topic Re: IPP very slow compared to OpenCV in Intel® Integrated Performance Primitives

IPP very slow compared to OpenCV

egrayver — Thu, 24 May 2007 00:58:58 GMT

I am trying to speed some code that uses the Open ComputerVision library. The function in question is:

cvCalcCovarMatrix

The identical (functionally) function in IPP is

ippsAccCovarianceMatrix_32f64f_D2

I just benchmarked the two, and the IPP version is 40x slower. This is for the same data, running in the same function, one after another. What could be going on?

I am running on a P4-3.8GHz, Win XP Pro.

Re: IPP very slow compared to OpenCV

Vladimir_Dudnik — Mon, 04 Jun 2007 18:37:58 GMT

something really strange, could you please provide more info re your testing conditions, size of data and so on. Or you probably can share your test case with us, to help us understand that?

Regards,
Vladimir

Re: IPP very slow compared to OpenCV

Intel_C_Intel — Thu, 07 Jun 2007 08:51:48 GMT

I measured and got IPP slow down about 3 times

This issue is corrected in IPP 5.3

Alexander