| Merritt |
| Number of processors |
64 |
| Physical memory size (GB) |
512 |
| Memory architecture |
Cache Coherent, Non-Uniform Memory Access (NUMA) |
| Operating system |
SUSE Linux Enterprise 9.1, SGI ProPack 4 |
| Processor type, ISA |
1.3 GHz Intel Itanium-2 u-processors (Madison), IA-64 Little Endian |
| Number pf processors / node |
2 |
| Size of local memory / node |
16 GB |
| Number of nodes and SHUBs / C-brick |
2 (NODE 0, NODE 1) |
| Number of C-bricks |
32 |
| Cache coherence protocol within node |
Itanium-2 snoopy bus |
| Interconnection between nodes for global shared memory |
SGI NUMAlink-3
- Dual-plane, fat-tree topology
- Router-brick (R-brick) with 8x8 cross-bar switch
- 3.2 GB/sec bidirectional bandwidth per link
- 400 MB/sec bandwitch available for each processor
- path length is O(log(N)), N = number of processors; 5 routing hops maximum; 50 nanosecs / router
|
| Global cache coherence protocol |
SGI NUMAflex Directory-based, write-invalidation (cache controllers in SHUBs) |
| Memory-only modules |
Not on Merritt |
| Number of IX-bricks |
1 |
| Base PCI/PCI-X slots |
Per IX-brick
- 5 PCI-X buses (64-bit, 133 MHz), 10 slots available
- 1 64-bit, 66 MHz PCI slot
|
| Networking |
1-Gigabit ethernet external, 1-Gigabit ethernet internal |
| System disks |
Two 36GB disks (1 for each IX-brick) |
| Disk expansion unit |
TP9300 10 Terabyte RAID disk |
