Release Themes for 2024

[ajpowelsnl]

In response to a KUG23 request, here's a list of 2024 themes, and associated PR. This info will be presented at each release demo to help situate the user community in Kokkos efforts.

Performance

API self-consistency

• Make hierarchical and top-level parallelism more self-consistent

Unified Memory Support (NVIDIA Grace Hopper, AMD MI300)

• Supporting GPU-based architectures where memory is universally performant accessible
• Avoid unnecessary memory duplications in mirror view-based schemes
• Grace/Hopper -> enable CPU access to GPU HBM memory
• AMD MI300A -> single physical memory
• POC: @crtrott

Multi-GPU support

• Support multiple devices per process in addition to multiple instances per device
• In particular targeted at supporting task-based systems such as Legion, Uintah, and HPX
• POC: @masterleinad @tcclevenger

MDSpan Integration

• Interoperability of View with mdspan
  • conversion operator & constructor
• replace implementation details of View with mdspan
• POC: @nmm0

SIMD Improvements

• Further alignment with ISO C++ standard proposal
• Support for more architectures (e.g. ARM SVE)
• More flexibility in logical vector length
• POC: @ldh4

Algorithms

• Need feedback and usage experience to mature std algorithms
• Training material
• Special focus on sorting algorithms to address more use cases