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, interconnects and external persistent storage (NDC-Waterloo) will be the similar to Cedar's. There is a slightly different mix of compute nodes and interconnect type.

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 temporary (/scratch) storage. Aggregate performance of 35GB/s. 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

A low-latency high-performance fabric connecting all nodes and temporary 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

"Base" compute nodes	800 nodes	16 cores/socket, 2 sockets/node, 128 GB of memory.
"Bigmem512" 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.
"Large" nodes	56 nodes	16 cores/socket, 2 sockets/node, 256 GB of memory.

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.