[geos-devel] Update to 3.9?

[Daniel Baston]

After collecting the inputs and writing to WKT:

\copy (select st_astext(st_collect(geom), 18) from wsa_vi) to
~/data/wsa.wkt;

I'm seeing 6 seconds in GEOS (not including WKT parsing)

bin/perf_unary ~/data/wsa.wkt union
# Reading geometries from /home/dan/data/wsa.wkt
# Read 1 geometries.
# 6,137,885 usec

vs 14s in JTS (including WKT parsing)

time bin/jtsop.sh -a ~/data/wsa.wkt -op Overlay.unaryUnion
# 14.43s user 0.47s system 202% cpu 7.354 total

Dan



On Wed, Nov 25, 2020 at 8:21 PM Paul Ramsey <pramsey at cleverelephant.ca>
wrote:

>
>
> > On Nov 24, 2020, at 5:01 PM, Regina Obe <lr at pcorp.us> wrote:
> >
> >
> >> All the performance talk is mostly because JTS still runs a lot faster
> > than GEOS
> >> for some bulk processing. My current test is a big union of watershed
> >> boundaries, about 6MB of data, which takes about 20s under GEOS and
> >> about 25% of that under JTS.  It's a big gap, and in theory the two code
> > bases
> >> are pretty aligned right now. Same overlayNG engine, etc. So I figure
> > there
> >> has to be a big implementation ball of performance hiding under the
> covers
> >> somewhere. No luck thus far.
> >>
> >> I think we're close, looking forward to release :)
> >>
> >> P
> >> _______________________________________________
> >> geos-devel mailing list
> >> geos-devel at lists.osgeo.org
> >> https://lists.osgeo.org/mailman/listinfo/geos-devel
> >
> > You have your sample watershed data set.  Would like to test it out
> myself.
>
> https://www.dropbox.com/s/9ruvs6gxe3yl93c/wsa_vi.sql.bz2?dl=0
>
> I union all these. It takes about 20s on my Air.
>
> p
>
> >
> > Thanks,
> > Regina
> >
> > _______________________________________________
> > geos-devel mailing list
> > geos-devel at lists.osgeo.org
> > https://lists.osgeo.org/mailman/listinfo/geos-devel
>
> _______________________________________________
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> geos-devel at lists.osgeo.org
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>
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