kokkos/kokkos.github.io

Source code for kokkos.org pages

Kokkos: Core Libraries

Kokkos Core implements a programming model in C++ for writing performance portable applications targeting all major HPC platforms. For that purpose it provides abstractions for both parallel execution of code and data management. Kokkos is designed to target complex node architectures with N-level memory hierarchies and multiple types of execution resources. It currently can use CUDA, HIP, SYCL, HPX, OpenMP and C++ threads as backend programming models with several other backends in development.

Kokkos Core is part of the Kokkos C++ Performance Portability Programming Ecosystem.

Kokkos is a Linux Foundation project.

Learning about Kokkos

To start learning about Kokkos:

• Kokkos Lectures: they contain a mix of lecture videos and hands-on exercises covering all the important capabilities.

• Programming guide: contains in "narrative" form a technical description of the programming model, machine model, and the main building blocks like the Views and parallel dispatch.

• API reference: organized by category, i.e., core, algorithms and containers or, if you prefer, in alphabetical order.

• Use cases and Examples: a serie of examples ranging from how to use Kokkos with MPI to Fortran interoperability.

Obtaining Kokkos

The latest release of Kokkos can be obtained from the GitHub releases page.

The current release is 4.3.01.

curl -OJ -L https://github.com/kokkos/kokkos/archive/refs/tags/4.3.01.tar.gz
# Or with wget
wget https://github.com/kokkos/kokkos/archive/refs/tags/4.3.01.tar.gz

To clone the latest development version of Kokkos from GitHub:

git clone -b develop  https://github.com/kokkos/kokkos.git

Building Kokkos

To build Kokkos, you will need to have a C++ compiler that supports C++17 or later. All requirements including minimum and primary tested compiler versions can be found here.

Building and installation instructions are described here.

You can also install Kokkos using Spack: spack install kokkos. Available configuration options can be displayed using spack info kokkos.

For the complete documentation: kokkos.org/kokkos-core-wiki/

Support

For questions find us on Slack: https://kokkosteam.slack.com or open a GitHub issue.

For non-public questions send an email to: crtrott(at)sandia.gov

Contributing

Please see this page for details on how to contribute.

Citing Kokkos

Please see the following page.

License

Under the terms of Contract DE-NA0003525 with NTESS, the U.S. Government retains certain rights in this software.

The full license statement used in all headers is available here or here.

kokkos.github.io's Issues

ADIOS2 Kokkos Interoperability

Lunch Break

FFT Interface for Kokkos

Porting Eulerian Multiphysics Solver xRAGE to GPU-Capable C++

Welcome

Kokkos Kernels - Overview

Authors: @kokkos/kokkoskernels
Presenter: @lucbv

Abstract:
KokkosKernels provides math kernels for dense and sparse linear algebra as well as graph computations. It has multiple aims:

• Provide a portable Kokkos bases interface to BLAS, Sparse and Graph kernels for all major HPC platforms.
• Provide generic implementations of Kernels working with various scalar types and data layouts, going beyond standard types supported by vendor libraries.
• Provide access to major vendor optimized math libraries.
• Provide improved performance for kernels where vendor libraries were historically lacking.

An overview of the library capabilities as well as the latest developments will be presented in this talk.

Lunch Break

Move acknowledgments to the bottom of the page

I am tempted to suggest to even move it to a separate page under "about".
Otherwise I think it would be better to move it to the bottom of the page.
@crtrott any opinion on this.

Kokkos Core/Kernels: State on Exascale Architectures

Kokkos support in the TAU and APEX performance measurement tools

TAU is a full-featured profiler/tracer that provides support for most parallel programming models and platforms, with Kokkos support enabled by default. APEX is a measurement library designed for asynchronous tasking runtimes that provides support for Kokkos and all available back ends, including HPX, and also provides auto-tuning support for Kokkos Team and MDRange execution policies.

