Jeff Hammond

mpi-abi-trampoline. A trampoline generator for the MPI 5.0 ABI

frozen. a header-only, constexpr alternative to gperf for C++14 users

ICPE-talk. Keynote talk delivered by Didem Unat at Intl Conference on Performance Engineering 2026

cuda-ipc-benchmarks. Cuda

kamping. KaMPIng: (Near) zero-overhead MPI wrapper for modern C++

libmp. Simple message passing library

BitBLAS. BitBLAS is a library to support mixed-precision matrix multiplications, especially for quantized LLM deployment.

BitNet. Official inference framework for 1-bit LLMs

param. PArametrized Recommendation and Ai Model benchmark is a repository for development of numerous uBenchmarks as well as end to end nets for evaluation of training and inference platforms.

Awesome-LLM-Inference. 📚A curated list of Awesome LLM/VLM Inference Papers with Codes: Flash-Attention, Paged-Attention, WINT8/4, Parallelism, etc.🎉

bgq-driver. Blue Gene/Q driver, see https://repo.anl-external.org/repos/bgq-driver/

icecream-cpp. 🍦 Never use cout/printf to debug again

fortitude. A Fortran linter, written in Rust and installable with Python.

pcvs-benchmarks. Parallel Computing -- Validation Suite: Validation engine for Exascale project benchmarks

blis-fortran. Fortran bindings generated using Coccinelle

Modern-CPP-Programming. Modern C++ Programming Course (C++03/11/14/17/20/23/26)

isatomic. Test if AVX vector loads and stores are atomic

tensor-interfaces. A place to store information for the tensor discussions and possible specifications.

McMurchie-Davidson. do a simple closed shell Hartree-Fock using McMurchie-Davidson to compute integrals

library. Data structures, algorithms, and C++ reference library

llm.f90. LLM inference in Fortran

pfapack. Efficient numerical computation of the Pfaffian for dense and banded skew-symmetric matrices

julia-on-gh200. Julia

fortran-compiler-test-suite. A framework and suite of cases for testing a Fortran compiler

SGEMM_CUDA. Fast CUDA matrix multiplication from scratch

MultithreadingBenchmarks.jl. C

GemmKernels.jl. Flexible and performant GEMM kernels in Julia

geomeTRIC. Geometry optimization code that includes the TRIC coordinate system

optking. optking: A molecular geometry optimization program

pyberny. Molecular structure optimizer

accelerated-dft. Repository to host supporting information and code samples for Accelerated DFT

llm.c. LLM training in simple, raw C/CUDA

minGPT. A minimal PyTorch re-implementation of the OpenAI GPT (Generative Pretrained Transformer) training

cuGBasis. High performance CUDA/Python library for computing quantum chemistry density-based descriptors for larger systems using GPUs.

gmtfPDF. A Google Chrome extension that modifies journal links so they give you the F'ing PDF.

mpi4all. MPI4All: Universal Binding Generation for MPI Parallel Programming

NECI_STABLE. Standalone NECI codebase designed for FCIQMC and other stochastic quantum chemistry methods.

Fermi.jl. Fermi quantum chemistry program

gbasis. Python library for analytical evaluation and integration of Gaussian-type basis functions and related quantities.

mpifx. Modern Fortran wrappers around MPI routines

ProgrammingProjects. C++ Programming Tutorial in Chemistry

mscclpp. MSCCL++: A GPU-driven communication stack for scalable AI applications

neural-fortran. A parallel framework for deep learning

idc. Helper Files for IDC

ctest_gpu_mpi. To reproduce the GPU-aware MPI with OpenACC Fortran code on Perlmutter

cuda. Ada

exachem. Open Source Exascale Quantum Chemistry Software

gpu4pyscf. A plugin to use Nvidia GPU in PySCF package

fortran-wringer-tests. A collection of non-portable Fortran usage, standard-conformant or otherwise

fortran-tests. fortran-tests

TensorNetwork. A library for easy and efficient manipulation of tensor networks.

folly. An open-source C++ library developed and used at Facebook.

cutlass. CUDA Templates and Python DSLs for High-Performance Linear Algebra

icar. The Intermediate Complexity Atmospheric Research model (ICAR)

asm_book. A book teaching assembly language programming on the ARM 64 bit ISA. Along the way, good programming practices and insights into code development are offered which apply directly to higher level languages.

abseil-cpp. Abseil Common Libraries (C++)

cori-mpi-rma. A simple example of MPI RMA to run on Cori

distributed-ranges. Distributed ranges is a generalization of C++ ranges for distributed data structures.

mpi4py. Python bindings for MPI

shmem4py. Python bindings for OpenSHMEM

sc22-ahug-symposium. Archival event site for the SC 2022 AHUG Symposium

tweets. janky twitter replacement.

shroud. Shroud: generate Fortran and Python wrappers for C and C++ libraries

mkl-verbose-toolkit. Tools to run and parse MKL verbose mode

stdexec. `std::execution`, the standard C++ framework for asynchronous and parallel programming.

concurrency-programming-via-rust. Rust

abi-compliance-checker. A tool for checking backward API/ABI compatibility of a C/C++ library

