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llnl

259 indexed repositories · View on GitHub

zfp
Compressed numerical arrays that support high-speed random access

C++ · 885 stars
rose
ROSE is an open-source compiler framework engineered by LLNL supporting program analysis and transformation at both the source and binary...

C · 688 stars
sundials
Official development repository for SUNDIALS - a SUite of Nonlinear and DIfferential/ALgebraic equation Solvers. Pull requests are welcom...

C · 686 stars
RAJA
RAJA Performance Portability Layer (C++)

C++ · 598 stars
OGhidra
OGhidra bridges Large Language Models (LLMs) via Ollama with the Ghidra reverse engineering platform, enabling AI-driven binary analysis ...

Python · 440 stars
Umpire
An application-focused API for memory management on NUMA & GPU architectures

C++ · 422 stars
Caliper
Caliper is an instrumentation and performance profiling library

C++ · 420 stars
blt
A streamlined CMake build system foundation for developing HPC software

C++ · 296 stars
HPC-Tutorials
Future home of hpc-tutorials.llnl.gov

C · 257 stars
SAMRAI
Structured Adaptive Mesh Refinement Application Infrastructure - a scalable C++ framework for block-structured AMR application development

C++ · 250 stars
LEAP
comprehensive library of 3D transmission Computed Tomography (CT) algorithms with Python and C++ APIs, a PyQt GUI, and fully integrated w...

Cuda · 249 stars
conduit
Simplified Data Exchange for HPC Simulations

C++ · 248 stars
smith
Smith is a high order nonlinear thermomechanical simulation code

C++ · 245 stars
libROM
Data-driven model reduction library with an emphasis on large scale parallelism and linear subspace methods

C++ · 236 stars
hiop
HPC solver for nonlinear optimization problems

C++ · 229 stars
magpie
Magpie contains a number of scripts for running Big Data software in HPC environments, including Hadoop and Spark. There is support for L...

Shell · 198 stars
axom
CS infrastructure components for HPC applications

C++ · 196 stars
units
A run-time C++ library for working with units of measurement and conversions between them and with string representations of units and me...

C++ · 171 stars
maestrowf
A tool to easily orchestrate general computational workflows both locally and on supercomputers

Python · 161 stars
merlin
Machine Learning for HPC Workflows

Python · 151 stars
239 more repositories live on View on GitHub

Beginner friendly Everything

Open All

ODR violation in GWN Open

App Integration bug compiler Quest User Request

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

llnl/axom#1983 · Opened Sep 15, 2026
Add "known version" to `cmake_minimum_required` in `ConduitConfig.cmake` Open

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

llnl/conduit#1697 · Opened Sep 10, 2026
Update `flux-python` to the Latest Version Open

enhancement

Difficulty 2/5 1-3 hours Newbie friendliness 65/100

llnl/mada-tools#54 · Opened Sep 1, 2026
AttributeError: module 'pkgutil' has no attribute 'get_loader' on Python 3.14 Open

Difficulty 2/5 1-3 hours Newbie friendliness 70/100

llnl/maestrowf#486 · Opened Aug 24, 2026
The docs for the braid example are misleading Open

docs

Difficulty 1/5 Under an hour Newbie friendliness 85/100

llnl/conduit#1677 · 1 reaction · Opened Aug 20, 2026
Add optional comparison operator to array::sort() Open

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

llnl/ygm#433 · Opened Aug 20, 2026
SLIC_DEBUG_IF dependent on AXOM_DEBUG rather than TRIBOL_DEBUG Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

llnl/Tribol#235 · Opened Aug 6, 2026
Create helper macro for test name string Open

Difficulty 2/5 1-3 hours Newbie friendliness 70/100

llnl/smith#1640 · Opened Aug 5, 2026
Create a Tutorial for Connecting to AWS Bedrock Open

documentation

Difficulty 2/5 1-3 hours Newbie friendliness 70/100

llnl/mada#28 · Opened Aug 5, 2026
Remove `stage()` and `execute()` from `MADABaseJobManager` Open

enhancement

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

llnl/mada-tools#46 · Opened Aug 5, 2026
Ruff Docstrings Open

documentation

Difficulty 1/5 Under an hour Newbie friendliness 85/100

llnl/mada-tools#45 · Opened Aug 5, 2026
Create a Tutorial for Connecting MADA to URSA Open

documentation

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

llnl/mada#24 · Opened Aug 5, 2026
Create a Basic Tutorial for using MCP Servers Open

documentation

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

llnl/mada-tools#33 · Opened Aug 5, 2026
Add uv to our docker CI images Open

CI maintenance Reviewed

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

llnl/axom#1937 · Opened Aug 2, 2026
Do not use verbose builds in the warnings as errors CI builds Open

CI Reviewed

Difficulty 2/5 1-3 hours Newbie friendliness 65/100

llnl/axom#1935 · Opened Jul 31, 2026
load_tif_python ignores a provided array and crashes when called without one Open

Difficulty 1/5 Under an hour Newbie friendliness 88/100

llnl/LEAP#213 · Opened Jul 31, 2026
Add citation information/shortcut to the README.md Open

docs

Difficulty 1/5 Under an hour Newbie friendliness 91/100

llnl/conduit#1659 · Opened Jul 29, 2026
MPI-5 ABI fix for MPI_THREAD_* constants (noncontiguous) Open

