Le 18/11/2010 16:58, Samuel Thibault a écrit : > Hello, > > Christopher Samuel, le Thu 18 Nov 2010 23:47:20 +0100, a écrit : > >> Does the information occur to the right of the socket with >> the closest distance to the devices ? >> > If your case, hwloc was apparently unable to decide whether the devices > where "inside" one or the other NUMA node. Could you also post the > output of gather-topology? >
Many dual-nehalem-EP boxes have a single I/O hub which is connected to both sockets, so no I/O affinity there. If your machine wasn't designed to have many big PCIe slots (e.g. to plug multiple GPUs), that's probably what's happening here. Otherwise, it could be a machine with two I/O hubs (any multiple big PCIe slots) and the BIOS not saying which one is close to which socket. Brice
