OpenBLAS

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CMake install cannot find libopenblas.a when using the Xcode generator

31

I'm building for iOS armv8 sdk 13.04 and 14.4, macos armv8 sdk 11.1 builds via conan: cmake -G ""Xcode"" -DCMAKE_TOOLCHAIN_FILE="conan_toolchain.cmake" -DCMAKE_INSTALL_PREFIX="OpenBLAS" -DNOFORTRAN="ON" -DBUILD_WITHOUT_LAPACK="ON" -DBUILD_LAPACK_DEPRECATED="OFF" -DBUILD_TESTING="OFF" -DUSE_THREAD="ON" -DMSVC_STATIC_CRT="OFF" -DBUILD_STATIC_LIBS="ON" -DBUILD_SHARED_LIBS="OFF" -DONLY_CBLAS="1"...

heyleadro

drotg implementation is not up to date with the reference BLAS

3

The Reference BLAS changed their `DROTG` implementation in https://github.com/Reference-LAPACK/lapack/pull/527 to use a safe scaling. In Gonum we updated our implementation and tests accordingly in https://github.com/gonum/gonum/issues/1623. Unfortunately, the updated tests with...

vladimir-ch

for issue #4051 (probably requires the conan toolchain file mentioned therein)

martin-frbg

Release OpenMP resources in blas_thread_shutdown

4

OpenMP 5.0 gained an [`omp_pause_resource_all`](https://www.openmp.org/spec-html/5.0/openmpsu153.html) function designed to release the locks before `fork`ing the process. The parameters are described in the [`omp_pause_resource`](https://www.openmp.org/spec-html/5.0/openmpsu152.html) function. Using this function makes it possible for...

aitap

for #4064

martin-frbg

Otherwise non-threaded applications may use signals in a way that is currently affected by OpenBLAS launching threads. For example, it is not uncommon for an application main loop to block...

peadar

OpenBLAS with Pthreads can cause CPU contention for MPI programs with Pthreads

5

I think this issue is broadly similar to https://github.com/xianyi/OpenBLAS/issues/2543, but [I was asked](https://twitter.com/KroekerMartin/status/1654385589762895872?t=4kFRi3B8pYtWD0oV4Jtozw&s=19) to provide a bug report for this. **TL;DR: Running MPI programs with pthreads and OpenBLAS can cause...

joerowell

Improving performance with WebAssembly

12

Thanks to the discussions and fixes in https://github.com/xianyi/OpenBLAS/issues/3640 and follow up work by @lesteve and @ogrisel we now have a build of OpenBLAS with emscripten for WebAssembly in Pyodide. It...

rth

Document the various environment variables used, including the new OPENBLAS_DEFAULT_NUM_THREADS

1

I was intrigued by the mention of `OPENBLAS_DEFAULT_NUM_THREADS` and looked around for what it does. My goto place for this is the FAQ page in the wiki, but I could...

mattip

Performance variability

13

I am observing a lot of performance variability for matrix multiplication in sizes ranging from ~100 to ~1000 I have been investigating this without a lot of success. The timing...

juanjosegarciaripoll