[vtkusers] slow data load time (compared to AMIRA)

[Kate Kerekes]

I am using the binary version 4.2 (I have not updated to the new release
yet).

kate

-----Original Message-----
From: Mathieu Malaterre [mailto:mathieu.malaterre at kitware.com] 
Sent: Monday, September 27, 2004 1:07 PM
To: Kate Kerekes
Cc: vtkusers at vtk.org
Subject: Re: [vtkusers] slow data load time (compared to AMIRA)

Kate,

	How did you compiled VTK ? Could you send us your compilation flags 
(both c and c++) ?

Thanks
Mathieu

Kate Kerekes wrote:
> Hello All,
> 
> I am having problems with the time it takes to load a series of slices of
> data 512x512, 512 slices of shorts.  For example, loading such a data set
in
> AMIRA software takes 22 seconds, while in my vtk tcl program (using
> ImageReader2) shown below it takes 55 seconds.  
> 
> I do not think this is due to memory caching.  We have repeated this
> experiment on different machines restarting the machines in between
running
> the AMIRA load and the vtk load programs.
> 
> I am running this on my laptop running Windows XP with service pack 2, AMD
> athlon 64 chipset 3000+, with 512 megs of memory.
> 
> Does anyone know why there would be such a performance difference?  Am I
> using the right reader?
> 
> Any help would be appreciated.
> 
> Thanks,
> Kate Kerekes
> 
> #!/bin/sh
> load vtkCommonTCL.dll
> load vtkFilteringTCL.dll
> load vtkGraphicsTCL.dll
> load vtkIOTCL.dll
> load vtkImagingTCL.dll
> load vtkRenderingTCL.dll
> load vtkHybridTCL.dll
> source Interactor.tcl
> source bindings-rw.tcl
> source bindings-iw.tcl
> source bindings.tcl
> source setget.tcl
> 
> console show
> set time1 [clock clicks -milliseconds]
> vtkImageReader2 reader
> [reader GetOutput] ReleaseDataFlagOn
> 	reader SetDataExtent 0 511 0 511 0 511 
> 	reader SetDataScalarTypeToShort
> 	reader SetDataByteOrderToLittleEndian
> 	reader SetFilePrefix "C:\\mouse512\\"
> 	reader SetFilePattern "%s%.4d.slice"
> 
> reader Update
> set time2 [clock clicks -milliseconds]
> puts "time=[expr ($time2*1.0-$time1*1.0)/1000] seconds"
> 
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