[postgis-devel] Problem in st_StriaghtSkeleton - Hangs!

[Tom van Tilburg]

My CPU also hangs at 100% on:
POSTGIS="2.5.0dev r16327" [EXTENSION] PGSQL="100" GEOS="3.6.2-CAPI-1.10.2
4d2925d6" SFCGAL="1.3.1" PROJ="Rel. 4.9.3, 15 August 2016" GDAL="GDAL
2.2.3, released 2017/11/20" LIBXML="2.9.4" LIBJSON="0.12.1"
LIBPROTOBUF="1.2.1" RASTER │

On Wed, Jan 17, 2018 at 9:42 PM, Regina Obe <lr at pcorp.us> wrote:

> Well it certainly takes longer than I care to wait and not cancellable.
> But CPU on my end is not spiking.
>
> But I'm running a 1.3 branch (dated in September 7, 2017), but
> unfortunately.
>
> I know the 1.2.2 version had tons of issues with things including
> ST_StraightSkeleton, so I suspect ST_StraightSkeleton is pretty unusable in
> the 1.2 versions.
>
> The rest of issues I see are with the output
>
> https://github.com/Oslandia/SFCGAL/issues
>
> I'm going to try to build against latests head (my last head build seems
> to have failed).
>
> I thought Stephen Mathers had written one that doesn't require SFCGAL,
> though I could be mistaken.
>
> Steve - if you are on list can you respond?
>
> Thanks,
> Regina
>
>
>
>
> -----Original Message-----
> From: postgis-devel [mailto:postgis-devel-bounces at lists.osgeo.org] On
> Behalf Of Stephen Woodbridge
> Sent: Wednesday, January 17, 2018 2:47 PM
> To: PostGIS Development Discussion <postgis-devel at lists.osgeo.org>
> Subject: [postgis-devel] Problem in st_StriaghtSkeleton - Hangs!
>
> Hi all,
>
> I have run into a problem using st_StraightSkelton() where it appears to
> hang at 100 cpu. Maybe an endless loop?
>
> select st_straightskeleton('POLYGON((256 760,518 760,518 630,674 630,674
> 239,673 239,127 239,127 240,126 240,126 513,127 513,127 514,126 514,126
> 630,255 630,256 630,256 760),(128 629,128 423,270 423,270 422,271
> 422,271 240,672 240,672 629,128 629),(258 759,258 631,516 631,516
> 759,258 759),(128 421,128 240,269 240,269 421,128 421))'::geometry);
>
> POSTGIS="2.3.3 r15473" GEOS="3.5.1-CAPI-1.9.1 r4246" SFCGAL="1.2.2"
> PROJ="Rel. 4.9.2, 08 September 2015" GDAL="GDAL 1.11.3, released
> 2015/09/16" LIBXML="2.9.3" LIBJSON="0.11.99" RASTER
>
> Can anyone reproduce this?
> Any idea how to work around it?
>
> Is there a non-CGAL version of skeleton?
>
> Thanks,
>    -Steve
>
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