Lighttpd

server.state-cache-engine

stat() system call caching.

lighttpd can utilize FAM/Gamin to cache stat call.

possible values are:  disable, simple or fam.

disable
  no stat() call is cached (a single request might result in 3-4 stat() calls)
  If your files are changing in size alow, you might have to have the stat-cache
  disabled

simple (default)
  cache each stat() call for one second.

fam   
  if FAM or gamin are installed and lighty is linked against those libraries you
  can use them to control the freshness of the stat-cache.

{{{
server.stat-cache-engine = "simple" 
}}}