On Sat, 19 Feb 2011 18:13:44 +0100, Sebastian Haase wrote: > Thanks a lot. Very informative. I guess what you say about "cache line > is dirtied" is related to the info I got with valgrind (see my email in > this thread: L1 Data Write Miss 3636). Can one assume that the cache > line is always a few mega bytes ?
Cache lines are typically much smaller, 16-512 bytes. In this specific case, since the stride of the `i` loop is only 2*sizeof(float) = 16 bytes << cache line size, threads running with different `i` tend to write to the same cache lines. -- Pauli Virtanen _______________________________________________ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
