The Exemplar is a NUMA machine with 64 GBytes of main memory, shared amongst all
256 processors. It runs the SPP-UX Unix operating system, which is binary
compatible with HP-UX. The processors are interconnected using a CTI toroidal
wiring system, which gives excellent low-latency internode communication. Two
HiPPI switches also connect the nodes. There is over 1 TeraByte of disk attached
to the system, which can achieve up to 1 GigaByte/sec parallel reads and writes.
Fast Ethernet and ATM connections are available. The machine is located at, and
operated by, the Caltech Centre for Advanced Computing Research (CACR). Funding
for the machine is by a joint Caltech/JPL/NASA project, not related to GIOD.
We are also using several Pentium-class PCs running Windows/NT, and a couple of
HP model 755 workstations. An HP model C200 workstation equipped with 155 Mbit/sec
ATM has been installed, and this is directly fibre-attached (via a FORE ATM switch)
to the Exemplar.
The CACR HPSS installation has recently been upgraded.
The Objectivity/DB ODBMS is licensed for the Exemplar and workstations being
used in the project. It is a pure object database that includes C++ and Java
bindings, federations of individual databases, and the possibility of wide area
database replication. We have also installed the Versant ODBMS, and have
compared its functionality and inter-ODBMS migration issues.
The Exemplar, HPSS and workstation systems are interconnected on the LAN using
standard Ethernet and/or with HiPPI. Wide area connections between these
systems and CERN (over a 4 Mbit/sec trans-Atlantic link) are being used in tests
of distributed database "federations".
A "CENIC" OC12 link between CACR and the San Diego Supercomputer
Centre (SDSC) will be used for WAN database tests between the Exemplar
and a large peer system in San Diego.In addition, CACR will avail itself of
Internet 2/NGI national connections and peering with ESNET in 1999.