[mapserver-users] MapServer derived MVTiles Benchmark test vs. T-Rex tile server
karsten
karsten at terragis.net
Mon Mar 11 15:53:35 PDT 2019
Corrected map file link:
https://github.com/karstenv/mvt-benchmark/blob/master/MapServer/ne.map
_____
From: karsten [mailto:karsten at terragis.net]
Sent: Monday, March 11, 2019 23:15
To: 'mapserver-users at lists.osgeo.org'
Cc: 'Pirmin Kalberer'; 'Lime, Steve D (MNIT)'; 'lars at lingner.eu';
'jmckenna at gatewaygeomatics.com'; 'thomas.bonfort at gmail.com'
Subject: MapServer derived MVTiles Benchmark test vs. T-Rex tile server
Dear All,
I am working on optimizing a MapServer /MapCache configuration of a
benchmark for creating MVT tiles (seeding) of MapServer - versus T-Rex.
This will be featured in a presentation at the German FOSS4g ('FOSSGIS')
2019 in Dresden at the end of this week. The whole thing is based on Pirmin
Kalberer's automated vector tile benchmark see -
http://blog.sourcepole.ch/2018/09/06/the-tale-of-a-vector-tile-benchmark/ .
Thus I created a similar configuration of the Natural Earth Data based world
map for MapServer (my favorite rendering engine !) to run it against T-REX..
Now Pirmin has added this into the GitHUB repository as a 'MapServer' branch
see - https://github.com/pka/mvt-benchmark/tree/mapserver
Results of one of my first trial benchmarks can be found here
https://github.com/karstenv/mvt-benchmark/tree/master/firsttests .
Unfortunately my favorite software (MapServer /MapCache.fcgi) is falling
pretty far behind in seeding speed in these tests
see e.g. in
https://github.com/karstenv/mvt-benchmark/blob/master/firsttests/http.jpg
Thus, I wanted to call in the experts to find out what configuration tweaks
will help to increase the MapServer / Mapcache performance.
So far my next steps I will be working on
----------------------------------------------------------------------------
----------------------
1.) Setting the correct map file parameters to match the T-Rex configuration
for the FORMATOPTIONS
"EXTENT" and "EDGE_BUFFER" in the OUTPUTFORMAT bloc.
OUTPUTFORMAT
NAME "mvt"
DRIVER MVT
FORMATOPTION "EXTENT=512" # default is 4096. # Comment by Pirmin for
t-rex this is 'tile_size' (per Layer): Width and height of the tile
(Default: 4096. Grid default size is 256)
FORMATOPTION "EDGE_BUFFER=20" # Comment by Pirmin - seems to be the
'buffer_size' in mvtbench.toml , is set to 3 for the Country layer, for all
others
END
Any suggestions wthat my best bet settings are in the map file is for
MapServer for "EXTENT" and "EDGE_BUFFER" ?
----------------------------------------------------------------------------
----------------------
2.) Tweaking the data statement of the map file to match the T-Rex config
So far I have e.g. for the countries layer
DATA "wkb_geometry from (SELECT * FROM ne_10m_admin_0_countries) as temp
using unique ogc_fid using SRID=3857"
while T-Rex has
sql = """SELECT wkb_geometry, adm0_a3, mapcolor7 FROM
ne_10m_admin_0_countries WHERE min_zoom::integer <= !zoom! AND wkb_geometry
&& !bbox!"""
see
https://github.com/karstenv/mvt-benchmark/blob/master/t-rex/mvtbench.toml
I am still trying to match the T-Rex statement above but did not come up
with a suitable comparable MapServer data statement so far.
Any suggestions for this anyone ?
----------------------------------------------------------------------------
----------------------
3.) Does anyone have any other/ additional suggestions what else might help
to increase MapServer /MapCache performance ?
Thanks
Karsten
PS: The map file used is here
https://github.com/karstenv/mvt-benchmark/blob/master/MapServer/mapcache_mvt
.xml,
the MapCache config here
https://github.com/karstenv/mvt-benchmark/blob/master/MapServer/mapcache_mvt
.xml
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