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.

Zone
CZ
Vendor
IBM
CPU Clock Speed (GHz)
3.5
Nodes
Login Nodes*
Batch Nodes
756
GPU nodes
792
Total Nodes
795
CPUs
CPU Architecture
IBM Power9
Cores/Node
44
Total Cores
34,848
GPUs
GPU Architecture
NVIDIA V100 (Volta)
Total GPUs
2,664
GPUs per compute node
4
GPU peak performance (TFLOP/s double precision)
7.00
Memory
Memory Total (GB)
253,440
CPU Memory/Node (GB)
256
GPU Memory/Node (GB)
64
Peak single CPU memory bandwidth (GB/s)
170
Peak Performance
Peak TFLOPS (CPUs)
855
Peak TFLOPs (GPUs)
22,192
Peak TFLOPS (CPUs+GPUs)
23,047
OS
RHEL
Interconnect
IB EDR
Program
ASC+M&IC
Year Commissioned
2018
Compilers
Documentation

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