Re: [Geotools-gt2-users] Slow rendering of GridCoverage objects

[Simone <sim...@gm...>]

Ciao steve,
that might explain this sloweness.

I have tried on fedora 5 and it is even faster than on windows xp.

One advice. please install the JAI ImageIO tools package since it ships with 
a nice
native encoder for png which should make things a bit faster anyway.


Let us know if you have more problems.

Regards,
Simone.


----- Original Message ----- 
From: "Steve.Ansari" <Ste...@no...>
To: "Simone Giannecchini" <sim...@ge...>
Cc: <geo...@li...>
Sent: Monday, February 05, 2007 2:59 PM
Subject: Re: [Geotools-gt2-users] Slow rendering of GridCoverage objects


> Hi Simone/Andrea,
>
> I'm using:
> Java jre1.5.0_04
> JAI installed from: jai-1_1_3-lib-windows-i586-jre.exe
> ImageIO from standard Java API - no native installs
>
> I isolated the slowness to this line in GridCoverageRenderer:
>            graphics.drawRenderedImage(finalImage, cloneFinalWorldToGrid);
>
>
> After some googling, I found this resolved Sun bug report:
> http://bugs.sun.com/bugdatabase/view_bug.do;jsessionid=8d01140ef3bea515d4807d013cfa:YfiG?bug_id=5073407
>
> However, this should be fixed in my JRE version and the example code
> with the bug report runs fine for me.
>
> I'm now going to try with the nightly snapshot.
>
> Thanks for looking into this,
> Steve
>
>
>
>
>
>
> Simone Giannecchini wrote:
>> Ciao Andrea,
>> I doubt it depends on differences between 2.3.0 and the actual code,
>> but I want to check.
>>
>> Since the timed code contains a write operation performed using
>> ImageIO directly it might be and old version of ImageIO giving
>> problems, or the absence of the native codec for PNGs, or difference
>> of performance on a different platform (I only tested on windows for
>> the moment).
>>
>> With a bit more info, I will try to spot the source of these problems.
>> Simone.
>>
>>
>> On 2/5/07, Andrea Aime <aa...@op...> wrote:
>>> Simone Giannecchini ha scritto:
>>> > Ciao Steve,
>>> > I need a couple more info about your platform:
>>> >
>>> >> java version
>>> >> os
>>> >> JAI and ImageIO version
>>> >
>>> >
>>> > I ran your example as it was (well, to be honest I removed the line
>>> > where you were showing the created coverage) and I got the following
>>> > execution time:
>>> >
>>> > PROCESSING TIME: 7.86 SECONDS
>>> >
>>> > I am using geotools 2.3.x compiled from SVN.
>>> >
>>> > If you provide me with more info, I can try to spot the cause of your
>>> > problems.
>>>
>>> Simone, may it be that the changes performed after the 2.3.0 release
>>> account for this speed difference?
>>> Cheers
>>> Andrea
>>>
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>>
>>
>
> -- 
> Steve Ansari
> Physical Scientist
> NOAA's National Climatic Data Center
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>
> -------------------------------------------------------------------------
> Using Tomcat but need to do more? Need to support web services, security?
> Get stuff done quickly with pre-integrated technology to make your job 
> easier.
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> http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
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