====== Paraview ======
Paraview is only installed on the cluster as //pvserver// for Server-Client connections.

**NOTE: The versions of Paraview on the Server and Client side must be identical!**
Currently, versions **5.10.1** and **5.12.1** are available on the cluster (Server) side ([[en:computing:cluster:software:moduly|modules]] "paraview/5.10.1" and "paraview/5.12.1"). This version can be freely downloaded for your computer (Client) at [[https://www.paraview.org/download/|Paraview-download]]. Older version 5.10.1 is kept for its compatibility with openfoam-org/12, it is also native for OS Ubuntu 22.04.

==== Starting on the server side ====
The **SSH** login must be done **with graphics support**, i.e. the //-Y// switch (Windows users, see. [[computing:cluster:pripojeni:start|cluster/connections]])
  ssh -Y user@kraken
After loading the module
  [user@kraken ~]$ ml paraview
//pvserver// can be started on the admin node
  [user@kraken ~]$ srun -p NoCompute pvserver
even in parallel in the //NoCompute// queue directly from the command line
  [user@kraken ~]$ srun -p NoCompute -n 4 pvserver
or by using the script for "sbatch":

  #!/bin/bash
  
  #SBATCH --job-name=Paraview_test
  #SBATCH --output=slurm_out.txt
  #SBATCH -p NoCompute
  #SBATCH -N 1
  #SBATCH -n 4
  
  ml paraview/5.10.1-11.2.0
  
  srun pvserver

**Parallel running greatly speeds up program response, up to 12 cores can be used with the //NoCompute// queue.**
==== Client-side configuration ====
  * Connect Paraview on your local machine using File > Connect... or the {{:computing:cluster:fronty:paraview_connect_icon.png?nolink|}} icon.

  * If the connection was not previously created, press //Add Server// in following screenshot:


{{ :computing:cluster:fronty:paraview_addserver.png?nolink | }}


  * and fill in information from screenshot:
{{ :computing:cluster:fronty:paraview_configure.png?nolink | }}
  * (//pvserver// prints the necessary connection data to the terminal at startup)

  * All that's left is to confirm with //Configure// still within the same screenshot and then press //Save// on the next window:
{{ :computing:cluster:fronty:paraview_configuresave.png?nolink |}}
  * Now the connection should be possible using //Connect//
{{ :computing:cluster:fronty:paraview_addserver.png?nolink |}} 

==== Error Messages ====
If the version of the program on the Server side does not match the version on the Client side, even with a properly configured connection, you will get a following error:
{{ :computing:cluster:fronty:paraview_err_serverclientversion.png?direct |}}