NVIDIA/AMGX

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Distributed multigrid linear solver library on GPU

Stars: 692
Forks: 197
Open beginner issues: 0
Indexed issues: 121

Dominant language: Cuda
License: No license data
Last GitHub push: Jul 9, 2026
Latest indexed: Sep 19, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: good first issue help wanted
PR merge metrics: No merged PRs in 30d

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121 open issues indexed

[Issue] Solving the same system on multi GPUs repeatedly gives different results Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 55/100

NVIDIA/AMGX#381 · Opened Sep 13, 2026
[Issue] CLASSICAL AMG fails with `cudaErrorInvalidDeviceFunction` on CUDA 13 / SM89 while AGGREGATION works Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 48/100

NVIDIA/AMGX#380 · Opened Sep 11, 2026
[Issue] Device dotc uses unconjugated cuBLAS dotu and breaks complex GMRES orthogonalization Open

bug

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

NVIDIA/AMGX#377 · Opened Aug 25, 2026
how to set the min_iters in the configure file. Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

NVIDIA/AMGX#376 · Opened Aug 23, 2026
Feature: Smoothed Aggregation AMG with MIS-k selectors (prototype available) Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

NVIDIA/AMGX#373 · 1 comment · 3 reactions · Opened May 15, 2026
Question about smoothed aggregation Open

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

NVIDIA/AMGX#369 · Opened Apr 21, 2026
"optimal" configuration file Open

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

NVIDIA/AMGX#367 · Opened Mar 27, 2026
How to set solver's parameters to eliminate isolated equations' effect? Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

NVIDIA/AMGX#365 · Opened Feb 2, 2026
The official version of amgx4foam Open

Difficulty 1/5 Under an hour Newbie friendliness 35/100

NVIDIA/AMGX#362 · 2 comments · Opened Jan 22, 2026
AMGX 2.5.0: FGMRES/BiCGStab stagnates near 3e-3 residual on large real general system; many rows have near-zero row-sum; some AMG configs produce NaN residual Open

build issues

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

NVIDIA/AMGX#361 · Opened Dec 24, 2025
AMGX 2.5.0 solver stagnation on large system Open

build issues

Difficulty 4/5 3-5 days Newbie friendliness 15/100

NVIDIA/AMGX#360 · Opened Dec 24, 2025
[Build] Open

build issues

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

NVIDIA/AMGX#358 · 1 comment · Opened Dec 21, 2025
[Issue]I think I might have encountered a bug. When I use the following configuration, the AMGX solver freezes. I'm not even sure if it has entered the solving state—it just stalls. Open

bug

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

NVIDIA/AMGX#353 · Opened Dec 8, 2025
Are there best practices for AMGX on multiple GPUs? (NVLink) Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

NVIDIA/AMGX#352 · Opened Dec 6, 2025
[Build] Difficulty building with CUDA 12.9+ Open

build issues

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

NVIDIA/AMGX#351 · 3 comments · Opened Nov 28, 2025
[Issue] When I set the convergence criterion to the absolute residual, the AMGX iteration log reports that “Relative residual has reached machine precision” and then stops further iterations. Open

bug

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

NVIDIA/AMGX#350 · 1 comment · Opened Nov 22, 2025
Can AMGX implement the additive Schwarz preconditioning method across multiple GPUs? Open

new feature

Difficulty 5/5 Over a week Newbie friendliness 20/100

NVIDIA/AMGX#349 · 1 comment · 1 reaction · Opened Nov 16, 2025
What preprocessing methods are supported for PCG Open

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

NVIDIA/AMGX#347 · 1 comment · Opened Aug 19, 2025
[Build] Conda build error, nvtx3 not found Open

build issues

Difficulty 3/5 1-2 days Newbie friendliness 35/100

NVIDIA/AMGX#346 · Opened Aug 12, 2025
Compiling AMGX with NVHPC 25.5 Open

build issues

NVIDIA/AMGX#344 · 1 assignee · Opened Jul 8, 2025
How is the bandwidth of non-symmetric matrices reduced for ILU(0) preconditioner Open

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

NVIDIA/AMGX#343 · Opened Jun 16, 2025
[Issue] Solver reports wrong vector size in parallel, whereas simple SpMV is correct Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 30/100

NVIDIA/AMGX#342 · 1 comment · Opened Jun 11, 2025
Solving Ax=b and A and b are sparse matrix and vector in mtx format - no solution yet. Open

