That’s strange. I see the package, and pixi also seems to solve with that requirement for osx just fine…
https://anaconda.org/conda-forge/libblas/files
lists the package that I think we want here: osx-arm64/libblas-3.9.0-22_osxarm64_openblas.conda
I pushed a change to the pixi repo that hopefully should work on osx-arm. Could you try if that works?
It needs pixi installed (for instance brew install pixi if you are using brew) and then
git clone https://github.com/aseyboldt/tmp-benchmark-rethink.git
cd tmp-benchmark-rethink
pixi run --environment openblas-new run-benchmarks
pixi run --environment openblas-old run-benchmarks
Should run the benchmark with an old and a new pymc, using openblas in both.