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<div>Rupert,</div>
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<div>We are working on the performance right now. There was a change made that introduced unexpected performance penalties (actually exposed an existing performance problem by exacerbating it to the extreme).</div>
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<div>Please follow along with this patch set as it propagates through the toolkit:</div>
<div><a href="http://review.source.kitware.com/#/c/6369/">http://review.source.kitware.com/#/c/6369/</a></div>
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<div>Hans</div>
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<div>-- </div>
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<div style="font-family:Calibri; font-size:15px"><font face="Arial" size="2"><span style="font-size:10pt">Hans J. Johnson, Ph.D.</span></font></div>
<div style="font-family:Calibri; font-size:15px"><font face="Arial" size="2"><span style="font-size:10pt"><a href="mailto:hans-johnson@uiowa.edu">hans-johnson@uiowa.edu</a></span></font></div>
<div style="font-family:Calibri; font-size:15px"><font face="Arial" size="2"><span style="font-size:10pt">Assistant Professor of Psychiatry</span></font></div>
<div style="font-family:Calibri; font-size:15px"><span class="Apple-style-span" style="font-size:13px; font-family:Arial">University of Iowa Carver College of Medicine</span></div>
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<div><span class="Apple-style-span" style="font-size:13px; font-family:Arial">W278 GH, 200 Hawkins Drive</span></div>
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<div style="font-family:Calibri; font-size:15px"><font face="Arial" size="2"><span style="font-size:10pt">Iowa City, Iowa 52242</span></font></div>
<div style="font-family:Calibri; font-size:15px"><font face="Arial" size="2"><span style="font-size:10pt">Phone: 319-353-8587</span></font></div>
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<span style="font-weight:bold">From: </span>Rupert Brooks <<a href="mailto:rupert.brooks@gmail.com">rupert.brooks@gmail.com</a>><br>
<span style="font-weight:bold">Date: </span>Thursday, July 19, 2012 8:19 AM<br>
<span style="font-weight:bold">To: </span>ITK <<a href="mailto:insight-developers@itk.org">insight-developers@itk.org</a>><br>
<span style="font-weight:bold">Subject: </span>[Insight-developers] itk v4 performance questions<br>
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<div>Hi,
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<div>I've been porting some code from itk 3.20 to itk v4. While i can achieve numerically identical results with a little work, I'm noticing a 10-30% performance decrease overall. At this point it seems kind of generalized, i have trouble tracking it down
to a specific routine or module which makes me think it may be buried in low level code.</div>
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<div>It does not seem to be the GetInput issue raised earlier on the list.</div>
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<div>This is on Visual Studio 2005, XP, 32 bit. I do not know if it is generalized - indeed, it could easily be the case that modern C++ which compiles better on gcc and clang is confusing this old compiler.</div>
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<div>Are there already any ITK performance benchmarks?</div>
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<div>Rupert<br clear="all">
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Rupert Brooks<br>
<a href="mailto:rupert.brooks@gmail.com">rupert.brooks@gmail.com</a><br>
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