[gdal-dev] Call for discussion on RFC 46: GDAL/OGR unification

[Even Rouault]

Ivan,

yes indeed, I missed that one. I'll update the RFC with it.
I think that the intent of RFC36 is covered by what is already proposed in RFC46
with the papszAllowedDrivers of GDALOpenEx().

I do not think that specifying the candidate driver(s) is that usefull in
utilities since the time to launch them will be generally higher than the
probing time. But that could be easily implemented later with an option if that
was really needed (e.g. gdalinfo foo.tif -driver gtiff or possibly gdalinfo
foo.jp2 -driver jp2ecw,jp2openjpeg).
Due to the work I did in OGR drivers to avoid repeated file access by using
GDALOpenInfo*, I don't think that GDAL drivers should be affected. And the OGR
drivers are registered after the GDAL ones. So if the file being opened is
really a GDAL dataset, the OGR drivers should have 0 impact on the opening time.
I did try to benchmark a bit that, but it is difficult to come to a firm
conclusion since there are many factors: hot/cold runs, whether you spawn a new
process or use an existing one, etc.. And the time being measured are a few tens
of milliseconds, so very sensitive to task scheduling.

Even

> Even,
>
> I think that RFC 36 should be included in your list of
> related RFCs and should be reconsider for adoption since the unification
>  would make the probing even more expensive.
>
> Regards,
>
> Ivan
>
> > From: even.rouault at mines-paris.org
> > To: gdal-dev at lists.osgeo.org
> > Date: Thu, 15 May 2014 20:47:32 +0200
> > Subject: Re: [gdal-dev] Call for discussion on RFC 46: GDAL/OGR unification
> >
> > Le jeudi 08 mai 2014 00:13:22, Even Rouault a écrit :
> > > Hi,
> > >
> > > This is a call for discussion on "RFC 46: GDAL/OGR unification"
> > >
> > >   http://trac.osgeo.org/gdal/wiki/rfc46_gdal_ogr_unification
> > >
> >
> > No reaction : no interest or no time to review yet ?
> > Or should I move that forward ?
> > But I'd prefer if such architectural changes could be a bit reviewed...
> >
> > > Best regards,
> > >
> > > Even
> >
> > --
> > Geospatial professional services
> > http://even.rouault.free.fr/services.html
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