One last note: doing fdatasync once, before fadvise+fsync, not after every
write is ~10x faster:
`
FDIO: 30 writes, 3763601 total bytes in 0.003558 secs
FDIO: 1 allocs, 3763601 total bytes in 0.000024 secs
FDIO: 1 dsyncs, 0 total bytes in 0.074081 secs
FDIO: 1 syncs, 0 total bytes in 0.005785 secs
`
That makes the best case ~17x slower than using the kernel caches. A cost of
17x is almost tolerable in RPM for the benefits of having files written to disk
and not blowing out the kernel caches.
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