[Paraview] How to use multiprocessing in pvpython?

[Sha Mo]

In order to use multi-core cpu well, I want to use multiprocessing module in paraview python script. But following error was occurred when I try to run following code on Paraview Python Shell:

import multiprocessing
pool = multiprocessing.Pool(processes=4)

paraview version 4.3.1
Process PoolWorker-1:
Traceback (most recent call last):
Process PoolWorker-2:
paraview: Fatal IO error 2 (No such file or directory) on X server :0.
  File "/usr/lib/python2.7/multiprocessing/process.py", line 249, in _bootstrap
Process PoolWorker-3:
paraview: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.
paraview: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.
Process PoolWorker-4:
paraview: Fatal IO error 2 (No such file or directory) on X server :0.
Process PoolWorker-5:
paraview: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.
Process PoolWorker-6:
paraview: Fatal IO error 2 (No such file or directory) on X server :0.
Process PoolWorker-8:
Process PoolWorker-7:
paraview: Fatal IO error 2 (No such file or directory) on X server :0.
paraview: Fatal IO error 2 (No such file or directory) on X server :0.
[xcb] Unknown sequence number while processing queue
[xcb] Most likely this is a multi-threaded client and XInitThreads has not been called
[xcb] Aborting, sorry about that.
paraview: ../../src/xcb_io.c:274: poll_for_event: Assertion `!xcb_xlib_threads_sequence_lost' failed.
Aborted (core dumped)

I wonder whether it is wrong way to use parallel programming on pvpython？
[SG50]
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