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knem ("kernel nemesis")
This is a Linux kernel module that provides high-bandwidth message
transfers on Linux when using the nemesis communication subsystem.  In
order to use MPICH with knem you must build and install knem according
configure MPICH with the following arguments:


Where (:net_mod) indicates an optional network module parameter such as
tcp or mx.  Omitting a netmod will select the default netmod ("tcp" as
of the time of this writing).