Dan Luu

stackoverflow knows how to measure my L1/L2 cache size! woo. http://stackoverflow.com/questions/12675092/writing-a-program-to-get-l1-cache-line-size …

@b0rk I think both the most upvoted answer and the corrections in the comments are wrong. I didn't read the expanded "more comments".

@danluu oh no! why is it wrong?

@b0rk The comment that prefetching will kick in is correct, but I don't see how the listed fix will work.

@danluu so it seems to me like adding up an char[10] n times would be fast, and adding a char[10*n] would be slower. is that true?

@b0rk Probably, but not a lot for small n. 128-byte cache line sizes are common, so you're still doing 12.8 ops / cache line and I'd expect