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Old 09-14-2017, 10:26 AM   #1
chiendarret
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Registered: Mar 2007
Posts: 229

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Accessing remote visualization from the cluster


Hallo:
I can't anymore build a virtual screen from the remote cluster. I use a python script that worked well before with Debian8 amd64. Now, I am in Austria with a VAIO with Debian9 amd64 and apparently with this version a library is not found:

:~/servers/cineca/RCM_remote_visualization$ ./RCM_linux_64bit
Traceback (most recent call last):
File "<string>", line 10, in <module>
File "/home/vagrant/devel/RCM/multivnc/PyInstaller/PyInstaller-2.1/PyInstaller/loader/pyi_importers.py", line 270, in load_module
File "/tmp/build/rcm_client_tk/out00-PYZ.pyz/Tkinter", line 39, in <module>
File "/home/vagrant/devel/RCM/multivnc/PyInstaller/PyInstaller-2.1/PyInstaller/loader/pyi_importers.py", line 409, in load_module
ImportError: /usr/lib/x86_64-linux-gnu/libX11.so.6: undefined symbol: xcb_poll_for_reply64


On the other hand, X11 works very well on VAIO. I run update/upgrade at no help. Also, "apt -f install" does not show any problem with the installed packages. From Internet, this type of error is reported for Debian9, not for 8. I posed the problem on the amd64 Debian web site, getting no answer.Thanks for advice

chiendarret
 
Old 09-23-2017, 12:18 PM   #2
chiendarret
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Registered: Mar 2007
Posts: 229

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Rep: Reputation: 15
I did myself some thoughts to the obstacle, getting clear that the RCM script uses an old version of libX11.so.6, dated to the debian8 times. It is also clear that RCM should be recompiled for the new library, present in debian9. Why the computing center does not do that? To get an answer you have to think to the competition between nvidia and intel, now being an acute war as remote visualization is the future of high tech computing in more and more areas. It is clear that the computing center is moving away from nvidia towards intel, abandoning any GPUs. The cost from that war to the scientist is very high, and not only in remote visualization. Ultimately, the cost goes to the society.

For the time being, the only resort for me will be providing debian9 with also the older version of libX11.so.6. Something risky for scientists, like myself, in other areas than computing science.Could that be done in a chroot? If so, it would relieve from risks of getting an unusable OS. Should someone know how to to that, it would help if details are provided. Linux flavors have become very sensitive, with their meta-packages and automatic processes. I preferred the time when debian was difficult to install, but, when done, it allowed anything.

chiendarret
 
  


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