[geos-devel] Update to 3.9?

[Paul Ramsey]

> On Nov 25, 2020, at 6:41 PM, Martin Davis <mtnclimb at gmail.com> wrote:
> 
> Actually OverlayNGRobust.unaryUnion will compare the current OverlayNG code to GEOS. However, OverlayNG is likely to be slower, in any case.
> 
> So:
> GEOS - 6.1 s
> JTS 14.4 s
> 
> That's an impressive difference in favour of GEOS.  I wonder why Paul's timings are so different?

OMG, I wonder... I have a debug build of GEOS (because, you know, debugging). Is that it? Otherwise, are both tests (JTS and GEOS side) running through the OverlayNGRobust? I suppose I should ask: how do I run the JTS test? Then I can cut out the middleman and run them all myself?

P

> 
> On Wed, Nov 25, 2020 at 6:00 PM Daniel Baston <dbaston at gmail.com> wrote:
> 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
> > 
> > _______________________________________________
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> > geos-devel at lists.osgeo.org
> > https://lists.osgeo.org/mailman/listinfo/geos-devel
> 
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