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Diffstat (limited to 'doc/release/1.14.0-notes.rst')
| -rw-r--r-- | doc/release/1.14.0-notes.rst | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/doc/release/1.14.0-notes.rst b/doc/release/1.14.0-notes.rst index 0bcb3e4a2..98d58df97 100644 --- a/doc/release/1.14.0-notes.rst +++ b/doc/release/1.14.0-notes.rst @@ -217,6 +217,17 @@ selected via the ``--fcompiler`` and ``--compiler`` options to supported; by default a gfortran-compatible static archive ``openblas.a`` is looked for. +``numpy.save`` aligns data to 64 bytes instead of 16 +---------------------------------------------------- +Saving NumPy arrays in the ``npy`` format with ``numpy.save`` inserts +padding before the array data to align it at 64 bytes. Previously +this was only 16 bytes (and sometimes less due to a bug in the code +for version 2). Now the alignment is 64 bytes, which matches the +widest SIMD instruction set commonly available, and is also the most +common cache line size. This makes ``npy`` files easier to use in +programs which open them with ``mmap``, especially on Linux where an +``mmap`` offset must be a multiple of the page size. + Changes ======= |