[MapProxy] Caches: performance and conversion?

Travis Kirstine traviskirstine at gmail.com
Tue Mar 23 05:20:01 PDT 2021

My experience is that all the sqlite based caches work great once the data
is cached, however caching can be a bit slow.  I'm not sure how or if it is
possible but try to ensure MapProxy is exporting / converting multiple
tiles per transaction or you could be in for a very long wait.

On Mon, 22 Mar 2021 at 17:58, Immanuel Hayden <immanuel.hayden at gmail.com>

> Oooh that looks like just what I'm looking for. Thanks a lot for pointing
> that out. Still concerned about performance though, but let's just see :D
> On Mon, 22 Mar 2021 at 21:37, Travis Kirstine <traviskirstine at gmail.com>
> wrote:
>> Immanuel,
>> I haven't done this with MapProxy but have done something similar with
>> MapCache.  I believe the command you are looking for can be found here:
>> https://mapproxy.org/docs/1.13.0/mapproxy_util.html#export
>> On Wed, 17 Mar 2021 at 11:18, Immanuel Hayden <immanuel.hayden at gmail.com>
>> wrote:
>>> Hi!
>>> Short summary of my situation: I have about 1 TB of tiles between 100+
>>> projects (mostly file-cache based ... the horrors) and would like to
>>> migrate away to a different cache format. So far I've found geopackage to
>>> work rather nicely and also seemingly uses considerably less disk space
>>> (about half in my trials). However this leads to two questions:
>>> 1. Did anyone ever do a performance comparison between the different
>>> local caches? I am concerned with running into performance problems halfway
>>> through converting the data. This also includes resource consumption (i.e.
>>> does for example loading a geopackage cache stress memory more than a file
>>> cache?)
>>> 2. Is there some way to convert between cache types? Re-rendering takes
>>> a _long_ time due to the complexity of our maps, so while this was a good
>>> option for my test projects, it isn't for the bulk of the tile cache. If
>>> there is an option, how would I actually set that up? Maybe adding the
>>> existing cache as a WMS soure or something?
>>> Thanks for your inputs :)
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