Created attachment 580220 [details] the output of emerge --info Numpy cannot detect CBLAS while compiling numpy.core.multiarray. Gentoo parses cblas.pc while the host is trying to emerge dev-python/numpy with USE:lapack enabled. The ebuild uses `pkg-config --cflags-only-I cblas` to detect the 'include_dirs' to be added in 'site.cfg' of numpy, which causes the problem. This command will print nothing, if I'm using cblas-reference as my cblas provider, because -I/usr/include is enabled by default. But numpy detects cblas interface by: "obj = c.compile([src], output_dir=tmpdir, include_dirs=self.get_include_dirs())", where 'self.get_include_dirs()' will return None, since site.cfg defines 'include_dirs' with nothing. (https://github.com/numpy/numpy/blob/master/numpy/distutils/system_info.py#L1893) The variable 'src' is a source file which contains a cblas function. The compilation will fail, since the compiler cannot find <cblas.h>. Then numpy will think there is no CBLAS while compiling numpy.core.multiarray, then fallback to its own implementation. As far as I know, it will affect numpy.matmul(), and make numpy.matmul() very slow. Whether the multiarray module is compiled with CBLAS can be checked out by: ``` ldd /usr/lib64/python3.6/site-packages/numpy/core/multiarray.cpython-36m-x86_64-linux-gnu.so ``` So the soluton is to add a valid include_dir, then the CBLAS-detection will not fail, and numpy.matmul() will use cblas instead of numpy's implementation. I'll provide a numpy-1.14.5.patch, which seems to solve the problem, and my system infomation. Hope they will help.
Created attachment 580222 [details, diff] the patch created by me. It should solve the problem.
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=f5c71a4aa9615c8c14caa8e7076519ab2a4b9824 commit f5c71a4aa9615c8c14caa8e7076519ab2a4b9824 Author: Benda Xu <heroxbd@gentoo.org> AuthorDate: 2019-06-23 12:46:21 +0000 Commit: Benda Xu <heroxbd@gentoo.org> CommitDate: 2019-06-23 12:47:37 +0000 dev-python/numpy: fix cblas detection. Drop old ebuilds versionator eclass. Drop live ebuild. It has not been taken care of since numpy-1.9. Suggested-By: Zongyu Zhang <zzy2529420793@gmail.com> Closes: https://bugs.gentoo.org/647072 Closes: https://bugs.gentoo.org/688392 Package-Manager: Portage-2.3.52, Repoman-2.3.12 Signed-off-by: Benda Xu <heroxbd@gentoo.org> dev-python/numpy/Manifest | 16 -- .../files/numpy-1.10.2-no-hardcode-blas.patch | 64 -------- .../files/numpy-1.12.1-no-hardcode-blas.patch | 72 --------- .../numpy/files/numpy-1.8.0-no-hardcode-blas.patch | 25 --- .../numpy/files/numpy-1.9.2-no-hardcode-blas.patch | 35 ----- dev-python/numpy/numpy-1.10.4.ebuild | 154 ------------------- dev-python/numpy/numpy-1.13.3.ebuild | 167 --------------------- dev-python/numpy/numpy-1.14.5.ebuild | 3 +- dev-python/numpy/numpy-1.15.4.ebuild | 3 +- dev-python/numpy/numpy-1.16.1.ebuild | 3 +- dev-python/numpy/numpy-1.8.2.ebuild | 145 ------------------ dev-python/numpy/numpy-1.9.2.ebuild | 146 ------------------ dev-python/numpy/numpy-9999.ebuild | 134 ----------------- 13 files changed, 6 insertions(+), 961 deletions(-)
