https://community.intel.com/t5/Intel-Integrated-Performance/ippiColorTwist-too-slow/m-p/779405#M1413 Hello,<DIV></DIV><DIV>I am using ippiColorTwist (more precisely ippiColorTwist32f_16_C3IR) for a 1024x1024 image with 3 samples per pixel, 2 bytes per sample. The average measured time is about 12ms, almost the same as running my C implementation for the same processing. The C implementation performs the operations described here<A href="http://software.intel.com/sites/products/documentation/hpc/composerxe/en-us/ippxe/ipp_manual_lnx/index.htm">http://software.intel.com/sites/products/documentation/hpc/composerxe/en-us/ippxe/ipp_manual_lnx/index.htm</A>plus a simple rounding to 0 for negative numbers.</DIV><DIV></DIV><DIV>Why is ippiColorTwist so slow? Am I missing something?</DIV><DIV></DIV><DIV>Here are the details about my configurations:</DIV><DIV>- Intel Core2 6300@1.86 GHz</DIV><DIV>- Windows 7 Ultimate, 64-bit</DIV><DIV>-using static linkage with dispatching for the IPP library</DIV><DIV>- ippInit() is called before any other ipp function</DIV><DIV>- ippiGetLibVersion() returns:</DIV><DIV><SPAN style="white-space: pre;"> </SPAN>major = 7</DIV><DIV><SPAN style="white-space: pre;"> </SPAN>minor = 0</DIV><DIV><SPAN style="white-space: pre;"> </SPAN>majorBuild = 205</DIV><DIV><SPAN style="white-space: pre;"> </SPAN>build = 1020</DIV><DIV><SPAN style="white-space: pre;"> </SPAN>targetCpu = "u8"</DIV><DIV><SPAN style="white-space: pre;"> </SPAN>Name = "ippiu8_l.lib"</DIV><DIV><SPAN style="white-space: pre;"> </SPAN>Version = "7.0 build 205.23"</DIV><DIV><SPAN style="white-space: pre;"> </SPAN>BuildDate = "Sep 1 2010"</DIV><DIV>- using Visual Studio 2008</DIV><DIV>- C implementation is compiled for Release, X64 with Full Optimization (/0x)</DIV><DIV></DIV><DIV>Thank you.</DIV> Mon, 01 Aug 2011 08:31:56 GMT Anca 2011-08-01T08:31:56Z https://community.intel.com/t5/Intel-Integrated-Performance/ippiColorTwist-too-slow/m-p/779405#M1413 Hello,<DIV></DIV><DIV>I am using ippiColorTwist (more precisely ippiColorTwist32f_16_C3IR) for a 1024x1024 image with 3 samples per pixel, 2 bytes per sample. The average measured time is about 12ms, almost the same as running my C implementation for the same processing. The C implementation performs the operations described here<A href="http://software.intel.com/sites/products/documentation/hpc/composerxe/en-us/ippxe/ipp_manual_lnx/index.htm">http://software.intel.com/sites/products/documentation/hpc/composerxe/en-us/ippxe/ipp_manual_lnx/index.htm</A>plus a simple rounding to 0 for negative numbers.</DIV><DIV></DIV><DIV>Why is ippiColorTwist so slow? Am I missing something?</DIV><DIV></DIV><DIV>Here are the details about my configurations:</DIV><DIV>- Intel Core2 6300@1.86 GHz</DIV><DIV>- Windows 7 Ultimate, 64-bit</DIV><DIV>-using static linkage with dispatching for the IPP library</DIV><DIV>- ippInit() is called before any other ipp function</DIV><DIV>- ippiGetLibVersion() returns:</DIV><DIV><SPAN style="white-space: pre;"> </SPAN>major = 7</DIV><DIV><SPAN style="white-space: pre;"> </SPAN>minor = 0</DIV><DIV><SPAN style="white-space: pre;"> </SPAN>majorBuild = 205</DIV><DIV><SPAN style="white-space: pre;"> </SPAN>build = 1020</DIV><DIV><SPAN style="white-space: pre;"> </SPAN>targetCpu = "u8"</DIV><DIV><SPAN style="white-space: pre;"> </SPAN>Name = "ippiu8_l.lib"</DIV><DIV><SPAN style="white-space: pre;"> </SPAN>Version = "7.0 build 205.23"</DIV><DIV><SPAN style="white-space: pre;"> </SPAN>BuildDate = "Sep 1 2010"</DIV><DIV>- using Visual Studio 2008</DIV><DIV>- C implementation is compiled for Release, X64 with Full Optimization (/0x)</DIV><DIV></DIV><DIV>Thank you.</DIV> Mon, 01 Aug 2011 08:31:56 GMT https://community.intel.com/t5/Intel-Integrated-Performance/ippiColorTwist-too-slow/m-p/779405#M1413 Anca 2011-08-01T08:31:56Z