> where the number of padding locks is determined by how many lock > structures fit within a 128 byte cache line. > > This isn't exactly elegant coding, but it provides a useful improvement > on an 8-way SMP box when run on 8.0 base. OK, lets be brutal: this looks > pretty darn stupid. But it does follow the CPU optimization handbook > advice and I did see a noticeable improvement in performance and a > reduction in context switching. > > I'm not in a position to try this again now on 8.1beta, but I'd welcome > a performance test result from anybody that is. I'll supply a patch > against 8.1beta for anyone wanting to test this. >
I don't have an 8 way available right now but I can run tests on a 4 way Opteron if that would be helpful. Emil ---------------------------(end of broadcast)--------------------------- TIP 5: don't forget to increase your free space map settings
