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Roihu NVIDIA GH200 Hackathon

Format: On-site hackathon
Dates: 16–18 September 2026
Location: CSC Training facilities, Keilaranta 14, Espoo
Target system: Roihu, NVIDIA Grace Hopper GH200 GPUs

Event overview

Roihu is CSC’s new national supercomputer based on NVIDIA Grace Hopper GH200 nodes. The system combines NVIDIA Hopper GPUs with Grace Arm CPUs and provides a programming environment that differs in important ways from previous CSC GPU systems such as Mahti.

This event is intended for researchers and developers who want to understand how to use Roihu efficiently, especially for scientific and high-performance computing applications. Selected teams will work on their own codes with support from expert mentors from NVIDIA and CSC. The aim is to make concrete progress on porting, debugging, profiling, or optimizing applications for Roihu GH200.

The hackathon participants are recommended to attend also the training organized right before the hackathon.
Link to training page/part.

Who can apply?

The hackathon is intended for code developer teams targeting CSC’s Roihu system.

Eligible applicants include users who are eligible to access CSC computing resources, especially researchers and developers affiliated with Finnish higher education institutions, research institutes, or other organizations eligible for CSC services.

Participating teams should consist of up to four people.

What we are looking for

We are looking for teams with a clear and realistic technical goal for the hackathon.

Suitable projects may include:

  • Porting a CPU-only application to NVIDIA GPUs.
  • Improving support for NVIDIA GPUs in a portable GPU application.
  • Optimizing CUDA, OpenMP offload, OpenACC, or library-based GPU code.
  • Profiling and improving multi-GPU or multi-node GPU performance.
  • Investigating memory placement, unified memory behavior, or data movement bottlenecks.

Teams should know their application well and have a clear idea of what they want to achieve during the hackathon.

The scope should be limited so that meaningful progress can be made during the three-day hackathon.

Open source applications are strongly preferred.

Expectations for participating teams

Accepted teams are expected to:

  • Prepare their code before the event.
  • Identify one or more concrete technical goals.
  • Participate actively during the full hackathon.
  • Work closely with CSC and NVIDIA experts.
  • Give a short final presentation summarizing progress and next steps.

Possible project goals

Examples of suitable goals include:

  • Getting the application running efficiently on Roihu.
  • Identifying the main performance bottlenecks.
  • Improving GPU utilization.
  • Reducing unnecessary CPU-GPU data movement.
  • Improving scaling across multiple GPUs or nodes.
  • Comparing CUDA, OpenMP offload, OpenACC, or library-based implementations.
  • Creating a roadmap for further optimization after the hackathon.

Hackathon schedule

16 September 2026

09:00–12:00

Hackathon kickoff and team work.

  • Welcome and practical information.
  • Team introductions.
  • Review of project goals.
  • Start of hands-on work.

12:00–13:00

Lunch break.

13:00–17:00

Hackathon team work.

17 September 2026

09:00–12:00

Hackathon team work.

12:00–13:00

Lunch break.

13:00–17:00

Hackathon team work.

18:30-20:00

Dinner (TBD)

18 September 2026

09:00–12:00

Hackathon wrap-up.

  • Final hands-on work.
  • Team progress summaries and short final presentations.
  • Future plans

12:00–13:00

Lunch.

Registration

Registration details will be added later.

Hackathon application

Hackathon teams must apply in advance.

The application should include:

  • Team members and affiliations.
  • Short description of the application/code.
  • Target programming model or framework.
  • Main technical goals for the hackathon.
  • Repository link, if available.
  • Whether the code is open source.

Applications will be evaluated based on technical fit, feasibility, expected impact, and readiness of the team. 

Important dates

  • Hackathon application deadline: 14 August 2026
  • Notification of accepted teams: by 19 August 2026
  • Deadline for confirming hackathon participation: 26 August 2026

Attendance fee

For Acedemic and Research organisation participants: 225,90€ (VAT 25,5% Included)

For Industry: 1054,20€ (VAT 25,5% Included)

Comments and questions

For questions about the event, please contact:

training@csc.fi

Organizer

CSC – IT Center for Science