Thank you for your experiment.  I'm not surprised by the 
result but it is very nice to know that my expectations
are right.

I think that to a large extent you are seeing artifacts
of the questionable trade-offs that (reports tell me) the
ext* filesystems make.   With a different filesystem, the 
results would be very different.

I'm imagining a blob database containing may revisions of the linux
kernel.  It will contain millions of blobs.

It's fine that some filesystems and some blob operations work fine
on a directory with millions of files but what about other operations
on the database?   I pity the poor program that has to `readdir' through
millions of files.

That said: I may add an optional flat-directory format to my library,
just to avoid issues such as those you raise over the next couple 


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