Antoine Pitrou added the comment: > What is the alignment of a cacheline? Can a line starts at any > address?
If it could, Raymond wouldn't be asking for this feature ;-) Cachelines are typically aligned at whatever their size is. So, a 64-byte cacheline will be aligned at a 64 bytes boundary. Perhaps some CPUs operate differently, but mainstream CPUs are generally like that (for good reason: a cache is much simpler to implement if there can't be some overlapping between cache lines). > Do you have an idea of performance benefit of memory alignment? > > Adding yet another API to allocate memory has a cost. Agreed. Aligned memory allocation is useful if your *algorithms* benefit from alignment (e.g. some SIMD-optimized code, or something relying on page tables). But aligning every data structure on a cacheline boundary doesn't sound like a very good idea: if it was, the system allocator would do it for you, IMHO ;-) ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue18835> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
