Grace: A Dell x86 HPC Cluster
|Operating System:||Linux (CentOS 7)|
|Total Compute Cores/Nodes:||44,656 cores|
|Compute Nodes:||800 48-core compute nodes, each with 384GB RAM |
100 48-core GPU nodes, each with two A100 40GB GPUs and 384GB RAM
9 48-core GPU nodes, each with two RTX 6000 24GB GPUs and 384GB RAM
8 48-core GPU nodes, each with 4 T4 16GB GPUs
8 80-core large memory nodes, each with 3TB RAM
|Interconnect:||Mellanox HDR 100 InfiniBand|
|Peak Performance:||6.2 PFLOPS|
|Global Disk:||5PB (usable) via DDN Lustre appliances for general use |
1.4PB (usable) via Lenovo DSS GPFS appliance (purchased by and dedicated for Dr. Junjie Zhang's CryoEM Lab)
1.9PB (usable) via Lenovo DSS GPFS appliance (purchased by and dedicated for Dr. Ping Chang's iHESP Lab)
|File System:||Lustre and GPFS|
|Batch Facility:||Slurm by SchedMD|
|Location:||West Campus Data Center|
|Production Date:||Spring 2021|
Grace is an Intel x86-64 Linux cluster with 925 compute nodes (44,656 total cores) and 5 login nodes. There are 800 compute nodes with 384 GB of memory, and 117 GPU nodes with 384 GB of memory. Among the 117 GPU nodes, there are 100 GPU nodes two A100 40 GB GPU cards, 9 GPU nodes with two RTX 6000 24GB GPU cards, 8 GPU nodes with four T4 16GB GPU cards. These 800 compute nodes and 117 GPU nodes are a dual socket server with two Intel 6248R 3.0GHz 24-core processors, commonly known as Cascade Lake. There are 8 compute nodes with 3 TB of memory and four Intel 6248 2.5 GHz 20-core processors.
The interconnecting fabric is a two-level fat-tree based on HDR 100 InfiniBand.
High performance mass storage of 5 petabyte (usable) capacity is made available to all nodes by the DDN Lustre storage. Also, 3.3 PB of Lenovo DSS GPFS storage is for their respective research labs.
Get details on using this system, see the User Guide for Grace.
A description of the four types of compute nodes is below:
|GPU RTX 6000
|Large Memory 3TB|
|Processor Type||Intel Xeon 6248R (Cascade Lake), 3.0GHz, 24-core||Intel Xeon 6248 (Cascade Lake), 2.5 GHz, 20-core|
|Memory/Node||384GB DDR4, 3200 MHz||3TB DDR4, 3200 MHz|
|Accelerator(s)||N/A||2 NVIDIA A100 40GB GPU||2 NVIDIA RTX 6000 24GB GPU||4 NVIDIA T4 16GB GPU||N/A|
|Interconnect||Mellanox HDR100 InfiniBand|
|Local Disk Space||1.6TB NVMe (/tmp), 480GB SSD|
Usable Memory for Batch Jobs
While nodes on Grace have either 384GB or 3TB of RAM, some of this memory is used to maintain the software and operating system of the node. In most cases, excessive memory requests will be automatically rejected by SLURM.
The table below contains information regarding the approximate limits of Grace memory hardware and our suggestions on its use.
|384GB Nodes (Regular and GPU)||3TB Nodes|
|Number of Cores||48 Cores||80 Cores|
|37120 MB |
|2969600 MB |
The grace.hprc.tamu.edu hostname can be used to access the Grace cluster. This translates into one of the five login nodes, grace[1-5].hprc.tamu.edu. To access a specific login node use its corresponding host name (e.g., grace2.hprc.tamu.edu). All login nodes have 10 GbE connections to the TAMU campus network and direct access to all global parallel (Lustre-based) file systems. The table below provides more details about the hardware configuration of the login nodes.
|NVIDIA A100 GPU||NVIDIA RTX 6000 GPU||NVIDIA T4 GPU||No GPU|
|Processor Type||Intel Xeon 6248R 3.0GHz 24-core|
|Memory||384GB DDR4 3200 MHz|
|Interconnect||Mellanox HDR 100 InfiniBand|
|Local Disk Space||per node: two 480 GB SSD drives, 1.6 TB NVMe|
- 5PB (usable) with Lustre provided by DDN ES200NV appliance and two ES7990X appliances
- 1.4PB (usable) with GPFS provided by Lenovo's DSS-G220 appliance
- 1.9PB (usable) with GPFS provided by Lenovo's DSS-G230 appliance
Two level fat tree topology with Mellanox HDR100:
- There are 5 core switches and 11 leaf switches.
- Each leaf switch has 2 Mellanox HDR InfiniBand (200Gb/s) uplinks to each core switch.
- There are up to 80 compute nodes attached to each leaf switch.
- Each login or compute node has a single Mellanox HDR100 InfiniBand (100Gb/s) link to a leaf switch.
- The DDN storage has 12 total HDR100 links.
- The Lenovo DSS-G220 storage (Dr. Junjie Zhang's CryoEM Lab) has 8 HDR100 links.
- The Lenovo DSS-G230 storage (Dr. Ping Chang's iHESP Lab) has 8 EDR links (100Gb/s).
"Grace" is named for Grace Hopper.