VisIt¶

Introduction¶

VisIt is an Open Source, interactive, scalable, visualization, animation and analysis tool. From Unix, Windows or Mac workstations, users can interactively visualize and analyze data ranging in scale from small (<10 core) desktop-sized projects to large (>10,000 core) leadership-class computing facility simulation campaigns. VisIt supports a rich set of visualization features to enable users to view a wide variety of data including scalar and vector fields defined on two- and three-dimensional (2D and 3D) structured, adaptive and unstructured meshes. VisIt is capable of visualizing data from over 120 different scientific data formats¹. For a list, please see:

VisIt Supported Scientific Data Formats

Remote Visualization with VisIt¶

VisIt is configured to run as a client-server application. VisIt will run on your local desktop while the remote server will run on NERSC's machines. The VisIt client will connect to the server to browse files, launch jobs and run commands.

The following steps describe how to install VisIt on your desktop and configure it so that you can launch parallel jobs on NERSC's systems from within the VisIt GUI. Running VisIt in a client-server configuration requires establishing an ssh tunnel to the login node, launching the VisIt server, and connecting the client over the tunnel via a socket. These actions are completed behind the scenes and for the user the experience is the same as using VisIt on their local machine.

Install the VisIt Client¶

Download VisIt¶

The first step is to install VisIt. On your local workstation, we recommend you use the binaries that match the installed version at NERSC. This ensures client-server compatibility.

Several methods of installation are available. Please choose whichever is appropriate for your local machine. You can find additional download and install directions for VisIt at their website.

Install the NERSC Host Profile¶

After installing VisIt, you will need to install and load a new host profile for usage at NERSC. Please click the link below to download the file:

host_nersc_perlmutter.xml

VisIt will search for host configurations in $HOME/.visit/hosts on your local machine. Please save the downloaded host configuration to this location.

Start VisIt and Connect¶

When you start VisIt you should now be able to connect to Perlmutter. For example, you can list your files by selecting "Open File..." and then choosing, "perlmutter.nersc.gov" as the host. If you're able to browse your files on Perlmutter, then the VisIt client has successfully connected to the remote server.