OpenBLAS

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sgemv() not scaling well on AMD ZEN 2 / EPYC 7742

36

Hi, I benchmarked OpenBLAS' 0.3.8 sgemv() on a dual AMD EPYC 7742 (64 cores each) for a 4000x4000 matrix and I find that the performance maxes out at about 48...

eastwindow

HWCAP_CPUID should not be used to detect CPU uarch on aarch64

19

Ref https://github.com/xianyi/OpenBLAS/issues/2696#issuecomment-652762539 since the issue was closed. This is because with big-LITTLE and alike the CPUID result for `MIDR_EL1` is unstable and it depends on the core the code is...

yuyichao

Hadamard product?

27

Elementwise vector product (like dot, but without the reduction to one number) Does it exist? In MKL its vdMul, in cuBLAS its DHAD (so, not part of the standard BLAS...

personalityson

Issue with LAPACKE_sgesvd() on custom compiled v0.3.7 for Win64 (new x86_64-w64-mingw32 might be the cause)

66

Hi there. I have a wrapper over LAPACKE_sgesvd() that works well with supplied binary v0.2.19/20, custom compiled v.0.2.20 and supplied binary v0.3.7. However, the code doesn't work well with v0.3.7...

Arech

x86 binaries not compiled with common security flags

7

We tried to use x86 libopenblas.dll (v0.3.13 and v0.3.10) in our project. However, no version is compiled with the following security flags, see the errors from BinSkim below libopenblas.dll: error...

JiriH01

Tuning for Apple chips

38

OpenBLAS can now be built for Apple chips using the port at https://github.com/iains/gcc-darwin-arm64. The build succeeds and seems to run fine, so it might be time to think about tuning...

Keno

cblas_simatcopy: poor performance/avx512 instructions not supported

6

Good afternoon, I was trying to compare the cblas_simatcopy routine against intel-mkl equivalent and noticed this routine is performing very poorly. I would like to understand if these performance issues...

JoaoAlves95

Introduce TARGET fallbacks in CMake

12

X86(-64) targets for cross-compilation are likely to be for a simulator/testing and not a production environment. Regardless, we do not know information about the target yet, so choose a default...

xsacha

[WIP] Create a bunch of build tests

12

The build system is somewhat fragile. This script does builds using a bunch of different Makefile.rule settings, to help find bugs, regressions and corner cases in the build system. The...

TiborGY

[WIP] cblas_?gemm_batch

1

Implement clbas_?gemm_batch extension. Please check small_matrices branch and 88e6806e3f0199f4d94a8b9bdd164f2e0d1cfe25

xianyi