[geos-devel] Update to 3.9?

[Paul Ramsey]

Well then, good news from me, since with a Release build, I can run that union in 4.7s in GEOS and 6.6s in JTS.
w00T!
Now I'm wondering if my other performance work, that yielded relatively little in Debug might be bigger winners in Release...
P.

> On Nov 25, 2020, at 7:37 PM, Martin Davis <mtnclimb at gmail.com> wrote:
> 
> Seems best to try a non-debug build...
> 
> To run in JTS you can use:
> 
> time bin/jtsop.sh -a ~/data/wsa.wkt -op OverlayNGRobust.unaryUnion 
> 
> You should run off master for this (or a very recent pull)
> 
> Actually it's better to use 
> 
> bin/jtsop.sh -time -a ~/data/wsa.wkt -op OverlayNGRobust.unaryUnion 
> 
> That will time only the operation, excluding the I/O.
> 
> 
> On Wed, Nov 25, 2020 at 7:30 PM Paul Ramsey <pramsey at cleverelephant.ca> wrote:
> 
> 
> > 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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> > > https://lists.osgeo.org/mailman/listinfo/geos-devel
> > 
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