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Subject: Re: [OMPI users] Cannot create X11 window in Rank 0 node(master) ?
From: Ralph Castain (rhc_at_[hidden])
Date: 2009-06-30 06:59:09


Your cmd line specified that we are only to use the host "biggserver",
so all ranks will go there.

If you want ranks to go somewhere else, then you need to include that
location in your -host spec. See "man orte_hosts" for details.

On Jun 30, 2009, at 3:53 AM, Ashika Umanga Umagiliya wrote:

> Hi all,
>
> I have written mandelbrot rendering using X11.I have two nodes with
> OpenMPI.
>
> In my code, the rank 0 node(master) does the data collection from
> salves, Window creation using X11 and render the graph.(using
> XCreateSimpleWindow() ). Slave nodes calculate and send data to
> master.
>
> But when I execute my application by :
> #mpirun -np 4 -host biggserver ./mandel
>
> its gives error :
>
> "cannot connect to X server '(null)'"
>
>
> Isn't the rank 0 given to the machine which we initially run the MPI
> application?
> If so,why the application says it cannot connect to X server?Since
> rank 0 is my workstation?
>
> When I run this using a single node , it works well.
>
> Any tips?
>
> thanks in advance,
> umanga
>
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