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Login Nodes

Opening an SSH connection to ULHPC systems results in a connection to an access node.

=== "Iris" bash ssh iris-cluster

=== "Aion" bash ssh aion-cluster === "Iris (X11)" To be able to further run GUI applications within your [interactive] jobs: bash ssh -X iris-cluster # OR on Mac OS: ssh -Y iris-cluster === "Aion (X11)" To be able to further run GUI applications within your [interactive] jobs: bash ssh -X aion-cluster # OR on Mac OS: ssh -Y aion-cluster

!!! important Recall that you SHOULD NOT run any HPC application on the login nodes.

That's why the `module` command is **NOT** available on them.

Usage

On access nodes, typical user tasks include

  • Transferring and managing files
  • Editing files
  • Submitting jobs

!!! warning "Appropriate Use" Do not run compute- or memory-intensive applications on access nodes. These nodes are a shared resource. ULHPC admins may terminate processes which are having negative impacts on other users or the systems.

!!! warning "Avoid watch" If you must use the watch command, please use a much longer interval such as 5 minutes (=300 sec), e.g., watch -n 300 <your_command>.

!!! warning "Avoid Visual Studio Code" Avoid using Visual Studio Code to connect to the HPC, as it consumes a lot of resources in the login nodes. Heavy development shouldn't be done directly on the HPC. For most tasks using a terminal based editor should be enough like: Vim or Emacs. If you want to have some more advanced features try Neovim where you can add plugins to meet your specific needs.

Tips

!!! tip "ULHPC provides a wide variety of qos's" * An interactive qos is available on Iris and Aion for compute- and memory-intensive interactive work. Please, use an interactive job for resource-intensive processes instead of running them on access nodes.

!!! tip To help identify processes that make heavy use of resources, you can use:

* `top -u $USER`
* `/usr/bin/time -v ./my_command`

!!! tip "Running GUI Application over X11" If you intend to run GUI applications (MATLAB, Stata, ParaView etc.), you MUST connect by SSH to the login nodes with the -X (or -Y on Mac OS) option:

=== "Iris"
    ```bash
    ssh -X iris-cluster   # OR on Mac OS: ssh -Y iris-cluster
    ```
=== "Aion"
    ```bash
    ssh -X aion-cluster   # OR on Mac OS: ssh -Y aion-cluster
    ```

!!! tip "Install Neovim using Micormamba" Neovim is not installed by default on the HPC but you can install it using Micromamba.

```bash
micromamba create --name editor-env
micromamba install --name editor-env conda-forge::nvim
```
After installation you can create a alias in your `.bashrc` for easy access:
```bash 
alias nvim='micromamba run --name editor-env nvim'
```