Technische Universität München, Fakultät für Informatik
Lehreinheit für Rechnertechnik und Rechnerorganisation / Parallelrechnerarchitektur
Global Virtual Memory based on SCI-DSM
Martin Schulz, Hermann Hellwagner
SCI-Europe '98, Bordeaux, France
, September 1998
Abstract:
The Scalable Coherent Interface (SCI) is an interconnect standard
that extends the convenient services of computer
busses into the realm of parallel systems and compute clusters. Most
importantly, SCI offers a 64-bit physical address space and related
transactions to read, write, and lock addresses or address ranges
therein. The single SCI address space spans multiple "nodes" in a
parallel or distributed system, where the 16 MSBs of an SCI address
identify a node and the 48 LSBs represent an address offset into the
local memory of that node. Nodes may be, e.g., memory modules, PCs,
workstations, or even SMP servers. The hardware-based SCI distributed
shared memory (DSM) may therefore form the basis for large-scale,
shared-memory, NUMA-type parallel platforms. SCI also specifies
optional distributed cache coherence protocols which allows CC-NUMA
machines to be built. The latter approach has been chosen for the
HP/Convex Exemplar, Sequent NUMA-Q, and Data General NUMALiine
systems, for instance.
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