4 ms·

True, but for rsync's case of setting the mtime of a file, performance of this logic is utterly insignificant.

• bayindirh 8y ago
  "Everything is fast for small n." -Knuth. While syncing some million files, I'm sure it'll have an impact tho. P.S.: Yes, we use it for a million files, regularly.
  • blibble 8y ago
    it's probably not noticeable for a million files the syscall is going to be many, many orders of magnitude slower than the difference between a direct and an indirect call
  • vortico 8y ago
    With trivial method() functions, you could speed through that loop a million times in a millisecond.
  • bayindirh 8y ago
    IIRC, switch statements bigger than a certain sizes are compiled to jump tables. So it's just a static jump after the code finds a working method. In theory, it's a very cheap piece of assembly after that point.