3 ms·

If we actually got sparse from mmap, it's all zeros, and if it has nonzero numbers in it, it's because we previously wrote them. Seems like you only catch nasal

If we actually got sparse from mmap, it's all zeros, and if it has nonzero numbers in it, it's because we previously wrote them. Seems like you only catch nasal demons if you make the mistake of calling malloc.

ahoka 3y ago
Yes, this is actually a good solution.
gpderetta 3y ago
or use calloc. Or just zero the whole buffer the first time: both mmap and calloc will have to zero on first use anyway, but future resets won't need zeroing. Or use optimization barriers as described elsethread.