I'm running into a weird performance problem with LMDB. Every once in a
while, when iterating over the whole thing, I'll have a major slowdown. I
go from 70k records per second, down to between a hundred and a few
thousand records per second. This usually continues for the entire read,
however, *sometimes* if I restart the python kernel or restart the script,
it will go back into high speed mode. I don't have any idea what might be
The machine is a shared machine, so it could be a resources thing, though a
cursory look at htop doesn't show excessive memory pressure or cpu usage.
Any ideas? Places to look? I don't know how to investigate a memory
mapping performance issue... any suggestions?