<br><font size=2 face="sans-serif">Hello,</font>
<br>
<br><font size=2 face="sans-serif">I got ParaView 2.6 compiled with MPI
enabled, tested it locally (it works), and went to test it using a few
pvservers on the nodes in my cluster, and I see the splash screen, but
(paradoxically enough) an invisible window is created whose title in the
task bar is "unable to open display." This happens both physically,
from the cluster head node, and remotely from our control box (connects
to the head node via SSH with OpenGL-enabled X-forwarding). Looking
around at archives and searching online has only led me to one possible
cause, and that is that when the pvserver spawns the children servers,
they are not able to open an X display (for rendering purposes?). If they
are looking for an open display, they won't find them, because X is not
running (but it is installed and working) on each of the nodes. Looking
at the output of ps aux, I noticed something very interesting:</font>
<br><font size=2 face="sans-serif">foobar 3597 0.0
0.2 4440 2216 pts/14 S 14:27
0:00 | \_ /usr/bin/rsh n101 -l
foobar -n /usr/local/bin/pvserver cluster 36515 \-p4amslave \-p4yourname
n101 \-p4rmrank 1</font>
<br><font size=2 face="sans-serif">...</font>
<br><font size=2 face="sans-serif">foobar 3956 0.0
0.2 4440 2216 pts/14 S 14:27
0:00 | \_ /usr/bin/rsh n109 -l
foobar -n /usr/local/bin/pvserver cluster 36515 \-p4amslave \-p4yourname
n109 \-p4rmrank 9</font>
<br><font size=2 face="sans-serif">This uses RSH, which as far as I know
does not do X forwarding. What makes this interesting is that I cannot
find this remote shell command specified anywhere in the mpirun scripts
(they all use SSH by default), and this was verified by our MPI hello world
program:</font>
<br><font size=2 face="sans-serif">foobar 10621 1.2
0.2 4444 2220 pts/14 S 14:29
0:00 | \_ /usr/bin/ssh n101 -l
foobar -n /foo/bar/mpi/mpihw cluster 48369 \-p4amslave \-p4yourname n101
\-p4rmrank 1</font>
<br><font size=2 face="sans-serif">...</font>
<br><font size=2 face="sans-serif">foobar 10869 2.0
0.2 4440 2216 pts/14 S 14:29
0:00 | \_ /usr/bin/ssh n109 -l
foobar -n /foo/bar/mpi/mpihw cluster 48369 \-p4amslave \-p4yourname n109
\-p4rmrank 9</font>
<br>
<br><font size=2 face="sans-serif">My thought is that using SSH might allow
me to either (a) specify that X-forwarding is enabled by default (via the
ssh config file) or (b) once I figure out how to set it, I can specify
"/usr/bin/ssh -X -Y" as the remote shell command/options.</font>
<br>
<br><font size=2 face="sans-serif">I have been unsuccessful in locating
where pvserver determines to use rsh instead of ssh, as it is not specified
(from what I can tell) anywhere in the CMake configuration or in the build
files, and I cannot find in the documentation where this setting might
be located.</font>
<br>
<br><font size=2 face="sans-serif">My questions are as follows:</font>
<br><font size=2 face="sans-serif">1. Why is my pvserver trying to use
rsh when the default would appear to be ssh? Could this cause the problem
I am decribing?</font>
<br><font size=2 face="sans-serif">2. Are there any other ways for the
nodes to connect to a display without X-forwarding? (did I misconfigure
something?)</font>
<br><font size=2 face="sans-serif">3. If it should be using ssh and the
reason why it isn't is not obvious from my above description, what would
the next step be in determining my problem?</font>
<br>
<br><font size=2 face="sans-serif">Thanks,</font>
<br><font size=2 face="sans-serif">~Kyle</font>
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