[Paraview] How to use multiprocessing in pvpython?

[Cory Quammen]

It looks like all threads are attempting to open a display on an xserver
but Xlib has not been initialized to use multiple threads.

Interestingly, I can execute your code in my development build of pvpython
just fine under Ubuntu 14.04.

May I ask what you are planning to do with the multiprocessing package?
Maybe there is another way you can accomplish it without the
multiprocessing package?

- Cory

On Wed, Jul 8, 2015 at 10:05 PM, Sha Mo <mosha at ntu.edu.sg> wrote:

> 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？
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-- 
Cory Quammen
R&D Engineer
Kitware, Inc.
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