[mapserver-users] testing mapserver large files rendering improvements

[Paul Ramsey]

On Thu, May 15, 2008 at 10:15 AM, Bart van den Eijnden (OSGIS)
<bartvde at osgis.nl> wrote:

> 1) how will Mapserver know by default which depth to use for the index? On
> large point shapefiles the default depth can result in negative performance.

This says to me the heuristic needs to be smarter.  I was just
wondering that, when Frank said that the QIX can be larger than the
SHP for points... that is not a given, perhaps the tree building code
needs to be a little smarter

> 2) currently shp2img does not report any error when it does not have write
> permission on Linux, but I guess the new approach will first check write
> permission before doing any analytics?

shptree you mean? right, this will have to check first.

> So it might make sense to have a layer setting to overrule the default
> depth? Or to overrule automatic creation at all for a specific layer?

if this option is enabled at compile time, the ability to shut it off
in the map file will also be enabled.

> Best regards,
> Bart
>
> Stephen Woodbridge wrote:
>>
>> Paul,
>>
>> I think this is the best option because it gives control to the package
>> builders and anyone that is a power user.
>>
>> I would also like to see msdebug report missing qix files. This is a
>> valuable tuning tools for power users.
>>
>> Thanks,
>>  -Steve
>>
>> Paul Ramsey wrote:
>>>
>>> I have another "third way" option, which would be a compile-time
>>> directive (--with-auto-qix) so that packagers can make dummy-friendly
>>> builds if they so desire.
>>>
>>> ??
>>>
>>> P
>>>
>>> On Thu, May 15, 2008 at 9:25 AM, Jeff McKenna <jeffmckenna at gmail.com>
>>> wrote:
>>>>
>>>> My vote is for Paul's default qix creation option, by MapServer.  Let's
>>>> make
>>>> life easy for those beginner Windows users.
>>>>
>>>> -jeff
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> On 15-May-08, at 12:07 PM, Frank Warmerdam wrote:
>>>>
>>>>> Daniel Morissette wrote:
>>>>>>
>>>>>> Guillaume Sueur wrote:
>>>>>>>>
>>>>>>>> In my mind, we should do the right thing by default, and give the
>>>>>>>> power users the option to opt out, rather than forcing everyone to
>>>>>>>> become a power user to achieve something as basic as indexed file
>>>>>>>> access.
>>>>>>>
>>>>>>> +1 for this approach
>>>>>>>
>>>>>> The right thing to do is not the same in everyone's eyes.
>>>>>
>>>>> Folks,
>>>>>
>>>>> I'm also against mapserver automatically creating .qix files, for the
>>>>> reasons
>>>>> Daniel and others have given.
>>>>>
>>>>> I'd add that current shapefile update tools (including he mapscript
>>>>> shapefile
>>>>> writing code, Shapelib and OGR) do *not* update .qix files.  If
>>>>> secretly
>>>>> create a .qix file for a shapefile that is being periodically updated
>>>>> all
>>>>> hell is likely to break out.
>>>>>
>>>>> BTW, .qix files can be *relatively* large.  For a shapefile of points,
>>>>> the
>>>>> .qix can easily be bigger than the .shx file.
>>>>>
>>>>> Best regards,
>>>>> --
>>>>>
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>>>>
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>>
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>>
>
>
> --
> Bart van den Eijnden
> OSGIS, Open Source GIS
> bartvde at osgis.nl
> http://www.osgis.nl
>
>