2nd LUMI Roadshow Q/A

The online 2nd LUMI Roadshow attracted 55 participants and was built upon the 1st LUMI Roadshow where the first official introduction of LUMI to the Swedish audience took place. Participants ranged once more from different disciplines in academia, as well as public administration and private enterprises. 

This time the LUMI Roadshow took place within two half-days. On the first day the participants got informed for the latest stages of LUMI preparations and updates, as well as information on the details of the EuroHPC Joint Undertaking (EuroHPC JU) access procedures and policies for the EuroHPC JU systems. The second day included a tutorial on how scientists and organizations can apply for Partnership for Advanced Computing in Europe (PRACE) and EuroHPC JU allocation. 

LUMI User Support team (LUST) and their activities to support the Swedish users was also presented to participants. Swedish National INfrastructure for Computing (SNIC) discussed the possibilities of access to the national part of the LUMI system.


Pekka Manninen, the director of LUMI, pointed that CSC is looking into providing a CI infrastructure (perhaps via GitLab) directly on the LUMI-G/C (but not MI200’s on LUMI-K). Regarding machine learning software, it is expected that Tensorflow and Pytorch will be the main option, as both support AMD GPUs. There are preliminary tests already on MI100 and the performance looks good. It is worth mentioning that the performance results and training time of AMD GPUs using ML libraries such as Tensorflow, are to a large extent comparable with NVIDIA GPUs.

Pekka also mentioned that Singularity will be supported, so it will be possible to run user-defined Docker images in LUMI-G, if the Docker image can be run on top of that. Additionally, SLRUM will be the scheduler to be used on LUMI.

It is also possible that there will be introductory workshops on modern frameworks like Kokkos and Alpaka. ENCCS in collaboration with CSC and other partners will be organizing such training on these subjects as well in the future. 

LUMI-Q will add a new, separate expert team, to help the community to explore quantum algorithms. The focus of the quantum computing field today is more towards exploring algorithms and simulating them on classical computers, rather than actually running useful calculations on (small) quantum computers.

LUMI and Sweden

Researchers in Sweden will be able to interact with LUMI through the following channels

  • ENCCS – Help with the call application forms
  • ENCCS – Help with medium to extensive porting to (pre)exa-scale systems especially porting to GPUs
  • LUST/SNIC AE – Help to adjust compilation parameters, fixing smaller portability issues, optimization, etc

Q: How to apply for Dardel? Can we move our runtime from Tegner or Beskow to use Dardel instead?

Dardel allocations go through SNIC as usual. You can also apply for a smaller local project at PDC just for tests run. One will be able to apply for access to Dardel via supr.snic.se.

Q: Does one need an approved project allocation on LUMI to be able to use the support?

SNIC and ENCCS will not turn down anyone asking for support. But the general rule of thumb is that if one has an allocation on LUMI, they contact the LUMI help desk. Before applying, for example, if one needs help with preparing the application to EuroHPC for resources, one can contact ENCCS. For application porting projects, to help engineers move their code to LUMI, there is either the ENCSS at info@enccs.se or the SNIC “dedicated” project support (https://www.snic.se/support/dedicated-user-support/).

Q: How and where does one apply for a software development (S) project on LUMI? (SNIC does not seem to provide this type of call)

The calls will be published on the PRACEand EuroHPC JU common portal at https://pracecalls.eu. You can already create an account there and then you will see all the flavors of calls available at a given point in time. The Development type of call on Vega is planned to be open during April and ENCCS will be announcing these through its newsletter: https://enccs.se/newsletter.

Q: When are the PRACE calls for LUMI-C and LUMI-G opening?

The call for Pilots on LUMI-C just closed and the access starts in September. The SNIC-extreme is currently open for LUMI-C so you are welcome to apply already. The calls for LUMI-G are expected to be open in Autumn 2021.

Q: Whom can Swedish researchers contact for support with PRACE application writing at ENCCS?

You are very welcome to contact anyone at ENCCS and we are here exactly for this purpose – to help you to apply so just email info@enccs.se, or contact Lilit Axner

Q: Is the information about various application types available online?

ENCCS is developing a page on https://enccs.se/proposal-support/ where all current calls will be available and explained, but both PRACE and EuroHPC JU are doing the same on their pages. The calls are new so dissemination material is in the process of development.

Q: In the current call for LUMI allocations it is written: “Please notice that storage has to be applied for within the call if needed. Storage is applied for using TB hours.” Is it correct to calculate the required TB hours as (Average required storage in TB)*(time of allocation in hours)*(cost of individual storage form)?  How are quotas specified for individual projects if large amounts of storage are required only in short bursts?

The TB hour is just a single currency for all storage. Indeed the different tiers will consume the quota at different speeds, so the formula above is a correct way to calculate it. These are not set to stone yet, but one can think of the factors being around 10x, 1x and 0.5x for LUMI-F, P, and O respectively.

If you missed the 2nd LUMI Roadshow, you can get the summary and slides at https://enccs.se/events/2021/03/2nd-lumi-roadshow/. SAVE the date for the 3rd LUMI Roadshow on the 8th of September 2021.

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Learn more about LUMI on https://www.lumi-supercomputer.eu.


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