OpenMathLib/OpenBLAS

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OpenBLAS is an optimized BLAS library based on GotoBLAS2 1.13 BSD version.

Stars: 7.6k
Forks: 1.7k
Open beginner issues: 0
Indexed issues: 84
Avg merge: 1d 3h
Merged PRs (30d): 42

Dominant language: C
License: BSD-3-Clause
Last GitHub push: Sep 17, 2026
Latest indexed: Sep 20, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed

Beginner friendly Everything

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84 open issues indexed

AMD Zen 5 architecture is misidentified Open

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

OpenMathLib/OpenBLAS#6029 · 21 comments · Opened Sep 13, 2026
SYMBOLSUFFIX have no effect when building static library Open

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

OpenMathLib/OpenBLAS#6028 · 1 comment · Opened Sep 12, 2026
Discussion: Fortran/C interface fixes surfaced by wasm ABI enforcement Open

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

OpenMathLib/OpenBLAS#6005 · 21 comments · 2 reactions · Opened Sep 1, 2026
Consider cleaning up the repository root directory Open

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

OpenMathLib/OpenBLAS#5930 · 2 comments · Opened Jul 19, 2026
Documentation: mkdocs is set for a breaking change. Time to move on? Open

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

OpenMathLib/OpenBLAS#5870 · 4 comments · Opened Jun 25, 2026
BUG: Moore-Penrose Pseudoinverse numerical stability/consistency affected by recent OpenBLAS activity Open

Support

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

OpenMathLib/OpenBLAS#5866 · 22 comments · Opened Jun 24, 2026
Mixture of tabs and spaces can make reading code difficult in some configurations (e.g. browsing on GitHub) Open

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

OpenMathLib/OpenBLAS#5834 · 1 comment · Opened Jun 11, 2026
Data conversion when packing Open

Difficulty 5/5 Over a week Newbie friendliness 28/100

OpenMathLib/OpenBLAS#5647 · 4 comments · Opened Feb 13, 2026
Parallelization along K-dimension (Parallel Reduction) for GEMM with small M/N and large K Open

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

OpenMathLib/OpenBLAS#5629 · 2 comments · Opened Jan 28, 2026
It seems impossible to pin the threads Open

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

OpenMathLib/OpenBLAS#5590 · 4 comments · Opened Jan 3, 2026
OpenBLAS bottlenecks multithreading benefits in `symv.c` interface at 8 working threads due to memory allocator lock conflict Open

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

OpenMathLib/OpenBLAS#5589 · 8 comments · Opened Jan 2, 2026
2 GB at the start Open

Support

Difficulty 4/5 3-5 days Newbie friendliness 42/100

OpenMathLib/OpenBLAS#5587 · 7 comments · 1 reaction · Opened Dec 29, 2025
`BIGNUMA` and `NUM_THREADS>256` on 2×192-core AmpereOne (AArch64) Open

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

OpenMathLib/OpenBLAS#5555 · 3 comments · Opened Nov 28, 2025
GEMM promote perfomance Open

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

OpenMathLib/OpenBLAS#5541 · Opened Nov 19, 2025
Extreme, load dependent slowness on multi-core CPUs with, for example, many iterations of a complex eigenproblem. Open

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

OpenMathLib/OpenBLAS#5517 · 5 comments · 1 reaction · Opened Oct 24, 2025
Need for HGEMM and HGEMV? Open

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

OpenMathLib/OpenBLAS#5502 · 2 comments · Opened Oct 10, 2025
The performance of the OpenBlas library decreases when running in multi-threaded environments Open

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

OpenMathLib/OpenBLAS#5469 · 6 comments · Opened Sep 28, 2025
QUERY: Reduced performance in certain architecture only to-be-regained by `OPENBLAS_NUM_THREADS=1` Open

Distribution packaging problem

OpenMathLib/OpenBLAS#5383 · 16 comments · 1 assignee · Opened Jul 16, 2025
DAXPY outperforms DSCAL in multi-threaded environments Open

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

OpenMathLib/OpenBLAS#5328 · 2 comments · Opened Jun 21, 2025
how to use parallel potrf Open

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

OpenMathLib/OpenBLAS#5246 · 4 comments · Opened Apr 25, 2025
AXPY looks bad especially on MacOS (M4) Open

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

OpenMathLib/OpenBLAS#5230 · 5 comments · 1 reaction · Opened Apr 16, 2025
GEMMTR changes the inputs in CBLAS tests Open

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

OpenMathLib/OpenBLAS#5186 · 4 comments · Opened Mar 19, 2025
perf report shows most cycles spent in blas_thread_server Open

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

OpenMathLib/OpenBLAS#5171 · 9 comments · Opened Mar 5, 2025
Possible data races detected with ThreadSanitizer in ger_thread, ... Open

