[Paraview] Re: General X window issue when running paraview server

[谢鸿飞]

There is a way about how to get X windows be opened when running
pvserver on a PC cluster.
If you use two pc as the pvserver, and the mpi can be run on the two pc, the only problem is you can’t run pvserver with tiled display.
Do the following step:
1)	if the two server PCs name is name1 and name2, and on the two PCs have the same user’s name is node1, and name1’s IP is 202.189.9.22, name2’s IP is 202.189.9.23, respectively
2)	On the Linux’s system of name1, under /home/node1 have a .bashrc file. You add two line like this  
 export DISPLAY=202.189.9.22:0.0  
          xhost +
The name2 PC configure like the PC1
 export DISPLAY=202.189.9.23:0.0  
          xhost +


    fhxie

> All,

> 

> There is a general issue about how X windows get opened when running

> pvserver on a PC cluster. Normally X windows will not allow an x window

> to be opened if you are not 'logged into the display (console)'. So if I

> set my DISPLAY to :0.0 and I run an mpi job that simply launches

> 'xclock' on 4 different nodes. I will generally get some sort of X error

> like... "bad X server connection" or whatever.

> 

> This is because the X server is not allowing an X window to be opened

> from someone who is not 'on the console'. This is the normal behavior of

> an X server. You have to 'bypass' the security feature in order to open

> an X window. How you do this is an 'advanced' topic and hopefully you

> have a cluster administrator that can help you out with this.

> 

> If you do not have an administrator that can do this for you, then let

> me know and I can get our cluster guy to give me a list of the

> configuration changes made to the X server to allow windows to be opened

> by folks not on the console.

> 

> Also, do not under any circumstances have your DISPLAY variable set to

> anything other than localhost:0.0 (or equiv) when running pvserver. If

> you set your DISPLAY variable to any other machine besides localhost you

> have completely crippled pvserver. ParaView will have to send X traffic

> from one node to another and the whole purpose behind the system design

> will be completely bypassed and your performance will probably be 100x

> slower.

> 

> Brian Wylie - Org 9227

> Sandia National Laboratories

> MS 0822 - Building 880/A1-J

> (505)844-2238 FAX(505)845-0833                       

>      ____                  _    __

>     / __ \____  _________ | |  / (_)__ _      __ 

>    / /_/ / __ `/ ___/ __ `/ | / / / _ \ | /| / /

>   / ____/ /_/ / /  / /_/ /| |/ / /  __/ |/ |/ /

>  /_/    \__,_/_/   \__,_/ |___/_/\___/|__/|__/

> 

>                                     Unleash the Beast

>  

> 

> > -----Original Message-----

> > From: Nancy [mailto:haifang_zhou at 163.com] 

> > Sent: Wednesday, May 11, 2005 9:02 PM

> > To: Wylie, Brian

> > Subject: Re: [Paraview] Is it possible to run the paraview in 

> > C/S mode on different OS platform?

> > 

> > Dear Wylie,

> >      Thanks for your help! I have run the paraview in C/S 

> > mode on two machines with Windows and Linux OS succesfully.

> >      But there are still some questions needing your explaining. 

> >     " If your cluster is setup to allow that your done. If 

> > not you will need to compile paraview with mesa and then the 

> > X window thing is not an issue."  I can not unterstand these 

> > two sentences. What is "mesa"? Can you explain this problem 

> > for me in detail?

> > 

> > Best,

> > Nancy

> > 

> > 

> > 

> > ----- Original Message -----

> > From: "Wylie, Brian" <bnwylie at sandia.gov>

> > To: "Nancy" <haifang_zhou at 163.com>; <paraview at paraview.org>

> > Sent: Wednesday, May 11, 2005 10:14 PM

> > Subject: RE: [Paraview] Is it possible to run the paraview in 

> > C/S mode on different OS platform?

> > 

> > 

> > Nancy,

> > 

> > Sure we do it all the time. There are issues sometimes with how the

> > connection works. Lots of time when you run on a linux server you do a

> > 'qsub' or equivalent and you don't know which nodes you will actually

> > get and even when you know which nodes you will get, your 

> > client machine

> > will not be able to connect 'into' that particular node. 

> > 

> > BUT, this is all solved by doing -rc (reverse connect) on both the

> > server and client. So you launch the client on windows with 

> > -rc (you can

> > make a shortcut to pvclient and add the -rc arg in the 'properties' of

> > the shortcut).

> > After the client is running you launch the server with -rc and that

> > client machine name as -ch arg.

> > 

> > Regarding the server not having graphics cards that is also just fine.

> > Any machine these days will run openGL even if they don't have a

> > graphics card in them. The one wrinkle is that paraview server

> > (pvserver) will normally open up an X window to do the parallel

> > rendering. If your cluster is setup to allow that your done. 

> > If not you

> > will need to compile paraview with mesa and then the X window thing is

> > not an issue.

> > 

> > We do not ever use paraview as a data server. We always use just the

> > vanilla (pvclient-pvserver) and the servers do both data handling and

> > rendering (even on machines with mesa) and then stream images to the

> > client desktop. We find this model works really well. I know 

> > other folks

> > that use data servers and renders servers but they are just weird and

> > should receive some sort of medical attention. (Of course I'm being

> > silly, but I do have strong opinions about why that mode of 

> > operation is

> > not a good idea for most use cases).

> > 

> > Anyway, if you have any questions just let me know.

> > 

> > Best regards, 

> > 

> > Brian Wylie - Org 9227

> > Sandia National Laboratories

> > MS 0822 - Building 880/A1-J

> > (505)844-2238 FAX(505)845-0833                       

> >      ____                  _    __

> >     / __ \____  _________ | |  / (_)__ _      __ 

> >    / /_/ / __ `/ ___/ __ `/ | / / / _ \ | /| / /

> >   / ____/ /_/ / /  / /_/ /| |/ / /  __/ |/ |/ /

> >  /_/    \__,_/_/   \__,_/ |___/_/\___/|__/|__/

> > 

> >                                     Unleash the Beast

> >  

> > 

> > > -----Original Message-----

> > > From: paraview-bounces+bnwylie=sandia.gov at paraview.org 

> > > [mailto:paraview-bounces+bnwylie=sandia.gov at paraview.org] On 

> > > Behalf Of Nancy

> > > Sent: Tuesday, May 10, 2005 6:32 PM

> > > To: paraview at paraview.org

> > > Subject: [Paraview] Is it possible to run the paraview in C/S 

> > > mode on different OS platform?

> > > 

> > > Hi, all,

> > >     Now we have a server machine with multiple processors 

> > > that use Linux OS, and we want to use a PC with Windows XP as 

> > > the client. Is it possible to run the paraview in C/S mode on 

> > > different OS platform?

> > >     By the way, if the server machine dose not have graphic 

> > > card and display device, can the Render server and Data 

> > > server of Paraview run on this machine?

> > >     Thanks a lot!

> > > 

> > > Best,

> > > Nancy

> > > 

> > 

> > 

> 

> 

 



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