ISO_Fortran_binding. C/Fortran interoperability library

GPU_workshop. HTML

llvm-project. The LLVM Project is a collection of modular and reusable compiler and toolchain technologies.

bspmm. A mini-app that captures the communication pattern of NWChem---block-sparse matrix multiplication---in flat MPI and hybrid MPI+OpenMP configurations.

ascr-software-stewardship-rfi-responses. Responses to 2021 RFI on Stewardship of Software for Scientific and High-Performance Computing

memory-bandwidth-benchmarks. Provides a set of benchmarks that can be used to measure the memory bandwidth performance of CPU's

tutorial-multi-gpu. Efficient Distributed GPU Programming for Exascale, an SC/ISC Tutorial

pixeltrack-standalone. Standalone Patatrack pixel tracking

ccinput. Computational Chemistry Input Generator

cuDecomp. An Adaptive Pencil Decomposition Library for NVIDIA GPUs

pycc. PyCC is a simple, Python-based, reference implementation of the coupled cluster method of ab initio quantum chemistry.

gcc-darwin-arm64. GCC master branch for Darwin with experimental support for Arm64. Currently GCC-17.0.0 [June 2026]

CUDALibrarySamples. CUDA Library Samples

DiffiQult. A fully autodifferentiable and variational HF

Fortran-code-on-GitHub. Directory of Fortran codes on GitHub, arranged by topic

MaHyCo. Maquette hydrodynamique collaborative

framework. The Arcane Framework for HPC codes

mpi-forum-historic. Migration of old MPI Forum Trac Tickets to GitHub. New issues belong on mpi-forum/mpi-issues.

circustent. Memory system characterization benchmarks using atomic operations

phoebus. Phifty One Ergs Blows Up A Star

pyscf-tblis. A wrapper to call TBLIS functions

lomp. Little OpenMP Library

ITensors.jl. A Julia library for efficient tensor computations and tensor network calculations. ITensors.jl is supported by the Simons Foundation's Flatiron Institute.

f77tof90. A python script that reads in a fortran 77 (.f or .F) fixed form file and converts it to a free form Fortran 90 file (.f90 or .F90).

MPIwrapper. A wrapper for MPI libraries, implementing an MPI ABI

MPItrampoline. A forwarding MPI implementation that can use any other MPI implementation via an MPI ABI

ARM_documents. Documents for ARM

ComputeLibrary. The Compute Library is a set of computer vision and machine learning functions optimised for both Arm CPUs and GPUs using SIMD technologies.

porting-advisor. Scans for potential unported or non-portable code in source code trees.

Incompact3d. Current CPU version of our solver for the Navier-Stokes equations

web-cpuid. Lightweight web-based CPUID decoder and visualiser.

MatX. An efficient C++20 GPU numerical computing library with Python-like syntax

TSVC_2. Updated C version of the Test Suite for Vectorising Compilers

modern-arm-assembly-language-programming. Source Code for 'Modern Arm Assembly Language Programming' by Daniel Kusswurm

HPCG_for_Arm. C++

xpmem. Linux Cross-Memory Attach

PRK. This is a set of simple programs that can be used to explore the features of a parallel platform.

hpl-ai. An HPL-AI implementation for Fugaku

wi4mpi. Wrapper interface for MPI

fortran_proposals. Proposals for the Fortran Standard Committee

bale. C

fortran2018-examples. Fortran 2018 standard examples with broad applications

beaglev-starlight.

Fedora_on_StarFive.

cuda-samples. Samples for CUDA Developers which demonstrates features in CUDA Toolkit

gpubootcamp. This repository consists for gpu bootcamp material for HPC and AI

dmma-ptx-gemm. Cuda

pymolresponse. Molecular frequency-dependent response properties for arbitrary operators

nvbio. NVBIO is a library of reusable components designed to accelerate bioinformatics applications using CUDA.

cblas. Wrappers for CBLAS (C)

patterns. Makefile

multi-gpu-programming-models. Examples demonstrating available options to program multiple GPUs in a single node or a cluster

SHAD. Scalable High-performance Algorithms and Data-structures

turing-pi-scripts. Miscellaneous scripts for my Turing Pi setup. Turn on and off all nodes with a command or power button and have a power LED.

miniBUDE. A BUDE virtual-screening benchmark, in many programming models

data-parallel-CPP. Source code for 'Data Parallel C++: Mastering DPC++ for Programming of Heterogeneous Systems using C++ and SYCL' by James Reinders, Ben Ashbaugh, James Brodman, Michael Kinsner, John Pennycook, Xinmin Tian (Apress, 2020).

gmt. Global Memory and Threading runtime system

fortran-do-test. Testing do loops in modern fortran

oshmpi. OpenSHMEM Implementation on MPI

HeCBench. C++

desul. Department of Energy Standard Utility Library

alcl. Argonne Leadership Computing Facility OpenCL tutorial

Reverse_Time_Migration. An acoustic, isotropic, 2D reverse time migration implemented on OpenMP and DPC++ technologies

myGEMM. Code appendix to an OpenCL matrix-multiplication tutorial

enzyme. Rapid HPC Orchestration in the Cloud

mpi-cpp. MPI ( Message Passing Interface ) C++ bindings

bcl. The Berkeley Container Library

NiceMPI. An alternative to Boost.MPI for a user friendly C++ interface for MPI (MPICH).

