On Apr 13, 2011, at 1:32 PM, Brice Goglin wrote:
> Don't worry about the depth. Even if you have less levels of caches in
> some parts of the machine, or no hyperthreading or whatever different,
> we still build levels of identical objects. So you still get a
> consistent depth for all cores, threads, sockets, and different levels
> of caches. But obviously, you will see less objects when iterating
> through levels within the "smaller" part of the machine.
This would be good to add to the documentation; I've been doing manual
traversals of hwloc trees just to future-proof/heterogeneous-proof my code
(because I didn't know that the depth would always be the same for a given
object type even if some branches don't have all object types).
So let's say I have a (fictitious) machine with one socket with an L1 and L2
cache for its cores, and another socket that only has an L1 cache for its cores:
numa_node
/ \
socket 0 socket 1
L2 L1
L1 core
core
If I traverse down through children in the tree, are you saying that there will
be some kind of fake/empty object in the right sub tree corresponding to where
the L2 is in the left sub tree?
--
Jeff Squyres
[email protected]
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