Difficulty 2/5 1-3 hours Newbie friendliness 86/100

llnl/Quicksilver#71 · Opened Jul 28, 2026
Use `spack isolate` Open

Difficulty 2/5 1-3 hours Newbie friendliness 64/100

llnl/uberenv#161 · Opened Jul 14, 2026
Remove ability to turn off Gretl Open

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

llnl/smith#1630 · Opened Jul 13, 2026
Improve logging by adding timestamps Open

Difficulty 2/5 1-3 hours Newbie friendliness 65/100

llnl/wormhole-token-service#8 · Opened Jul 9, 2026
Properly handle error when no default domain is defined Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

llnl/wormhole-route-registry#6 · Opened Jul 9, 2026
Require OAuth for docs pages Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

llnl/wormhole-route-registry#4 · Opened Jul 9, 2026
Setup mocks to be used for tests Open

Difficulty 2/5 1-3 hours Newbie friendliness 65/100

llnl/wormhole-cli#3 · Opened Jul 9, 2026
add example of conduit::relay::mpi::io::blueprint::save_mesh to docs Open

docs

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

llnl/conduit#1641 · Opened Jul 2, 2026
`slurm_get_rem_time` interface updated in Slurm 26, breaks building libyogrt Open

Difficulty 2/5 1-3 hours Newbie friendliness 70/100

llnl/libyogrt#22 · 2 comments · Opened Jun 23, 2026
INGRID pip (or similar open-source-free-to-obtain-package manager) install instructions Open

Difficulty 2/5 1-3 hours Newbie friendliness 70/100

llnl/INGRID#48 · Opened Jun 22, 2026
Environment Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

llnl/mttime#14 · Opened Jun 11, 2026
Caliper cali2eventtrace.py missing default time variable from Caliper 2.14 Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

llnl/Caliper#738 · Opened May 20, 2026
Suggest changes to CyTRICS schema Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

llnl/Surfactant#618 · Opened May 12, 2026
Outdated documentation for CV_TOO_CLOSE Open

bug triage

Difficulty 2/5 1-3 hours Newbie friendliness 70/100

llnl/sundials#923 · Opened Apr 27, 2026
configure --with-glibc-be-dir override is silently ignored Open

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

llnl/Spindle#173 · 1 comment · Opened Apr 17, 2026
Use pathlib to compare paths Open

Difficulty 2/5 1-3 hours Newbie friendliness 62/100

llnl/pEyeON-Analytics#3 · Opened Apr 7, 2026
Catch box missing credentials Open

Difficulty 2/5 1-3 hours Newbie friendliness 62/100

llnl/pEyeON#85 · Opened Apr 6, 2026
Usless assigments to argument Open

enhancement

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

llnl/sundials#899 · 3 comments · Opened Apr 3, 2026
Create ability to error out if a below minimum required BLT_CXX_STD is set Open

Difficulty 2/5 1-3 hours Newbie friendliness 65/100

llnl/blt#758 · 1 comment · Opened Mar 25, 2026
Remove duplicate plot_test_predictions function Open

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

llnl/SEAMsurrogates#36 · Opened Mar 25, 2026
Subaudit/update_pltbind.c contains unreachable code Open

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

llnl/Spindle#149 · 2 comments · Opened Mar 19, 2026
Partition options table is formatted badly in the docs Open

docs

Difficulty 1/5 1-3 hours Newbie friendliness 65/100

llnl/conduit#1540 · Opened Mar 9, 2026
from_caliper Examples Not Working for Caliper>=2.10 Open

Difficulty 2/5 1-3 hours Newbie friendliness 64/100

llnl/hatchet#161 · Opened May 16, 2025
TOSS-04-010180 - possible syntax error Open

Difficulty 1/5 Under an hour Newbie friendliness 68/100

llnl/toss-stig#64 · Opened Jan 8, 2025
`topics` has a typo of `simulation` as `simluation` Open

Difficulty 1/5 Under an hour Newbie friendliness 65/100

llnl/prorad#6 · Opened Dec 23, 2024
`description` has a typo of `multiscale` as `multsicale` Open

Difficulty 1/5 Under an hour Newbie friendliness 65/100

llnl/MultiscaleTopOpt#1 · Opened Dec 23, 2024
`description` has a typo of `efficient` as `efficent` Open

Difficulty 1/5 Under an hour Newbie friendliness 68/100

llnl/fastcam#2 · Opened Dec 22, 2024
Incorrect/ambiguous `cd_values` documentation Open

Difficulty 2/5 1-3 hours Newbie friendliness 63/100

llnl/H5Z-ZFP#145 · Opened Oct 10, 2024
SetupCompilerOptions erroneously classifies "CrayClang" as "Clang" Open

Difficulty 2/5 1-3 hours Newbie friendliness 64/100

llnl/blt#699 · Opened Sep 10, 2024
use new top level mesh bp generate in conduit_generate_data util Open

Difficulty 2/5 1-3 hours Newbie friendliness 62/100

llnl/conduit#1308 · Opened Jul 23, 2024
Add link to paper in README Open

Difficulty 1/5 Under an hour Newbie friendliness 65/100

llnl/msr-genie#10 · Opened May 2, 2024
Support C++17 Open

Difficulty 1/5 1-3 hours Newbie friendliness 68/100

llnl/polytope#19 · Opened Feb 24, 2023
CMP0054 warning Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

llnl/conduit#499 · 1 comment · Opened Jan 18, 2020

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