Has anyone studied the impact of converting the pack idx fanout table
from 256 entries to 65536 entries?
Back of the envelope estimates for 3.1M objects in linux.git suggests
a 2^16 fanout table would decrease the number of binary search
iterations from ~14 to ~6. The increased table costs an extra 255 KiB
of disk. On a 70M idx file this is noise.
I'm starting to wonder if increasing the fanout table once the object
count is above a certain threshold is a reasonable optimization for
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