destructor's profile - activity

I know that this question is very old, but I arrived here when searching for a solution to a similar problem. In my case I wanted to invert an SPD matrix, and Cholesky factorization was good enough. I read the source code of Cholesky factorization in the library, and found that the main cause of the bad performances is reading memory locations in such a pattern that most of the reads are not cached. When solving this issue I got a performance boost of factor of almost 100 times faster. I use OpenCV version 2.4.13. I will be glad to provide more details if someone is interested.