[mvapich-discuss] MVAPICH2 1.5 hwloc issue

[Eoin McHugh]

On Tue, Sep 14, 2010 at 01:43:56PM -0400, Jonathan Perkins wrote:
> Thanks the for the note.  We've recently resolved an issue where our
> internal version of hwloc was not being properly built in our shared
> library.  Can you describe your issue a bit more.  Are you seeing
> build or linking failures or unexpected operation at run time?

Hi Jonathan,

Thanks for your reply. I'm seeing unexpected operation at runtime. I've
a dual socket hex-core Westmere system which happens to have hyper
threading  enabled. I'm building HPCC against MVAPICH2 and observing it's 
behaviour with 12 processes on a compute node. With either the internal 
hwloc and an external static library version of hwloc I'm seeing random
non-deterministic process placement. With an external shared library
hwloc processor affinity works and can be controlled with the usual
MV2_* variables.

I'm attempting to build the default static library only version of
MVAPICH2. I tried a shared library version and the behaviour was the
same as above.

Regards,

-- 
Eoin McHugh
ICHEC Systems Team