Lassen
Lassen

Lassen is similar to the classified Sierra system, but smaller in size:  23 petaflops peak performance vs. Sierra's 125 petaflops peak performance. Lassen was ranked #10 on the June 2019 Top500 list.

*Login nodes: lassen[708-709]
NOTE: most numbers are for compute nodes only - not login or service nodes.

Zone
CZ
Vendor
IBM
User-Available Nodes
Login Nodes*
2
Batch Nodes
756
Total Nodes
795
CPUs
CPU Architecture
IBM Power9
Cores/Node
44
Total Cores
34,848
GPUs
GPU Architecture
NVIDIA V100 (Volta)
Total GPUs
792
GPU peak performance (TFLOP/s double precision)
7.00
Memory Total (GB)
253,440
CPU Memory/Node (GB)
256
Peak Performance
Peak TFLOPS (CPUs)
855.0
Peak TFLOPs (GPUs)
22,192.2
Peak TFLOPS (CPUs+GPUs)
23,047.20
Clock Speed (GHz)
3.5
Peak single CPU memory bandwidth (GB/s)
170
OS
RHEL
Interconnect
IB EDR
Recommended location for parallel file space
Program
ASC+M&IC
Year Commissioned
2018
Compilers
Documentation