[Tilesathome] Long Request Take Time?

Dirk-Lüder Kreie osm-list at deelkar.net
Thu Sep 11 16:34:17 BST 2008


I'm going to elaborate a bit on what I wrote in this thread already.

Ian Dees schrieb:
> But this means my CPUs are sitting idle with no work to do, and I'm paying
> for their power and heat to do nothing. I'd rather see them doing preemptive
> renders of highly-edited areas or rendering those prio4 requests than
> sitting idle.

Basically, tiles at home is not like other distributed computing projects. 
Other projects solve workunits, and they remain solved. The base data 
does not change, but at most gets amended, and thus creates new 
workunits. After a workunit is done and returned to the server, it needs 
very little work on the server side. All this allows other distributed 
projects to almost always run at full speed.

T at H, on the other hand, has a limited workunit space of about 17 million 
workunits that have to be almost randomly, but constantly, updated, so 
you can't predict just how much crunching power you'll need in the next 
X hours, even without those ultra-easy prio4 tilesets we seem to render 
so much of, lately.

-- 

Dirk-Lüder "Deelkar" Kreie
Bremen - 53.0952°N 8.8652°E

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