OceanLite (Wuxi)

OceanLite is an exascale supercomputer located in Wuxi, China built on the Sunway SW26010P (or “SW26010-Pro”¹) processors.

System overview

OceanLite has 107,520,² 107,250,³ or 107,136⁴ compute nodes, each with a single SW26010P CPU and a tapered fat tree interconnect.

According to the system specification, it should have $R_{\text{peak}}=1.48\text{ EF FP64}$.⁴ It was used in a Gordon Bell Prize-winning paper² that achieved 1.2 EF FP32 performance.

It is unclear how the nodes and racks are laid out.

Node architecture

Each compute node has:

• 1x SW26010P CPU
  • 2.25 GHz⁴
  • 6x core groups (CGs)
    • 1x memory controller each
    • 16 GB DDR4 at 51.2 GB/s
    • 1x management processing element (MPE)
    • 1x 8x8 computing processing element (CPE) cluster (64 cores), each with a 512-bit vector unit
• 390 cores (“processing elements”)
  • 6 core groups $\times$ 64 PEs per core group = 384 cores
  • 6 core groups $\times$ 1 management PE = 6 cores
  • 384 + 6 = 390 cores total
• 96 GB DDR4 at 307.2 GB/s
• 13.8 TF⁴ or 14.03 TF¹ FP64
• 27.6 TF⁴ or 14.03 TF¹ FP32
• 55.30 TF FP16 and BF16¹

Network architecture

Groups of 256 compute nodes are combined into supernodes that are interconnected as a non-blocking fat tree. These supernodes are connected in a second level fat tree with 16:3 oversubscription.¹

In addition, OceanLite has a second network dedicated to I/O traffic.¹

Footnotes

1. BaGuaLu | Proceedings of the 27th ACM SIGPLAN Symposium on Principles and Practice of Parallel Programming ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶

2. [2110.14502] Closing the “Quantum Supremacy” Gap: Achieving Real-Time Simulation of a Random Quantum Circuit Using a New Sunway Supercomputer ↩ ↩²

3. How China Made An Exascale Supercomputer Out Of Old 14 Nanometer Tech ↩

4. China’s New(ish) SW26010-Pro Supercomputer at SC23 ↩ ↩² ↩³ ↩⁴ ↩⁵