LAMMPS and SPARTA: Performance Portability Through Kokkos

A Performance Portability Study Using Tensor Contraction Benchmarks

Using Kokkos in Template Task Graphs

Afternoon Break

CExA project: GPU computing at CEA with Kokkos

The CExA project has been launched by the CEA to
fund a 10 people team to contribute to the Kokkos library and its ecosystem,
to onboard codes developed at CEA, and to offer support, training and
contribute do dissemination inside CEA, in France, Europe and beyond. This
talk will briefly present the project and the first application demonstrators
that have been selected.

Kokkos Core: std::algorithms

Lunch Break

SPECFEM++: Modular implementation of spectral element method

Update links for Programming Guide

https://kokkos.org/programming-guide/ is still pointing to the Kokkos Wiki we just deleted. We should point to the respective pages at https://kokkos.github.io/kokkos-core-wiki/ instead.

Alegra/NG

ArborX, a performance portable geometric search library

Kokkos Community post ECP

Dummy2

Benchmarking portable staggered fermion kernel written in Kokkos and MPI

Memory Management and Profiling with Kokkos: A Trilinos Case Study

KUG23 Abstract to follow... Basically this talk will focus on (a) the Tpetra WrappedDualView and why we settled on that model as a user convenience layer and (b) what we've done with Kokkos profiling to identify extraneous H2D/D2H transfers in Trilinos.

Cabana: Building on Kokkos for Particles

Experiences with Kokkos sorting

Kokkos Core: SIMD

Morning Break

Moving Least Squares Interpolation in ArborX

DDC, a performance portable library abstracting Computation on Discrete Domains

The Discrete Domain Computation library is a modern C++ library that aims to offer to the C++/MPI world an equivalent to the xarray.DataArray/dask.Array python environment. Based on Kokkos, DDC supports zero-overhead dimension labelling for multi-dimensional arrays and performance-portable multi-dimensional algorithms.

MEUMAPPS C++: An Open-Source Framework for Phase-Field Modeling

I will give an overview of MEUMAPPS C++, an open-source framework for solving PDEs using the Fourier pseudospectral method that combines Kokkos with heFFTe (performance portable FFTs) and Sundials (performance portable time integration). I'll discuss strategies for interfacing Kokkos with these libraries as well as performance results on OLCF's Summit and Frontier systems. Finally, I will provide a brief overview of the new use of Kokkos in the deal.II finite element library in the context of adamantine, an open-source thermomechanics code for additive manufacturing.

Lunch Break

General Coordinate (QED)(GR)PIC Code Entity

Profiling the performance of Albany Land-Ice on Perlmutter and Frontier

Albany Land-Ice is an ice sheet model for Earth system modelling that utilizes Kokkos and performance portable Trilinos packages to enable ice sheet simulation on GPU hardware. As part of our ongoing work to achieve high performance on the variety of GPU architectures currently available, we will present our preliminary performance profiling of Albany Land-Ice on Perlmutter and Frontier. Additionally, we will discuss some of the ongoing challenges with achieving optimal performance of Albany Land-Ice on GPUs.

Morning Break

Porting A Fortran-Native Numerical Weather Prediction Parameterization Scheme to GPUs using Kokkos and the Fortran Language Compatibility Layer

Kokkos - Overview

Morning Break

Afternoon Break

Aperture synthesis imaging and use of Kokkos for VLA/ngVLA gridding/degridding for imaging

Dummy1

Performance Boosting Portable Acceleration of SISSO++ for Symbolic Descriptor Learning with Kokkos

xRage - Moving a Fortran code to GPUs with Kokkos

Afternoon Break

Update links for Programming Guide

https://kokkos.org/programming-guide/ is still pointing to the Kokkos Wiki we just deleted. We should point to the respective pages at https://kokkos.github.io/kokkos-core-wiki/ instead.

Tackling exascale systems for astrophysics

Abstract: I will present a new radiation hydrodynamics code based on the Kokkos library targeting the study of supernovae ejecta.

Morning Break

Kokkos use for the DSA-2000 radio camera processor

kokkos logo top left of page not displayed