llnl/sundials

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Official development repository for SUNDIALS - a SUite of Nonlinear and DIfferential/ALgebraic equation Solvers. Pull requests are welcome for bug fixes and minor changes.

Stars: 686
Forks: 167
Open beginner issues: 0
Indexed issues: 37
Avg merge: 1d 20h
Merged PRs (30d): 17

Dominant language: C
License: BSD-3-Clause
Last GitHub push: Sep 3, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed

Beginner friendly Everything

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37 open issues indexed

[BUG] KLU 64bit integer not recognized Open

bug triage

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

llnl/sundials#1016 · Opened Sep 14, 2026
Sundials libraries 32int and 64int Open

triage

Difficulty 5/5 Over a week Newbie friendliness 45/100

llnl/sundials#1015 · 2 comments · Opened Sep 11, 2026
[BUG] Build on Windows 11 fails with the error "add_subdirectory given source "bindings/sundials4py" which is not an existing directory." Open

bug triage

Difficulty 3/5 1-2 days Newbie friendliness 55/100

llnl/sundials#988 · 3 comments · Opened Aug 11, 2026
[BUG] arkInitialSetup fails with embedding order < 1 for methods with no embedding Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 45/100

llnl/sundials#957 · 4 comments · Opened Jun 11, 2026
Unsmooth continuous functions, solver reinit, performance, ... Open

question

Difficulty 5/5 Over a week Newbie friendliness 25/100

llnl/sundials#947 · 1 reaction · Opened May 30, 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Outdated documentation for CV_TOO_CLOSE Open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
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
SUN_COMM_NULL vs MPI_COMM_NULL in FSUNContext_Create(.,.) Open

triage

Difficulty 3/5 1-2 days Newbie friendliness 48/100

llnl/sundials#898 · 4 comments · Opened Apr 3, 2026
Root function where g(x) = g(x + d) = 0 Open

triage

Difficulty 4/5 3-5 days Newbie friendliness 38/100

llnl/sundials#881 · 3 comments · 1 reaction · Opened Mar 20, 2026
[BUG] IDASolve and IDA_TOO_CLOSE Open

bug triage

llnl/sundials#840 · 1 comment · 1 reaction · 1 assignee · Opened Feb 2, 2026
Solver recommendation for large advection-diffusion (500k cells) Open

question

Difficulty 4/5 3-5 days Newbie friendliness 25/100

llnl/sundials#810 · 4 comments · Opened Jan 13, 2026
How thorough is the scaling in KINSOL? Open

question

llnl/sundials#743 · 1 assignee · Opened Jul 17, 2025
Some examples use deprecated workspace functions. Open

bug

llnl/sundials#725 · 1 comment · 1 assignee · Opened Jun 23, 2025
Examples for `CVodeResizeHistory` when `y` changes size Open

question

llnl/sundials#715 · 4 comments · 1 assignee · Opened Jun 13, 2025
Allow custom loggers Open

feature-request

Difficulty 5/5 Over a week Newbie friendliness 35/100

llnl/sundials#652 · 4 comments · Opened Jan 25, 2025
[BUG] Possible misaligned memory access in GPU fused vector workspace Open

bug triage

Difficulty 4/5 3-5 days Newbie friendliness 35/100

llnl/sundials#619 · Opened Dec 10, 2024
Error building examples on Linux Open

docs enhancement

Difficulty 3/5 1-2 days Newbie friendliness 45/100

llnl/sundials#603 · 4 comments · Opened Dec 2, 2024
Validation for Unset Linear Solver Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 45/100

llnl/sundials#598 · Opened Oct 31, 2024
[BUG] cv_examples.pdf and probably other PDFs have broken references ("??" instead of number) Open

bug docs

llnl/sundials#592 · 2 comments · 1 assignee · Opened Oct 12, 2024
SUNMatScaleAdd Inefficient for Sparse Matrices Open

enhancement pkg-core

llnl/sundials#590 · 1 assignee · Opened Oct 8, 2024
Undocumented return values for CVodeB and IDASolveB Open

docs triage

Difficulty 3/5 1-2 days Newbie friendliness 45/100

llnl/sundials#580 · Opened Sep 28, 2024
[BUG] ARKodeSetDefaults assumes ReInit Open

bug triage

Difficulty 4/5 3-5 days Newbie friendliness 38/100

llnl/sundials#569 · Opened Sep 11, 2024
[BUG] SUNDIALS fails to build due to a linker error with MSYS+gfortran on Windows Open

archos-windows bug build-error

Difficulty 4/5 3-5 days Newbie friendliness 35/100

llnl/sundials#507 · 2 comments · Opened Jun 19, 2024
Question about KINSOL behavior Open

question

Difficulty 4/5 3-5 days Newbie friendliness 25/100

llnl/sundials#500 · 17 comments · Opened Jun 3, 2024
Fortran interface in separate repository Open

feature-request Fortran

Difficulty 5/5 Over a week Newbie friendliness 25/100

llnl/sundials#301 · 6 comments · Opened Jul 11, 2023
Support GPU backends other than Intel in our SYCL modules Open

feature-request tpl-onemkl

Difficulty 5/5 Over a week Newbie friendliness 25/100

llnl/sundials#255 · Opened Mar 2, 2023
Provide pkg-config files Open

cmake feature-request

Difficulty 4/5 3-5 days Newbie friendliness 38/100

llnl/sundials#242 · 3 comments · Opened Dec 24, 2022
Is there support for a user defined scratch memory pool Open

feature-request

Difficulty 5/5 Over a week Newbie friendliness 25/100

llnl/sundials#232 · 7 comments · Opened Dec 2, 2022
onemkl linear solver doesn't have a default difference quotient jacobian? Open

feature-request

Difficulty 4/5 3-5 days Newbie friendliness 45/100

llnl/sundials#182 · 9 comments · Opened Jul 29, 2022
Multiple Jacobian calls with kinsol and Picard iterations Open

feature-request

llnl/sundials#120 · 5 comments · 1 assignee · Opened Mar 25, 2022
Avoid use of reserved names. Open

api-change enhancement feature-request

Difficulty 4/5 3-5 days Newbie friendliness 38/100

llnl/sundials#114 · 2 comments · Opened Feb 23, 2022
Out-of-bounds access in CVODE when vector of absolute tolerances has the wrong shape Open

feature-request

Difficulty 4/5 3-5 days Newbie friendliness 35/100

llnl/sundials#108 · 1 comment · Opened Jan 3, 2022
Undefined reference to `psolve' when LTO flags are used Open

build-error Fortran triage

llnl/sundials#97 · 1 assignee · Opened Dec 18, 2021
CVode returns wrong yout if h becomes zero Open

pkg-CVODE pkg-CVODES triage

Difficulty 4/5 3-5 days Newbie friendliness 45/100

llnl/sundials#82 · 1 comment · Opened Oct 8, 2021
Segmentation fault in CVAdataStore Open

enhancement pkg-CVODES

llnl/sundials#49 · 5 comments · 1 assignee · Opened Sep 10, 2020
Missing check for out of bounds array access Open

pkg-CVODES triage

llnl/sundials#33 · 1 assignee · Opened Mar 1, 2020
Segmentation fault in CVAfindIndex Open

pkg-CVODES triage

Difficulty 4/5 3-5 days Newbie friendliness 25/100

llnl/sundials#31 · 2 comments · Opened Feb 26, 2020

llnl/sundials

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