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--- howto:visit [2017/12/01 08:29]
ccrosby
+++ howto:visit [2018/12/18 16:05] (current)
ccrosby [Running VisIt]
@@ Line 1: / Line 1: @@
 ====== Running VisIt ======
-There are two versions of VisIt installed on Lengau.  Visit-2.10.2 is installed in ''/apps/chpc/compmech/CFD/VisIt/visit2.10.2/src/bin''.  Visit-2.13.2 is installed in ''/apps/chpc/compmech/visit2_12_3.linux-x86_64''.  Both versions are available as modules.  Use the command ''module avail'' to find it.   Please refer to the [[https://wci.llnl.gov/simulation/computer-codes/visit/|VisIt web site]] for more information on VisIt.  For interactive graphics, an OpenGL-enabled environment will be required, therefore refer to the page on [[howto:remote_viz|Remote Visualization]] for instructions on setting up a connection to the visualization node, and running VisIt with the VirtualGL wrapper. VisIt is an extremely versatile post-processor, and can be used as the primary visualization tool for a very wide range of applications and file formats.
+There are three versions of VisIt installed on Lengau:
+  - Visit-2.10.2 is installed in ''/apps/chpc/compmech/CFD/VisIt/visit2.10.2/src/bin''
+  - Visit-2.12.3 is installed in ''/apps/chpc/compmech/visit2_12_3.linux-x86_64''
+  - Visit-2.13.3 is installed in ''/apps/chpc/compmech/visit2_13_3/visit2_13_3.linux-x86_64'' (non-mesa) and ''/apps/chpc/compmech/visit2_13_3.linux-x86_64'' (with mesa)
+All three versions are available as modules.  Use the command ''module avail'' to find it.   Please refer to the [[https://wci.llnl.gov/simulation/computer-codes/visit/|VisIt web site]] for more information on VisIt.  For interactive graphics, an OpenGL-enabled environment will be required, therefore refer to the page on [[howto:remote_viz|Remote Visualization]] for instructions on setting up a connection to the visualization node, and running VisIt with the VirtualGL wrapper. VisIt is an extremely versatile post-processor, and can be used as the primary visualization tool for a very wide range of applications and file formats.
 ===== Running VisIt on a visualization node =====
-It is possible to run a VisIt client on your local workstation, with the data and render processing happening on a cluster node.  However, is is easier to use one of the visualization nodes (chpclic1 or chpcviz1) to run the interface.  In order to do this, load the module ''chpc/compmmech/VisIt/2.12.3-VNC'', and start VisIt with the command ''vglrun visit''.  This will get you a serial version of VisIt, which is adequate for processing smaller data sets.
+It is possible to run a VisIt client on your local workstation, with the data and render processing happening on a cluster node.  However, is is easier to use one of the visualization nodes (chpclic1 or chpcviz1) to run the interface.  In order to do this, load the module ''chpc/compmech/VisIt/2.12.3-VNC'', and start VisIt with the command ''vglrun visit''.  This will get you a serial version of VisIt, which is adequate for processing smaller data sets.
 ==== VisIt on a viz node with the compute engine on a compute node ====
-In order to visualize large data sets effectively,
+In order to visualize large data sets effectively, add one or more compute nodes. For VisIt to be able to start the remote compute engine on a compute node, three modules need to be loaded by default, which is most easily achieved by inserting these three lines in your ~/,bashrc file:
+<code>
+module load gcc/6.1.0
+module load chpc/compmech/mpich/3.2/gcc-6.2.0
+module load chpc/compmech/mesa/17.0.1
+</code>
+However, the mesa module will clash with the VNC implementation of VisIt, therefore you will need to unload it in your VNC session before starting VisIt.
+Now start VisIt in your VNC-session, as per usual.  To get access to a full compute node, start an interactive PBS session:
+<code> qsub -I -X -l select=1:ncpus=24:mpiprocs=24 -l walltime=4:00:00 -q smp -P MECH1234 </code>
+Note down the hostname of the compute node assigned to you.  In this case, it is cnode0756.
+In VisIt, go to the ''Options - Host Profiles'' menu and fill in the necessary details as per this example
+{{:howto:visithost.png?nolink |}}
+Click Apply, and then set up an appropriate parallel host profile:
+{{:howto:visithostprofile.png?nolink |}}
+Click Apply and dismiss the form.
+Now go to the ''File - Open'' menu:
+{{:howto:visitopenfiles.png?nolink |}}
+Change the host from localhost to your compute node, and if all goes well, you can select the appropriate data file on the compute node.
+{{:howto:visitopenfiles2.png?nolink |}}
+You are then given the option of selecting the number of parallel processes you want to use on the compute node:
+{{:howto:visitopenfiles3.png?nolink |}}
+From here onwards proceed as usual.  Note that you will only get parallel acceleration if your data set is parallel.

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