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The Convex Exemplar SPP-1200.

Machine type: RISC-based distributed-memory multi-processor.
Models: SPP-1200.
Operating system: SPP-UX, based on OSF/1 AD microkernel.
Connection structure: Ring.
Compilers: Fortran, C.

System parameters:




Note: The tex2html_wrap_inline253 and tex2html_wrap_inline251 values as given above stem from an 32 processor system (4 hypernodes, see below).

The SPP-1200 is the successor of the SPP-1000 and structurally there are no differences with this machine. The system can be seen as a logical next step of integration after the Meta Series clusters of Convex. Where the latter is a cluster of workstations that still uses external interconnection channels like Ethernet or FDDI, the SPP-1200 has its communication structure integrated. As in the Meta Series the CPUs used are HP's PA-RISC processors. Up to 8 of those can be placed in what is called a hypernode by Convex. A maximal system consists of 16 nodes, i.e., 128

Within each hypernode up to 2GB of memory can be accommodated which can be reached by the local processors via a crossbar with an aggregate bandwidth of 16 GB/s. The hypernodes in turn are connected to each other by a crossbar with an aggregate bandwidth of 4 GB/s. So, the system concept is somewhat hybrid: within a hypernode the machine is effectively a shared-memory system, while between hypernodes it is a distributed memory system. Each node supports local I/O, while external global I/O can be done at an aggregate rate of 4 GB/s.

The Exemplar programming environment complements the SPP-1200 at the software side. This environment includes a message passing programming model (PVM) and a virtual shared memory model which allows the user to have shared-memory view of the system.
Tue May 28 14:38:25 PST 1996