compute-nodes.md

Compute Nodes

Node Configuration

Anselm is a cluster of x86-64 Intel-based nodes built with the Bull Extreme Computing bullx technology. The cluster contains four types of compute nodes.

Compute Nodes Without Accelerators

• 180 nodes
• 2880 cores in total
• two Intel Sandy Bridge E5-2665, 8-core, 2.4GHz processors per node
• 64 GB of physical memory per node
• one 500GB SATA 2,5” 7,2 krpm HDD per node
• bullx B510 blade servers
• cn[1-180]

Compute Nodes With a GPU Accelerator

• 23 nodes
• 368 cores in total
• two Intel Sandy Bridge E5-2470, 8-core, 2.3GHz processors per node
• 96 GB of physical memory per node
• one 500GB SATA 2,5” 7,2 krpm HDD per node
• GPU accelerator 1x NVIDIA Tesla Kepler K20m per node
• bullx B515 blade servers
• cn[181-203]

Compute Nodes With a MIC Accelerator

• 4 nodes
• 64 cores in total
• two Intel Sandy Bridge E5-2470, 8-core, 2.3GHz processors per node
• 96 GB of physical memory per node
• one 500GB SATA 2,5” 7,2 krpm HDD per node
• MIC accelerator 1x Intel Phi 5110P per node
• bullx B515 blade servers
• cn[204-207]

Fat Compute Nodes

• 2 nodes
• 32 cores in total
• 2 Intel Sandy Bridge E5-2665, 8-core, 2.4GHz processors per node
• 512 GB of physical memory per node
• two 300GB SAS 3,5” 15krpm HDD (RAID1) per node
• two 100GB SLC SSD per node
• bullx R423-E3 servers
• cn[208-209]

Anselm bullx B510 servers

Compute Node Summary

Node type	Count	Range	Memory	Cores	Queues
Nodes without an accelerator	180	cn[1-180]	64GB	16 @ 2.4GHz	qexp, qprod, qlong, qfree, qprace, qatlas
Nodes with a GPU accelerator	23	cn[181-203]	96GB	16 @ 2.3GHz	qnvidia, qexp
Nodes with a MIC accelerator	4	cn[204-207]	96GB	16 @ 2.3GHz	qmic, qexp
Fat compute nodes	2	cn[208-209]	512GB	16 @ 2.4GHz	qfat, qexp

Processor Architecture

Anselm is equipped with Intel Sandy Bridge processors Intel Xeon E5-2665 (nodes without accelerators and fat nodes) and Intel Xeon E5-2470 (nodes with accelerators). The processors support Advanced Vector Extensions (AVX) 256-bit instruction set.

Intel Sandy Bridge E5-2665 Processor

• eight-core
• speed: 2.4 GHz, up to 3.1 GHz using Turbo Boost Technology
• peak performance: 19.2 GFLOP/s per core
• caches:
  • L2: 256 KB per core
  • L3: 20 MB per processor
• memory bandwidth at the level of the processor: 51.2 GB/s

Intel Sandy Bridge E5-2470 Processor

• eight-core
• speed: 2.3 GHz, up to 3.1 GHz using Turbo Boost Technology
• peak performance: 18.4 GFLOP/s per core
• caches:
  • L2: 256 KB per core
  • L3: 20 MB per processor
• memory bandwidth at the level of the processor: 38.4 GB/s

Nodes equipped with Intel Xeon E5-2665 CPU have a set PBS resource attribute cpu_freq = 24, nodes equipped with Intel Xeon E5-2470 CPU have set PBS resource attribute cpu_freq = 23.

$ qsub -A OPEN-0-0 -q qprod -l select=4:ncpus=16:cpu_freq=24 -I

In this example, we allocate 4 nodes, 16 cores at 2.4GHhz per node.

Intel Turbo Boost Technology is used by default, you can disable it for all nodes of job by using the cpu_turbo_boost resource attribute.

$ qsub -A OPEN-0-0 -q qprod -l select=4:ncpus=16 -l cpu_turbo_boost=0 -I

Memmory Architecture

The cluster contains three types of compute nodes.

Compute Nodes Without Accelerators

• 2 sockets
• Memory Controllers are integrated into processors.
  • 8 DDR3 DIMMs per node
  • 4 DDR3 DIMMs per CPU
  • 1 DDR3 DIMMs per channel
  • Data rate support: up to 1600MT/s
• Populated memory: 8 x 8 GB DDR3 DIMM 1600 MHz

Compute Nodes With a GPU or MIC Accelerator

• 2 sockets
• Memory Controllers are integrated into processors.
  • 6 DDR3 DIMMs per node
  • 3 DDR3 DIMMs per CPU
  • 1 DDR3 DIMMs per channel
  • Data rate support: up to 1600MT/s
• Populated memory: 6 x 16 GB DDR3 DIMM 1600 MHz

Fat Compute Nodes

• 2 sockets
• Memory Controllers are integrated into processors.
  • 16 DDR3 DIMMs per node
  • 8 DDR3 DIMMs per CPU
  • 2 DDR3 DIMMs per channel
  • Data rate support: up to 1600MT/s
• Populated memory: 16 x 32 GB DDR3 DIMM 1600 MHz