How many files can I put in a directory?

Question

Does it matter how many files I keep in a single directory? If so, how many files in a directory is too many, and what are the impacts of having too many files? (This is on

Answer 1

I've been having the same issue. Trying to store millions of files in a Ubuntu server in ext4. Ended running my own benchmarks. Found out that flat directory performs way better while being way simpler to use:

Wrote an article.