Graham

Graham (GP3)

GRAHAM is a heterogeneous cluster, suitable for a variety of workloads, and located at the University of Waterloo. It is named after Wes Graham, the first director of the Computing Centre at Waterloo. It was previously known as "GP3" and is still identified as such in the 2017 RAC documentation.

The parallel filesystem and external persistent storage (NDC-Waterloo) are similar to Cedar's. The interconnect is different and there is a slightly different mix of compute nodes.

Attached Storage System

$HOME	Standard home directory Small, standard quota Larger requests should be on $PROJECT
$SCRATCH Parallel high-performance filesystem	Approximately 3PB usable capacity for active or temporary (/scratch) storage. Available to all nodes. Not allocated Purged - inactive data will be purged
$PROJECT External persistent storage	Provided by the NDC. Available to compute nodes, but not designed for parallel I/O workloads.

High-performance interconnect

Low-latency high-bandwidth Infiniband fabric connects all nodes and scratch storage.

The design of Graham is to support multiple simultaneous parallel jobs of up to 1024 cores in a fully non-blocking manner.

Node types and characteristics

Processor type: All nodes have Intel E5-2683 V4 CPUs, running at 2.1 GHz

GPU type: P100 12g

"Base" compute nodes	800 nodes	16 cores/socket, 2 sockets/node, 128 GB of memory
"Large" nodes	56 nodes	16 cores/socket, 2 sockets/node, 256 GB of memory.
"Bigmem500" nodes	24 nodes	16 cores/socket, 2 sockets/node, 512 GB of memory.
"Bigmem3000" nodes	3 nodes	16 cores/socket, 4 sockets/node, 3 TB of memory.
"GPU" nodes	160 nodes	16 cores/socket, 2 sockets/node, 128 GB of memory, 2 NVIDIA P100 GPUs.

All of the above nodes will have approximately 1TB of local (on-node) storage provided by SSD drives available in /tmp.

The delivery and installation schedule is not yet confirmed.