# Tutorials

Guides to scientific computing: high-performance computing (HPC) clusters, Jupyter, conda, git, and GPUs. I started these as a postdoc, so most examples use WHOI's Poseidon and Hydra clusters, but they apply to any SLURM cluster.

## Posts

**[Use the GPUs on Hydra](tutorials/use-the-gpus-on-hydra.md)** · *August 12, 2026*
: What a GPU is, when (and when not) to use one, and how to run a trained scikit-learn random forest on Hydra's GPU node with nvForest, scaling up to all four GPUs.

**[Getting started with Hydra 🐉](tutorials/getting-started-with-hydra.md)** · *June 10, 2026*
: Get an account, log in, set up passwordless SSH, build conda environments, and run Jupyter Notebooks on WHOI's new cluster.

**[IS announcement: Hydra, WHOI's new HPC cluster](tutorials/about-hydra.md)** · *June 4, 2026*
: A copy of WHOI Information Services' announcement of Hydra, with its hardware specs and migration details, for quick reference.

**[Basic version control and collaboration with git](tutorials/basic-git.md)** · *March 28, 2024*
: Clone a repository, work on branches, commit and push changes, and merge updates from collaborators.

**[Using Python on Poseidon](tutorials/poseidon-basics.md)** · *October 3, 2023*
: Log in, use SLURM to submit and monitor jobs, set up conda and pip environments, and sync files to the cluster.

**[Running Jupyter Notebooks remotely on Poseidon](tutorials/poseidon-jupyter.md)** · *October 2, 2023*
: Start a notebook on a compute node and open it in your local browser through an SSH tunnel, plus troubleshooting for busy ports.