[MapServer-users] Ask for advice on Caching large layers on high zoom level

[Travis Kirstine]

I've found the other limiting factors are disk speed (SSD vs HDD) and cache
type.  SQLite can be easy to manage but the write locking during inserts
can really slow things down (adding more cores won't help in this case)
when compared to writing a simple disk cache.

I agree with Scott in that if you are using COGs you shouldn't really need
MapCache as you could look at alternatives to serve this data out as is.

On Fri, 2 Sept 2022 at 10:14, Scott <public at postholer.com> wrote:

> COG files imply that they are already tiled. I'd be curious as to the
> performance of map rendering using just the COG files without creating
> tiles.
>
> Being the 'size of Poland' doesn't really matter. It's the pixel
> resolution that is important. If the pixel resolution is 100 meters vs 3
> meters you will have different performance results.
>
> Seeding will always be bound by CPU, memory, etc. Creating an image
> (ami) of your system in AWS, then running multiple EC2's instance can be
> insanely fast.
>
>
>
> On 9/2/22 06:41, Marcin Niemyjski via MapServer-users wrote:
> > Hello,
> >
> > My job is to cache 365 layers. These layers consist of up to 30 .tif
> > (COG) files stored in a mapfile. These layers are roughly the size of
> > Poland and I would like to acquire their tiles for level 14 zoom. One
> > layer for these settings:
> > sudo mapcache_seed -c /DiscPlanetiler/2022/03/02/2022-03-02.xml -t
> > 20220302 -g PUWG1992 -z 10,10 -n 32
> > caches 83h (32 cores is my max). I am looking for advice on how I could
> > speed up the generation of these tiles.
> >
> > Thanks,
> > Marcin
> >
> > _______________________________________________
> > MapServer-users mailing list
> > MapServer-users at lists.osgeo.org
> > https://lists.osgeo.org/mailman/listinfo/mapserver-users
> _______________________________________________
> MapServer-users mailing list
> MapServer-users at lists.osgeo.org
> https://lists.osgeo.org/mailman/listinfo/mapserver-users
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/mapserver-users/attachments/20220902/ceff172c/attachment.htm>