Why is there huge performance hit in 2048x2048 versus 2047x2047 array multiplication?

Question

I am making some matrix multiplication benchmarking, as previously mentioned in Why is MATLAB so fast in matrix multiplication?

Now I\'ve got another issue, when mu

Answer 1

Louis Brandy wrote two blog posts analyzing exactly this issue:

More Cache Craziness and Computational Performance - A beginners case study with some interesting statistics and attempts to explain the behavior in more detail, it does indeed come down to cache size limitations.