[Paraview] GNOME is hanging with co-processing ...

[Ufuk Utku Turuncoglu (BE)]

Hi,

I am trying to run a parallel code with co-processing support but when i 
run the code, it is hanging without opening x-window and writing the png 
files. In this case, i could not use or interact with any other app with 
GUI such as firefox, terminal etc. It seems that it affects the GNOME. 
On the other hand, if i connect to machine remotely via ssh and kill the 
MPI process than the machine back to the normal and i could interact 
with terminal and other apps with GUI nornally. The system has Centos 
(7.1) operating system along with ParaView 5.2.0RC3 (BTW, i compiled 
ParaView from source). In this case, i am just running the code with 
standard mpirun command as follows,

mpirun -np 16 ./main.x

to find the source of the problem, i included strace command to the 
mpirun like following

mpirun -np 16 strace ./main.x

and it runs without any problem and produces desired output. So, at this 
point i am little bit confused and i just wonder that is there anybody 
else had similar issue before. Strace somehow solves the problem but i 
don't know how. It seems that it is related with the system because same 
code runs without any problem under MacOS. I also compiled code with 
ParaView 5.1 and it also hangs. The standard allinputsgridwriter.py is 
working without any problem and writes the data to disk. So, somehow it 
is related with the system (probably GNOME) or the ParaView installation.

Another question is that is there any way to prevent opening x-window 
and still getting advantage of having GPU in this case? The code only 
writes the result in png format. So, i need installation for headless 
server (without any screen attached) but i am not sure. I think that it 
requires special configuration options for the ParaView installation. 
So, please let me know also about those special options.

Regards,

--ufuk