<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 12 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Consolas;
panose-1:2 11 6 9 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri","sans-serif";
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:70.85pt 70.85pt 70.85pt 70.85pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body lang=NL link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Dear all,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I had a nice resample filter running as part of a 32 bit application on windows7. It did the<o:p></o:p></p><p class=MsoNormal>very simple job of ‘upsampling’ a 3D MRI dataset to a higher resolution using a nearest neighbour<o:p></o:p></p><p class=MsoNormal>interpolator. Worked like a charm!<o:p></o:p></p><p class=MsoNormal>Since I kept running into memory allocation bounds elsewhere in the application, I just recompiled everything to 64 bit, using VC++<o:p></o:p></p><p class=MsoNormal>Express 2010. The application runs fine but the resample filter has become extremely slow<o:p></o:p></p><p class=MsoNormal>(I’m talking 30 minutes versus 30 seconds!).<o:p></o:p></p><p class=MsoNormal>Since I read earlier postings about avoiding debug mode, I made sure to stick to release mode. Just<o:p></o:p></p><p class=MsoNormal style='text-autospace:none'>added debug information (program database mode). I have traced the problem down to the<o:p></o:p></p><p class=MsoNormal style='text-autospace:none'>‘<span style='font-size:9.5pt;font-family:Consolas'>ResampleImageFilter< TInputImage, TOutputImage, TInterpolatorPrecisionType >::</span> <span style='font-size:9.5pt;font-family:Consolas'>LinearThreadedGenerateData(...’<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'>method in<span style='font-size:9.5pt;font-family:Consolas'> itkResampleImageFilter.hxx.<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'>The nested while loop over the output iterator (outIt) in this method takes ages to finish.<o:p></o:p></p><p class=MsoNormal style='text-autospace:none'>I’ve tried different multithreading settings (even disabling multithreading), as some posts elsewhere suggested the problem<o:p></o:p></p><p class=MsoNormal style='text-autospace:none'>might have something to do with that. As expected on my 4-core processor, having 4 threads is still<o:p></o:p></p><p class=MsoNormal style='text-autospace:none'>the best setting, so this seems to have nothing to do with it.<o:p></o:p></p><p class=MsoNormal style='text-autospace:none'>Any help would be much appreciated!<o:p></o:p></p><p class=MsoNormal style='text-autospace:none'><o:p> </o:p></p><p class=MsoNormal style='text-autospace:none'>Best regards,<o:p></o:p></p><p class=MsoNormal style='text-autospace:none'><o:p> </o:p></p><p class=MsoNormal style='text-autospace:none'>Erik<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>