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On 25/03/12 17:43, Brice Goglin wrote:
> But it'd be good to understand what's going on in /sys on this
> machine. And I still don't understand why MPI changes things here.
My guess (looking at the BG/P CNK kernel code) is that /sys is not
present on a BG/Q compute node, only on its I/O nodes (which run a
Linux kernel), and so the code is only picking them up when the I/O is
being redirected via an I/O node (i.e. when MPI is in play).
Now I'd have thought that would happen with or without MPI, but who
Christopher Samuel - Senior Systems Administrator
VLSCI - Victorian Life Sciences Computation Initiative
Email: samuel_at_[hidden] Phone: +61 (0)3 903 55545
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