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Compaq AlphaServer SC Interconnect
Terms
A.1 Introduction
RMS includes support for programs that use Compaq AlphaServer SC Interconnect. This
appendix provides an introduction to Compaq AlphaServer SC Interconnect, defining
terms used elsewhere in this manual.
Before an application process can use Compaq AlphaServer SC Interconnect, it must be
given an Elan capability (see Section C.2), describing the nodes and communications
contexts that it is allowed to use. In general, processes present this capability to the
kernel as they start.
Having granted a request for CPUs, RMS generates an appropriate capability and pushes
it into the RMS kernel module on each of the allocated nodes. The capabilities together
with information on the processes that make up the program can then be accessed
through the librmscall system call library (see Section C.3 for details).
Compaq AlphaServer SC Interconnect is a multistage switch network, also known as a
fat tree network. It is built from 8-way crosspoint switches, known as Elites. Each node is
connected to the network by a network adapter, the Elan. The connection of a 2-stage
(16-node) switch network is shown in Figure A.1.
Compaq AlphaServer SC Interconnect Terms A-1