CFD Online Discussion Forums - [General] Running ParaView on multiple cores

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Running ParaView on multiple cores

I am unable to run ParaView in parallel on one of our workstations. Running it on a single core works perfectly.

The operating system is OpenSuse 12.3.
The versions of Paraview I tried are 3.98 and 4.1 RC1.
The workstation is a 2-CPU machine with 2 Xeon E5-2687W processors, so it should be able to run applications in parallel.

When I activate the "use multi-core" option and restart PV, I get the following error messages in the command shell:

Code:

AutoMPI: SUCCESS: command is:

 "/usr/Paraview/ParaView-4.1.0-RC1-Linux-64bit/lib/paraview-4.1/mpiexec" "-np" "2" "/usr/Paraview/ParaView-4.1.0-RC1-Linux-64bit/lib/paraview-4.1/pvserver" "--server-port=40062"

AutoMPI: starting process server

-------------- server output --------------

ssh: Could not resolve hostname P-H-287-20LIX.site: Name or service not known

AutoMPI: server never started.

vtkProcessModuleAutoMPIInternals: Server never started.

Generic Warning: In /home/utkarsh/Dashboards/MyTests/NightlyMaster/ParaViewSuperbuild-Release/paraview/src/paraview/ParaViewCore/ServerManager/Core/vtkSMSession.cxx, line 315

Failed to automatically launch 'pvserver' for multi-core support. Defaulting to local session.

From PV, I get the output message:

Quote:

Generic Warning: In /home/utkarsh/Dashboards/MyTests/NightlyMaster/ParaViewSuperbuild-Release/paraview/src/paraview/ParaViewCore/ServerManager/Core/vtkSMSession.cxx, line 315
Failed to automatically launch 'pvserver' for multi-core support. Defaulting to local session.

Strange enough, I have no problems running the same versions of PV in parallel on a different workstation operating OpenSuse 11.4.
What can I do to get it running?

Hi Alex,

Sorry, I was the one that had requested you to ask this here and I didn't manage to look into this sooner.

OK, lets try to diagnose this. My first guess is that your machine in question has got the host name "P-H-287-20LIX.site", but no IP is assigned to that name. To check this, run:

Code:

ping P-H-287-20LIX.site

Use Ctrl+C to abort. To compare with something similar to what you should be seeing, run:

Code:

ping 127.0.0.1

If it does not show a similar output, then the problem is as I guess, where there is no IP address assigned to that host name.
If this is the case, then (as root) edit the file "/etc/hosts" and add this line to the end:

Code:

127.0.0.1 P-H-287-20LIX.site

Save and close the file. Then back as normal user (not as root), try running ParaView once again.

Best regards,
Bruno

Hi Bruno, thanks for your reply. I knew you did not forget about this.

Well first of all, your guess was correct. Adding the name of the system to the host list did the trick.
But I have an additional question concerning this issue.
On the other system I mentioned, the entry in /etc/hosts reads

Code:

127.0.0.2 P-H-287-04.LIX.site P-H-287-04.LIX

Obviously, the name of this system is "P-H-287-04.LIX". I was just wondering about the different IP-address here although localhost still has "127.0.0.1"
Sorry if this is more of a linux question, but there are no experts at my university.

Hi Alex,

Ah, I meant to write about that, but thought that it was too much information :)

So, the "127.0.0.*" IP addresses are usually all part of the loopback mechanism: http://en.wikipedia.org/wiki/Loopbac....28TCP.2FIP.29

Therefore, you can use any or all values from 1 to 254 for the last number! At least in theory :) For example, all of these are part of the loopback system:

Code:

127.0.0.1

127.0.0.2

127.0.0.3

...

127.0.0.39

127.0.0.40

127.0.0.41

...

127.0.0.102

127.0.0.103

127.0.0.104

....

127.0.0.253

127.0.0.254

The ellipsis are just so that I wouldn't have the bad idea to write all of the 254 possible addresses :D

Oh, as for the names to the right of the IP address: I don't know if there is a limit, but you can write there any and all names you want to associate to said IP address, for example:

Code:

127.0.0.5 cookies.com milk.net tea.it home.local out.of.ideas

:)

Best regards,
Bruno

Thank you, I really appreciate your help.

hello,Alex and wyldckat
I also want to parallel run paraview. I work with a server (24 cores).
I have tried some methods, but it faild.
Can you share me the detail procedures on how to running paraview on multi cores? Thanks.

It would be better to start a new thread, even if the problem appears to be similar in the first place.
Try again and provide more information.