ca osm-labels-bg osm-labels-da
>> osm-labels-el osm-labels-es osm-labels-fa osm-labels-fr osm-labels-it
>> osm-labels-lv osm-labels-nl osm-labels-no osm-labels-pl osm-labels-ru
>> germany default hikebike
>>
>> If anyone knows of a language that I have forgotten, please let me know
>> and I will include it as well.
>>
>> So far, it looks like the server can cope with this, although I have
>> only activated it earlier today. Should it remain this way, I will try
>> and expand the zoom levels.
>>
>> As it is critical to reduce the number of low zoom tiles rendered, as
>> those still kill performance, lower zoom tiles will probably not be
>> expired as frequently. E.g. perhaps Z14 - Z11 on a daily basis, below
>> that even only in the background.
>>
>> We will have to see, though, how performance behaves over time.
>>
>> Happy new year,
>>
>> Kai
>>
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>>
> 
> 
> 
> 
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