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

OpenMathLib/OpenBLAS#5153 · 10 comments · Opened Feb 26, 2025
About locking when use OpenBLAS with OpenMP Open

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

OpenMathLib/OpenBLAS#5152 · Opened Feb 25, 2025
Unexpected performance degradation when running experiment Open

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

OpenMathLib/OpenBLAS#5132 · 10 comments · Opened Feb 15, 2025
Memory related issues with OpenMP + OneDAL and OpenMP + Scikit-learn Open

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

OpenMathLib/OpenBLAS#5077 · 2 comments · Opened Jan 16, 2025
Very poor `gemmt` performance compared to `gemm` and `syrk` Open

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

OpenMathLib/OpenBLAS#4921 · 3 comments · Opened Oct 6, 2024
`omatcopy` much slower than `copy` in OMP loop Open

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

OpenMathLib/OpenBLAS#4902 · 1 comment · Opened Sep 21, 2024
Make ICOPY_OPERATION threaded? Open

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

OpenMathLib/OpenBLAS#4834 · 1 comment · Opened Aug 1, 2024
Thread callback for OpenMP backend Open

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

OpenMathLib/OpenBLAS#4770 · 9 comments · Opened Jun 28, 2024
Slow performance of function `dsyev` and `dsyevx` (not fully paralleled) Open

LAPACK issue

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

OpenMathLib/OpenBLAS#4758 · 7 comments · Opened Jun 19, 2024
AVX2: dgemm on HASWELL leads to invalid results (low accuracy) Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

OpenMathLib/OpenBLAS#4747 · 3 comments · Opened Jun 10, 2024
Memory allocation Open

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

OpenMathLib/OpenBLAS#4665 · 3 comments · Opened Apr 28, 2024
gemm execution time is unstable in multi process system Open

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

OpenMathLib/OpenBLAS#4651 · 2 comments · Opened Apr 17, 2024
Splitting gotoblas_t into parameters and kernels to re-use kernels between dynamic targets Open

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

OpenMathLib/OpenBLAS#4445 · 2 comments · Opened Jan 19, 2024
Inquiry and Suggestions Regarding OpenBLAS Code Flow with OpenMP Open

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

OpenMathLib/OpenBLAS#4418 · 8 comments · Opened Jan 5, 2024
Incorrect result with `cblas_dgemv` vs reference netlib and other libraries Open

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

OpenMathLib/OpenBLAS#4324 · 14 comments · Opened Nov 16, 2023
[Feature Request] cblas_zomatadd should be supported. Open

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

OpenMathLib/OpenBLAS#4236 · 5 comments · Opened Sep 21, 2023
Multithreaded Programming using OpenBLAS Open

Difficulty 3/5 1-2 days Newbie friendliness 20/100

OpenMathLib/OpenBLAS#4217 · 7 comments · Opened Sep 6, 2023
performance issue with dnrm2 on zen2 processor (AMD ryzen7 3700x) Open

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

OpenMathLib/OpenBLAS#4188 · 6 comments · Opened Aug 8, 2023
drotg implementation is not up to date with the reference BLAS Open

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

OpenMathLib/OpenBLAS#4130 · 3 comments · Opened Jul 7, 2023
Build failure with -Werror=lto-type-mismatch (LTO) Open

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

OpenMathLib/OpenBLAS#4128 · 13 comments · Opened Jul 6, 2023
risc-v vector v1.0 support Open

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

OpenMathLib/OpenBLAS#4050 · 10 comments · 1 reaction · Opened May 22, 2023
Linking to the library statically on Windows breaks multi-arch support Open

Bug in other software

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

OpenMathLib/OpenBLAS#3985 · 20 comments · Opened Mar 31, 2023
Performance variability Open

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

OpenMathLib/OpenBLAS#3879 · 13 comments · Opened Jan 1, 2023
ThreadSanitizer detects warnings in cblas_dgemm Open

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

OpenMathLib/OpenBLAS#3787 · 9 comments · 2 reactions · Opened Oct 14, 2022
For multithreaded GEMM in OpenBLAS, do I need to call API in the program to ensure thread affinity? Open

Difficulty 3/5 1-2 days Newbie friendliness 18/100

OpenMathLib/OpenBLAS#3533 · 4 comments · Opened Feb 15, 2022
MKL_GETRF equivalnet in OpenBLAS Open

Support

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

OpenMathLib/OpenBLAS#3346 · 10 comments · Opened Aug 19, 2021
cblas_simatcopy: poor performance/avx512 instructions not supported Open

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

OpenMathLib/OpenBLAS#3078 · 6 comments · Opened Jan 21, 2021

OpenMathLib/OpenBLAS

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