TheBandwidthBenchmark. The ultimate bandwidth benchmark

weave. A state-of-the-art multithreading runtime: message-passing based, fast, scalable, ultra-low overhead

Rodinia_SYCL. C

SYCL-For-CUDA-Examples. Examples for using SYCL on CUDA

cython-blis. 💥 Fast matrix-multiplication as a self-contained Python library – no system dependencies!

gups-shmem. Giga Updates Per Second

ambermini. A stripped-down set of just antechamber, sqm, and tleap.

remora. REMORA: REsource MOnitoring for Remote Applications

timemory. Modular C++ Toolkit for Performance Analysis and Logging. Profiling API and Tools for C, C++, CUDA, Fortran, and Python. The C++ template API is essentially a framework to creating tools: it is designed to provide a unifying interface for recording various performance measurements alongside data logging and interfaces to other tools.

CppSPMD_Fast. Optimized CppSPMD test project: macro control flow, SSE4.1/AVX1/AVX2/AVX2 FMA support

oneapi-ci. Sample configuration files for using oneAPI in CI systems

cray-openshmemx. Public Cray OpenSHMEMX software stack related announcements

cloverleaf_sycl. C++

PPP. Parallel Programming Playground

SimpleOpenCLSamples. Simple OpenCL Samples that Build with Khronos Headers and Libs

CabanaPIC. Structured PIC proxy app based on Cabana

miniVite. MPI+OpenMP implementation of the first phase of Louvain method for Graph Community Detection

SYCL_Tutorials. Tutorials for SYCL / DPC++ Using OneAPI

libunifex. Unified Executors

OSACA. Open Source Architecture Code Analyzer

agency. Execution primitives for C++

assembly-loop-extractor. Python

MG-CFD-performance-model. Python

MG-CFD-app-plain. C++

sycl_derived_types. C++

Chapter5. Chapter 5 of Parallel and High Performance Computing book

SyCLDslash. C++

SYCL-CTS. SYCL Conformance Tests

cuda-api-wrappers. Thin, unified, C++-flavored wrappers for the CUDA APIs

oneMath. oneAPI Math Library (oneMath)

foMPI-NA. C

freestanding. C++

ga-manual. Global Arrays User Manual

oneAPI-spec. oneAPI Specification source files

openmp-tutorial. Exercises and Solutions for "Programming Your GPU with OpenMP: A Hands-On Introduction"

GTMatrix. Buzz Matrix

sycltrain. Training examples for SYCL

RAJAPerf. RAJA Performance Suite

Intel-SDE-FLOPS. Computing FLOPs with Intel Software Development Emulator (Intel SDE)

stream-fpga. Implementation of the STREAM benchmark for FPGA

rsd. RSD: RISC-V Out-of-Order Superscalar Processor

GTS-GamesTaskScheduler. A task scheduling framework designed for the needs of game developers.

fft3d-fpga. FFTFPGA is an OpenCL based library for Fast Fourier Transformations for FPGAs. This repository provides OpenCL host code in the form of FFTW like APIs as well as OpenCL kernel designs that can be synthesized to bitstreams.

BaseKit-code-samples.

SPIRV-Cross. SPIRV-Cross is a practical tool and library for performing reflection on SPIR-V and disassembling SPIR-V back to high level languages.

hipcl. OpenCL/SPIR-V implementation of HIP

compute-samples. Intel® GPU Compute Samples

syclacademy. SYCL Academy, a set of learning materials for SYCL heterogeneous programming

opencl-osx.

blas-shim. Wrapper generator for the Fortran BLAS interface.

page-info. Programatically obtain information about the pages backing a given memory region

modern-x86-assembly-language-programming-2e. Source Code for 'Modern X86 Assembly Language Programming' by Daniel Kusswurm

parallel_for. The SYCL Parallel For test

cpuid. A simple CPUID decoder/dumper for x86/x86_64

SPIRV-LLVM-Translator. A tool and a library for bi-directional translation between SPIR-V and LLVM IR

FBLAS. BLAS implementation for Intel FPGA

Comb. Comb is a communication performance benchmarking tool.

Matrix-Reduction-openCL. Matrix Reduction openCL

Immintrin-debug. immintrin_dbg.h is an include file, a wrapper around immintrin.h. It implements most of AVX, AVX2, AVX-512 vector intrinsics to enable source level debug of vector code.

IntelGenBench. Intel Integrated Graphic Benchmarking Suite

cgmemtime. cgmemtime measures the high-water RSS+CACHE memory usage of a process and its descendant processes.

froozle-mpi. A dummy, no-op MPI implementation for https://github.com/mpi-forum/mpi-issues/issues/137

meow. Meow hash for Golang

SYCL-Docs. SYCL Open Source Specification

hpl-gpu. High Performance Linpack for GPUs (Using OpenCL, CUDA, CAL)