[dfranke]

That's what mmap is for.

[haydnv]

It might be possible to replace freqfs with mmap on a POSIX OS, but a) you would still have to implement your own read-write lock, and b) you would (I think probably?) lose some consistency in behavior across different host operating systems.

[vlovich123]

Which OSes does this run on that doesn’t have some kind of mmap operation?

[gpderetta]

mmaps for read, explicit API for writing, a-la LMDB. Buggy readers can read inconsistent data but cannot corrupt the os.