On Jun 25, 2010, at 12:53 PM, Jeff Squyres (jsquyres) wrote: > > I'm uneasy with “PU#15, for example, changes location from NUMA node > > #0 to #1.” The location doesn't have really changed, PUs have just > > been renumbered.
How's this: Notice that hwloc only sees half the PUs when SMT is disabled. PU#15, for example, seems to change location from NUMA node #0 to #1. In reality, no PU's "moved" -- they were simply re-numbered when hwloc only saw half as many. Hence, PU#15 in the SMT-disabled picture probably corresponds to PU#30 in the SMT-enabled picture. This same "PUs have disappeared" effect can be seen on other platforms -- even platforms / OSs that provide much more information than the above PPC64 system. This is an unfortunate side-effect of how operating systems report information to hwloc. -- Jeff Squyres jsquy...@cisco.com For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/
