Brice Goglin, le Tue 13 Dec 2011 16:41:08 +0100, a écrit : > Le 13/12/2011 16:22, Jeff Squyres a écrit : > > > > I can't speak for GPUs, but I think the PCI information will be useful to > > know what devices are close to what PUs / NUMA nodes. That information can > > be used to make decisions about binding, for example (i.e., you want to be > > "close" to the specific PCI resources that you'll be using). > > In most cases, you don't need PCI support for this, you juste manipulate > a cuda device, an ibv_device, a MX endpoint, ... and use one of the > inline helpers to get the corresponding locality (a cpuset).
A problem I see there is that although you can write such helper for Linux, nothing guarantees that it'll be so easy for other OSes. And you need to rebuild the application when a bug gets fixed. Samuel