Difficulty 4/5 3-5 days Newbie friendliness 20/100

NVIDIA/AMGX#341 · Opened Apr 7, 2025
Latest Reference Open

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

NVIDIA/AMGX#340 · 1 reaction · Opened Apr 3, 2025
MPI_Direct benefits ? Open

bug

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

NVIDIA/AMGX#339 · 1 comment · Opened Mar 10, 2025
Example partition vector file Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

NVIDIA/AMGX#337 · 1 comment · Opened Feb 19, 2025
Unable to run examples after successful build Open

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

NVIDIA/AMGX#334 · Opened Jan 23, 2025
configs files in src/configs are duplicate Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

NVIDIA/AMGX#333 · Opened Jan 15, 2025
How to call AMGX using Fortran? Open

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

NVIDIA/AMGX#332 · 1 comment · Opened Dec 19, 2024
Thoughts on supporting lower precision floats Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

NVIDIA/AMGX#331 · Opened Nov 26, 2024
How to create matrix from not importing file? Open

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

NVIDIA/AMGX#329 · 4 comments · Opened Nov 3, 2024
[Build]Compiling with Pre-Installed OpenMPI Open

build issues

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

NVIDIA/AMGX#328 · 2 comments · Opened Nov 1, 2024
Problems with Cmake compilation Open

build issues

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

NVIDIA/AMGX#327 · 2 comments · 1 reaction · Opened Oct 23, 2024
Doesn't compile with CUDA 12.6.77 using conda environment Open

build issues

Difficulty 3/5 1-2 days Newbie friendliness 35/100

NVIDIA/AMGX#326 · 3 comments · Opened Oct 19, 2024
[Build]How to use OpenMPI and multi GPU parallel calling AMGX? Open

build issues

Difficulty 5/5 Over a week Newbie friendliness 20/100

NVIDIA/AMGX#324 · 5 comments · Opened Sep 4, 2024
[How can I use the eigensolvers configs in eigen_examples?] Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 25/100

NVIDIA/AMGX#322 · 1 reaction · Opened Aug 8, 2024
[Issue] "Reorder_cols_by_color" error when using MULTICOLOR_ILU Open

bug

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

NVIDIA/AMGX#320 · 2 comments · Opened Jul 31, 2024
Matrix with number of nonzero more than 2147483647 Open

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

NVIDIA/AMGX#318 · 2 comments · Opened Jul 26, 2024
Caught amgx exception: getFixedSizesForView should not be called by a non-distributed matrix Open

bug

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

NVIDIA/AMGX#317 · Opened Jul 4, 2024
"Cannot allocate pinned memory" error on a supercomputer Open

bug

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

NVIDIA/AMGX#316 · 5 comments · Opened Jul 2, 2024
[Issue]Caught amgx exception: SelectorFactory 'PMIS' has not been registered Open

bug

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

NVIDIA/AMGX#315 · 11 comments · Opened Jun 28, 2024
Caught amgx exception: Cannot allocate pinned memory Open

bug

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

NVIDIA/AMGX#313 · 3 comments · Opened Jun 14, 2024
AMGX crashed due to out of memory[Issue] Open

bug

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

NVIDIA/AMGX#306 · 1 comment · Opened May 22, 2024
[Issue]solution depends on the number of levels of AMG grid Open

bug

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

NVIDIA/AMGX#305 · 4 comments · Opened May 10, 2024
Seeking advice for setting up solver for finite element Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

NVIDIA/AMGX#303 · 4 comments · Opened Apr 26, 2024
AMGX Fails to Converge to the Correct Solution Open

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

NVIDIA/AMGX#302 · 2 comments · Opened Apr 24, 2024
[Build] CMake Error in Windows with GCC Open

build issues

Difficulty 4/5 3-5 days Newbie friendliness 28/100

NVIDIA/AMGX#296 · 3 comments · Opened Feb 17, 2024
[Issue] Recovering from out of memory error Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 32/100

NVIDIA/AMGX#289 · 3 comments · Opened Jan 11, 2024
Seeking Advice on Configuring AMGX for Solving a Poorly-Conditioned Matrix Equation Open

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

NVIDIA/AMGX#287 · 2 comments · Opened Dec 16, 2023
[Build] Build Error with MVAPICH2-GDR Open

build issues

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

NVIDIA/AMGX#284 · 5 comments · Opened Dec 2, 2023

NVIDIA/AMGX

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