Casper

Logging in | Hardware

The Casper cluster is a heterogeneous system of specialized data analysis and visualization resources; large-memory, multi-GPU nodes; and high-throughput computing nodes.

Three photos of the Casper cluster of nodes.

Casper is composed of 100 nodes featuring Intel Skylake or Cascade Lake processors.

  • 22 Supermicro SuperWorkstation nodes are used for data analysis and visualization jobs. Each node has 36 cores and up to 384 GB memory.
  • 10 nodes feature large-memory, dense GPU configurations to support explorations in machine learning (ML) and deep learning (DL) and general-purpose GPU (GPGPU) computing in atmospheric and related sciences.
  • 64 high-throughput computing (HTC) nodes for small computing tasks using 1 or 2 CPUs.
    • 62 HTC nodes have 384 GB of available memory
    • 2 HTC nodes have 1.5 TB of available memory
  • 4 nodes are reserved for Research Data Archive workflows.

See the hardware summary table below for detailed specifications.

Operating system: CentOS 7.8


Logging in

To log in, start your terminal or Secure Shell client and run an ssh command as shown here:

ssh -X username@cheyenne.ucar.edu 
OR 
ssh -X username@casper.ucar.edu

Some users (particularly on Macs) need to use -Y instead of -X when calling SSH to enable X11 forwarding.

You can use this shorter command if your username for the system is the same as your username on your local computer:

ssh -X cheyenne.ucar.edu 
OR 
ssh -X casper.ucar.edu

After running the ssh command, you will be asked to authenticate to finish logging in.


Hardware

Data Analysis
& Visualization nodes

22 Supermicro 7049GP-TRT SuperWorkstation nodes
Up to 384 GB DDR4-2666 memory per node
2 18-core 2.3-GHz Intel Xeon Gold 6140 (Skylake) processors per node
2 TB local NVMe Solid State Disk
1 Mellanox ConnectX-4 100Gb Ethernet connection (GLADE, Campaign Storage, external connectivity)
1 Mellanox ConnectX-6 HDR100 InfiniBand link
1 NVIDIA Quadro GP100 GPU 16GB PCIe on each of 9 nodes

Machine Learning/Deep Learning 
& General Purpose GPU (GPGPU) nodes

4 Supermicro SuperServer nodes with 4 V100 GPUs
768 GB DDR4-2666 memory per node
2 18-core 2.3-GHz Intel Xeon Gold 6140 (Skylake) processors per node
2 18-core 2.6-GHz Intel Xeon Gold 6240 (Cascade Lake) processors per node
2 TB local NVMe Solid State Disk
1 Mellanox ConnectX-4 100Gb Ethernet connection (GLADE, Campaign Storage, external connectivity)
2 Mellanox ConnectX-6 HDR200 InfiniBand adapters. HDR100 link on each CPU socket
4 NVIDIA Tesla V100 32GB SXM2 GPUs with NVLink

6 Supermicro SuperServer nodes with 8 V100 GPUs
1152 GB DDR4-2666 memory per node
2 18-core 2.3-GHz Intel Xeon Gold 6140 (Skylake) processors per node
2 TB local NVMe Solid State Disk
1 Mellanox ConnectX-4 100Gb Ethernet connection (GLADE, Campaign Storage, external connectivity)
2 Mellanox ConnectX-6 HDR200 InfiniBand adapters, HDR100 link on each CPU socket
8 NVIDIA Tesla V100 32GB SXM2 GPUs with NVLink

High-Throughput Computing nodes

62 small-memory workstation nodes
394 GB DDR4-2666 memory per node 
2 18-core 2.6-GHz Intel Xeon Gold 6240 (Cascade Lake) processors per node
1.6 TB local NVMe Solid State Disk
1 Mellanox ConnectX-5 100Gb Ethernet VPI adapter (GLADE, Campaign Storage, external connectivity)
1 Mellanox ConnectX-6 HDR200 InfiniBand VPI adapter. HDR100 link on each CPU socket

2 large-memory workstation nodes
1.5 TB DDR4-2666 memory per node 
2 18-core 2.3-GHz Intel Xeon Gold 6240 (Cascade Lake) processors per node
1.6 TB local NVMe Solid State Disk
1 Mellanox ConnectX-5 100Gb Ethernet VPI adapter (GLADE, Campaign Storage, external connectivity)
1 Mellanox ConnectX-6 HDR200 InfiniBand VPI adapter, HDR100 link on each CPU socket

Research Data Archive
nodes (reserved for
RDA use)

4 Supermicro Workstation nodes
94 GB DDR4-2666 memory per node
2 16-core 2.3-GHz Intel Xeon Gold 5218 (Cascade Lake) processors per node
1.92 TB local Solid State Disk
1 Mellanox ConnectX-6 VPI 100Gb Ethernet connection (GLADE, Campaign Storage, internal connectivity)