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Holland Computing Center

Merritt Hardware

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 of 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