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Python multiprocessing configuration fix on Centos

The OS I am running is 2.6.27-chistyakov.1 #1 SMP Tue Dec 29 10:26:29 PST 2009 x86_64 x86_64 x86_64 GNU/Linux. The Python multiprocessing module reported follow errors

File "/usr/lib/python2.6/multiprocessing/synchronize.py", line 49, in __init__
sl = self._semlock = _multiprocessing.SemLock(kind, value, maxvalue)
OSError: [Errno 38] Function not implemented

Turned out that we need to enable the SHM on the box. To do that, find the file /etc/fstab, add a new line

none /dev/shm tmpfs rw,nosuid,nodev,noexec 0 0

Restart the box and the SHM should be enabled now.