We need specific BGQ binding support, the binding API is different. Also
we don't properly detect the 16 4-way cores properly, we only only 64
I am supposed to get a BGQ account in the near future so I hope I will
have everything working in v1.7.
Le 08/01/2013 18:06, Erik Schnetter a écrit :
> I am trying to use hwloc on a Blue Gene/Q. Building and installing
> worked fine, and it reports the system configuration fine as well
> (i.e. it shows all PUs). However, when I try to inquire the
> thread/core bindings, hwloc crashes with an error in libc's free().
> This is both with 1.6 and 1.6.1rc1.
> The error occurs apparently in CPU_FREE called from
> Does this ring a bell with anyone? I know this is not enough
> information to debug things, but do you have any pointers for things
> to look at?
> I remember reading somewhere that the last bit in a cpu_set_t cannot
> be used. A Blue Gene/Q has 64 PUs, and may be using 64-bit integers to
> hold cpu_set_t data. Could this be an issue?
> My goal is to examine and experiment with thread/core bindings with
> OpenMP to improve performance.
> Erik Schnetter <schnetter_at_[hidden] <mailto:schnetter_at_[hidden]>>
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