OMB-Py: Python Micro-Benchmarks for Evaluating Performance of MPI Libraries on HPC Systems

• URL: http://arxiv.org/abs/2110.10659v1
• Date: Wed, 20 Oct 2021 16:59:14 GMT
• Title: OMB-Py: Python Micro-Benchmarks for Evaluating Performance of MPI Libraries on HPC Systems
• Authors: Nawras Alnaasan, Arpan Jain, Aamir Shafi, Hari Subramoni, and Dhabaleswar K Panda
• Abstract summary: OMB-Py is the first communication benchmark suite for parallel Python applications. OMB-Py consists of a variety of point-to-point and collective communication benchmark tests. We report up to 106x speedup on 224 CPU cores compared to sequential execution.
• Score: 1.066106854070245
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Python has become a dominant programming language for emerging areas like Machine Learning (ML), Deep Learning (DL), and Data Science (DS). An attractive feature of Python is that it provides easy-to-use programming interface while allowing library developers to enhance performance of their applications by harnessing the computing power offered by High Performance Computing (HPC) platforms. Efficient communication is key to scaling applications on parallel systems, which is typically enabled by the Message Passing Interface (MPI) standard and compliant libraries on HPC hardware. mpi4py is a Python-based communication library that provides an MPI-like interface for Python applications allowing application developers to utilize parallel processing elements including GPUs. However, there is currently no benchmark suite to evaluate communication performance of mpi4py -- and Python MPI codes in general -- on modern HPC systems. In order to bridge this gap, we propose OMB-Py -- Python extensions to the open-source OSU Micro-Benchmark (OMB) suite -- aimed to evaluate communication performance of MPI-based parallel applications in Python. To the best of our knowledge, OMB-Py is the first communication benchmark suite for parallel Python applications. OMB-Py consists of a variety of point-to-point and collective communication benchmark tests that are implemented for a range of popular Python libraries including NumPy, CuPy, Numba, and PyCUDA. We also provide Python implementation for several distributed ML algorithms as benchmarks to understand the potential gain in performance for ML/DL workloads. Our evaluation reveals that mpi4py introduces a small overhead when compared to native MPI libraries. We also evaluate the ML/DL workloads and report up to 106x speedup on 224 CPU cores compared to sequential execution. We plan to publicly release OMB-Py to benefit Python HPC community.

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