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Re: [udig-devel] render performance
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Jesse,
Thanks for the patch.
uDig now renders this point shapefile faster than ESRI ArcExplorer Java
Edition on my system somewhere in between 4 and 5 seconds it takes in
uDig. Down from 25-30 seconds before. Still slower than ArcGIS, but I
think you could probably even reach that level if you wanted.
I knew you guys could do it.... Also render times seem to have become
independent of the uDig windows size on screen. Around 8 fold speed
increase on my system too. Very impressive.
Will this only affect point data? or has polygon rendering improved as well?
I say more patches like this. Keep up the good work.
And for those who have email systems that scramble messages with
attachements the patch is available for download here:
http://lists.refractions.net/pipermail/udig-devel/attachments/20050703/6a22c4c0/plugins-0001.zip
/Jesper
> Hi I've made a little patch like zip file. It will improve point
> rendering many times. Although I must warn you that if the file is a
> Multipoint shapefile it may not work yet. But the file linked to in
> this email works very well with the changes.
>
> To apply:
> - unzip the attached file in to the udig directory (if on linux) and run
> udig.
> - If on windows you might have to unzip it in the udig/eclipse directory
> (I'm on linux so I'm not totally sure). At any rate the file has to be
> unzipped into the directory containing the plugins directory.
>
> Jesse
>
> PS. I'll test the changes with a Multipoint shapefile as soon as I find
> one. I don't suppose you have access to a decent size one? I'd like at
> least 50000 features in it.
>
> Thanks and let me know if the patch works.
>
> Jesse
>
> On Thu, 2005-06-30 at 11:29 +1000, Jesper Kruse Nielsen wrote:
>> Hi
>>
>> I have been trying the uDig 1.0.0 release (JRE 1.4.2) rendering of the
>> test dataset below.
>>
>> I am using a Compaq P4 1.8 with 512Mb RAM.
>>
>> It takes uDig about 12 -15 seconds to render the dense datacloud in this
>> dataset when the window only takes up about a quarter of the screen
>> area.
>> Interestingly it takes much longer than that when I maximise the uDig
>> Window to full screen. In this scenarion the rendering takes between 50
>> and 60 seconds. Screen resolution is 1280x1024 16bit.
>>
>> I loaded the same dataset in ArcMap 8.2 and there it takes less than 2
>> seconds to render on the same machine regardless of ArcMap window size.
>> Following this I loaded the data in ArcExplorer 4.0.1 just to get a java
>> comparision. ArcExplorer 4.0.1 - Java Edition takes about 6 - 7 seconds
>> to
>> render the same dataset again on the same machine and running full
>> screen.
>>
>> The ESRI Arc products do not seem to have any detectable difference in
>> the
>> rendering time based on the size of the window. In uDig however that
>> seems
>> to make a lot of difference.
>>
>> >From my crude experiments there seem to be some way to go in terms of
>> tuning the uDig rendering. I have only tried with the dataset below and
>> not repeated the tests with lines and polygons.
>>
>> I m sure that if ESRI can make it render in 6-7 seconds on my machine so
>> can you. Just got to get under the bonnet there again and find out where
>> the bottleneck is.
>>
>> Keep up the good work!
>>
>> /Jesper
>>
>>
>> udig-devel-bounces@xxxxxxxxxxxxxxxxxxxxx wrote on 29/06/2005 20:11:58:
>>
>> > Can no-one else reproduce that this takes 10 seconds or more to
>> render?
>> >
>> > >Reading this, I thought I'd move on to the next test, which is of the
>> > >order of magnitude you quote. This one takes 10 or more seconds
>> torender...
>> > >
>> > > http://www.santafe.edu/~vince/pub/test-shp2.zip
>> > >
>> > >(and after a few zooms in and out I run out of Java heap space, but
>> that's
>> > >a different issue)
>> >
>> > cheers,
>> >
>> > Vince.
>> >
>> > _______________________________________________
>> > User-friendly Desktop Internet GIS (uDig)
>> > http://udig.refractions.net
>> > http://lists.refractions.net/mailman/listinfo/udig-devel
>>
>>
>> _______________________________________________
>> User-friendly Desktop Internet GIS (uDig)
>> http://udig.refractions.net
>> http://lists.refractions.net/mailman/listinfo/udig-devel
>
>
_/_/_/_/_/_/_/_/_/_/_/_/_/_/
Jesper Kruse Nielsen
www.krusedulle.net
