TL;DR
This paper presents mdspan, a new C++ standard multidimensional array view inspired by HPC performance portability efforts, addressing language limitations and enabling efficient heterogeneous computing.
Contribution
It introduces the final design and implementation of mdspan, integrating performance-portable features into C++23 after a five-year consensus process.
Findings
Demonstrates zero-overhead performance of mdspan implementation
Addresses core challenges of performance-portable programming
Provides a seamless extension for heterogeneous systems
Abstract
Multi-dimensional arrays are ubiquitous in high-performance computing (HPC), but their absence from the C++ language standard is a long-standing and well-known limitation of their use for HPC. This paper describes the design and implementation of mdspan, a proposed C++ standard multidimensional array view (planned for inclusion in C++23). The proposal is largely inspired by work done in the Kokkos project---a C++ performance-portable programming model deployed by numerous HPC institutions to prepare their code base for exascale-class supercomputing systems. This paper describes the final design of mdspan after a five-year process to achieve consensus in the C++ community. In particular, we will lay out how the design addresses some of the core challenges of performance-portable programming, and how its customization points allow a seamless extension into areas not currently addressed by…
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