testing with 3.1.0qa25 ,compilebench failed with nfs mount and 4 dht cluster setup.

./compilebench -D /mnt/io -i 2
using working directory /mnt/io, 2 intial dirs 100 runs
native unpatched native-0 222MB in 515.44 seconds (0.43 MB/s)
Traceback (most recent call last):
  File "./compilebench", line 567, in <module>
    dset = dataset(options.sources, rnd)
  File "./compilebench", line 319, in __init__
    self.unpatched = native_order(self.unpatched, "unpatched")
  File "./compilebench", line 103, in native_order
    rmrf(dirname)
  File "./compilebench", line 68, in rmrf
    os.rmdir(os.path.join(root, name))
OSError: [Errno 2] No such file or directory: '/mnt/io/native-0/sound/i2c/other'