I don't know that case, but in my case, one process thrashing it's
read-ahead window is twice as fats as 16 processes doing so ;)
I wother wether these problems can be fixed at all, with all these
different situations where the vm behaves totally different in (seemingly)
similar cases.
-- 
      -----==-                                             |
      ----==-- _                                           |
      ---==---(_)__  __ ____  __       Marc Lehmann      +--
      --==---/ / _ \/ // /\ \/ /       pcg@goof.com      |e|
      -=====/_/_//_/\_,_/ /_/\_\       XX11-RIPE         --+
    The choice of a GNU generation                       |
                                                         |
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