[Tilesathome] simple optimization instead of asynchronous upload
Dirk-Lüder Kreie
osm-list at deelkar.net
Mon Feb 7 12:59:05 GMT 2011
Am 07.02.2011 12:06, schrieb Łukasz Stelmach:
> Hello.
>
> I've set up T at H yesterday and noticed a small efficiency problem with a
> forked setup. tilesGen.pl starts with a single, simple z12 256x256 tile
> and goes towards more complex pictures. This leaves it with a *single* z17
> inkscape trying hard. It would be much more efficient if z17 was the
> first zoom levevel to deal with because (lets assume a spherical cow)
>
> Let Fork equal 2.
> Let time(z_n)=4*time(z_{n-1})
> If time(z_12) = 1 then time(z_12..z16) = 341 and time(z17) = 1024
>
> If the first thread starts with z17 then the other can do all other
> levels in parallel
>
> If time(z_n) = 2*time(z_{n-1})
> then
> time(z_12..z16) = time(z17)-time(z_12)
>
Short answer:
It makes sense to run the z17 thread alone, because it's not cpu but RAM
bound.
--
Dirk-Lüder "Deelkar" Kreie
Bremen - 53.0901°N 8.7868°E
Ceterum censeo Carthaginem esse delendam.
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