hans added a comment.

In http://reviews.llvm.org/D21113#452558, @thakis wrote:
> Can you try building a few more files? Say, v8_base?


Well, that was depressing:

  Putting the sdk on a vfat fs:
  real    2m26.077s
  user    68m31.476s
  sys     1m25.702s
  
  Using the flag:
  real    9m5.179s
  user    69m3.417s
  sys     212m47.136s  <--- !
  
  Using the flag with bloom filters:
  real    3m1.046s
  user    69m5.328s
  sys     19m4.368s

It seems the filesystem wasn't so happy about 32 processes doing a lot of 
readdir() at the same time.


http://reviews.llvm.org/D21113



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