linux - Maximum number of files in one ext3 directory while still getting acceptable performance?

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I have an application writing to an
ext3 directory which over time has grown to roughly three million files. Needless to
say, reading the file listing of this directory is unbearably
slow.

I don't blame ext3. The proper
solution would have been to let the application code write to sub-directories such as
./a/b/c/abc.ext rather than using only
./abc.ext.

I'm changing
to such a sub-directory structure and my question is simply: roughly how many files
should I expect to store in one ext3 directory while still getting acceptable
performance? What's your experience?

Or in other
words; assuming that I need to store three million files in the structure, how many
levels deep should the ./a/b/c/abc.ext structure
be?

Obviously this is a question that cannot be
answered exactly, but I'm looking for a ball park estimate.

Answer

Provided you have a distro that supports the dir_index
capability then you can easily have 200,000 files in a single directory. I'd keep it at
about 25,000 though, just to be safe. Without dir_index, try to
keep it at 5,000.

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