Fermat (Origin 2000)
The SGI
Origin 2000 machine has been named Fermat in honour of the French mathematician
Pierre de Fermat (1601-1655).
Overview
| The system has 128 MIPS
processors, each clocked at 400 MHz
and each capable of a peak performance of 800 Megaflops. The machine
uses SGI's NUMAlink interconnect to provide very low latency, high
bandwidth communication between the processors and the 128 Gigabytes
of globally shared memory. The memory subsystem and interconnect
are not as powerful as those on the Origin 3800 machine. The system
has some local disk for temporary storage as well as access to the
storage area network (SAN). 118 processors and 118 Gigabytes of
memory are available to applications, and this resource can all
be used for a single job. Note that Fermat is a batch only system
and all jobs must be submitted from Wren, the Origin 300 machine. |
 |
Specifications
| Aspect of the system |
Details |
| Processors |
128 x 400 MHz MIPS R12000 processors |
| Memory |
128 GBytes memory |
| Cache hierarchy |
Each processor has 8MB Level
2 cache, 32 KB Level 1 data
cache, 32 KB Level 1 instruction cache |
| Interconnect |
SGI NUMAlink providing sub-microsecond hardware latency, 8 microseconds
MPI latency. |
| Operating System |
IRIX |
| Partitioning |
This machine is a 128 processor single system image (SSI) |
| Maximum job size |
118 processors can be used for a single run |
| Theoretical peak performance |
100 Gigaflops - 128 processors x theoretical peak of 800 Megaflops |
| Host Address |
fermat.cfs.ac.uk |
Configuration Information
Fermat is configured with 2 processors set aside for
operating system tasks, 6 processors for interactive access for system
administrators and other monitoring tasks by the application support
team, and the remaining 118 processors available for batch work. There
is no facility for direct interactive access to this machine.
Fermat is visible to the outside world as fermat.cfs.ac.uk
and therefore it is possible to make use of applications which use the
X windowing system provided that the DISPLAY environment variable is
set to the appropriate value in your batch submission script and you
have allowed access to your local machine (i.e. your local firewall
allows incoming X traffic and you have used the xhost command to give
access permissions to fermat).
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