SPEChpc 2021 Benchmarks on Ice Lake and Sapphire Rapids Infiniband Clusters: A Performance and Energy Case Study

Abstract

In this work, fundamental performance, power, and energy characteristics of the full SPEChpc 2021 benchmark suite are assessed on two different clusters based on Intel Ice Lake and Sapphire Rapids CPUs using the MPI-only codes' variants. We use memory bandwidth, data volume, and scalability metrics in order to categorize the benchmarks and pinpoint relevant performance and scalability bottlenecks on the node and cluster levels. Common patterns such as memory bandwidth limitation, dominating communication and synchronization overhead, MPI serialization, superlinear scaling, and alignment issues could be identified, in isolation or in combination, showing that SPEChpc 2021 is representative of many HPC workloads. Power dissipation and energy measurements indicate that the modern Intel server CPUs have such a high idle power level that race-to-idle is the paramount strategy for energy to solution and energy-delay product minimization. On the chip level, only memory-bound code shows a clear advantage of Sapphire Rapids compared to Ice Lake in terms of energy to solution.

arXiv comment9 pages, 6 figures; corrected links to system docs

References in corpus (8)

• LIKWID: Lightweight Performance Tools
• Exploring performance and power properties of modern multicore chips via simple machine models
• Chip-level and multi-node analysis of energy-optimized lattice-Boltzmann CFD simulations
• Propagation and Decay of Injected One-Off Delays on Clusters: A Case Study
• The Role of Idle Waves, Desynchronization, and Bottleneck Evasion in the Performance of Parallel Programs
• Desynchronization and Wave Pattern Formation in MPI-Parallel and Hybrid Memory-Bound Programs
• Analytic Modeling of Idle Waves in Parallel Programs: Communication, Cluster Topology, and Noise Impact
• Exploring Techniques for the Analysis of Spontaneous Asynchronicity in MPI-Parallel Applications