Otus Supercomputer

TL;DR

Otus is a high-performance supercomputer launched in 2025, offering doubled computing power over its predecessor, with diverse node types, and achieving top rankings in energy efficiency and performance.

Contribution

The paper provides a comprehensive overview of Otus' hardware, software, system integration, and energy-efficient operation, highlighting its advancements and operational insights.

Findings

Otus ranks 164th on Top500 with CPU and 255th with GPU.

Otus is 5th on Green500 for energy efficiency.

Otus offers twice the computing power of Noctua 2.

Abstract

Otus is a high-performance computing cluster that was launched in 2025 and is operated by the Paderborn Center for Parallel Computing (PC2) at Paderborn University in Germany. The system is part of the National High Performance Computing (NHR) initiative. Otus complements the previous supercomputer Noctua 2, offering approximately twice the computing power while retaining the three node types that were characteristic of Noctua 2: 1) CPU compute nodes with different memory capacities, 2) high-end GPU nodes, and 3) HPC-grade FPGA nodes. On the Top500 list, which ranks the 500 most powerful supercomputers in the world, Otus is in position 164 with the CPU partition and in position 255 with the GPU partition (June 2025). On the Green500 list, ranking the 500 most energy-efficient supercomputers in the world, Otus is in position 5 with the GPU partition (June 2025). This article provides a comprehensive overview of the system in terms of its hardware, software, system integration, and its overall integration into the data center building to ensure energy-efficient operation. The article aims to provide unique insights for scientists using the system and for other centers operating HPC clusters. The article will be continuously updated to reflect the latest system setup and measurements.