SLING National Open Access
Access and use of supercomputer capacities in open access are governed by the Rules for access and use of supercomputer capacities in open access, adopted by the SLING Council. They refer to clusters of those organizations or system administrators included in the SLING consortium who want to offer part of their capacities for general, open use in a uniform and organized manner to all eligible users in Slovenia.
Within the framework of SLING, on the basis of these rules, it is possible to obtain part of the supercomputing capacities of the following clusters:
Beneficiaries
Beneficiaries for capacity allocation can be individual applicants or groups. When the capacity is assigned to a group, the applicant must specify in the application the person who conducts the research and is responsible for the list of participants in the research who use the allocated capacities. The type and size of the allocated capacity depends on the role and importance of the project, so that all users or groups who are entitled to apply can submit an access proposal for any of the envisaged types of access.

Types of projects and calls
When registering for access, the applicant must choose one of the planned types of access listed below that best suits the purpose of the application. Access types differ in purpose, amount of allocated resources, and time limit for resource allocation.
Test Access (TA)
Test access is intended for new users of the SLING infrastructure to learn how to use the available systems and to test the software and algorithms before preparing a larger access proposal. It is also suitable for existing users who need an allocation to test new software or applications and want to prepare appropriate benchmarking, performance and scalability analyses.
Permanent Calls
Call for the allocation of SLING resources for Test Access (permanent).
The results will be announced within 1 month after each submission deadline.
System | Resources per access (node hours) | Resources per access (core hours) |
---|---|---|
Vega – CPU | 5.000 | 640.000 |
Vega – GPU | 400 | / |
Arnes – CPU | 5.000 | 320.000 |
Arnes – GPU | 400 | / |
Leonardo– DCGP (CPU) | 400 | |
Leonardo– Booster (GPU) | 800 |

Development Access (DA)
Development access is mainly aimed at the development of software and algorithms.
Permanent Calls
Call for SLING Resources for Development Research Acces (permanently open).
The results will be announced within 1 month after each submission deadline.
System | Resources per access (node hours) | Resources per access (core hours) |
---|---|---|
Vega – CPU | 10.000 | 1.280.000 |
Vega – GPU | 1.000 | / |
Arnes – CPU | 5.000 | 320.000 |
Arnes – GPU | 1.000 | / |
Leonardo– DCGP (CPU) | 1.000 | |
Leonardo– Booster (GPU) | 2.000 |

Regular Research Access (RRAs)
Regular research access is intended for production use of supercomputing capacities or data storage allocations when the requirements are not very large.
Open calls
Deadlines for applications: 1 October 2024, 1 February 2025, 1 June 2025, 1 October 2025
The results will be announced within 1 month after each submission deadline.
System | Resources per access (node hours) Maximum | Resources per access (node hours) Maximum |
---|---|---|
HPC Vega – CPU | 200.000* | 25.600.000 |
HPC Vega – GPU | 25.000** | / |
Arnes – CPU | 50.000 | 3.200.000 |
Arnes – GPU | 10.000 | / |
Leonardo – DCGP (CPU) | 12.000 | |
Leonardo – Booster (GPU) | 28.000 (14.000 min/access) |
*The commercial value of resources in this range is approximately €200,000. EuroHPC Vega price list.
**The commercial value of resources in this range is approximately €125,000. EuroHPC Vega price list.
System | Total resources for all types (node hours) | Total resources for all types (core hours) |
---|---|---|
HPC Vega – CPU | 800.000 | 102.400.000 |
HPC Vega – GPU | 50.000 | / |
Arnes – CPU | 200.000 | 12.800.000 |
Arnes – GPU | 40.000 | / |
Leonardo – DCGP (CPU) | 12.000 | |
Leonardo – Booster (GPU) | 28.000 (14.000 min/access) |

Large Research Access (LRA)
Intended for production use, as well as for the development of software systems and algorithms, adaptation of existing software, or methodology testing of specific scientific prototypes, when large amounts of computing resources or data stores must be used for the process or due to the amount of data.
Open calls
Deadlines for applications: 1 November 2024, 1 February 2025, 1 June 2025, 1 October 2025
The results will be announced within 2 months after each submission deadline.
Systems | Resources per access (node hours) Minimum | Resources per access (node hours) Minimum |
---|---|---|
HPC Vega – CPU | 200.000* | 25.600.000* |
HPC Vega – GPU | 25.000** | / |
Leonardo– DCGP (CPU) | max 30.000*** | |
Leonardo– Booster (GPU) | max. 75.000*** |
*The commercial value of resources in this range is approximately €200,000. EuroHPC Vega price list.
**The commercial value of resources in this range is approximately €125,000. EuroHPC Vega price list.
*** Resources will be available to the extent that they are not used under the other calls mentioned above.
Systems | Total resources for all types (node hours) | Total resources for all types (core hours) |
---|---|---|
HPC Vega – CPU | 1.000.000 | 128.000.000 |
HPC Vega – GPU | 80.000 | / |