.. _HLRS:

HLRS
====

.. _HLRS overview:

Overview
--------

The `High-Performance Computing Center Stuttgart (HLRS) <https://www.hlrs.de/>`__
is a central facility of the University of Stuttgart that operates the Tier-0,
26 PFLOPS peak performance, :doc:`HPE Apollo Hawk <hawk>` supercomputer.
It also operates the :doc:`Vulcan <vulcan>` cluster for artificial
intelligence, big data analytics and visualization, and is currently
developing exascale capabilities [#hlrs_exascale]_.
See their `Solutions <https://www.hlrs.de/solutions>`__ page for more details.

.. _HLRS Applying for compute time:

Applying for compute time
-------------------------

Quoting from rubric "University of Stuttgart researchers" in
`Apply for Computing Time <https://www.hlrs.de/apply-for-computing-time>`__:

    Each University of Stuttgart institute/department has identified a single contact
    person who is responsible for managing administrative issues related to usage of
    HLRS's systems. The contact person in your department is responsible for defining
    new projects (accounting groups or "Abrechnungsprojekte") and user logins through
    the `administration interface <https://java.hlrs.de/hpc-projects/instadmin/>`__
    (password restricted).

    If your institute/department does not yet have such a person, please use this
    `contact form <https://www.hlrs.de/fileadmin/for_users/AnschreibenWebInterface_Uni_v193.pdf>`__
    to define who is responsible.

Frank Huber is the contact person at the ICP.

.. _HLRS obligations:

Obligations
-----------

Usage of HLRS comes with reporting obligations and acknowledgment requirements.
The exact formulation for the acknowledgment is documented in the HLRS wiki.
Every year, a progress report must be submitted in the form of a conference paper
(`submission page <https://www.hlrs.de/for-users/annual-user-report-submission>`__).
The most impactful contributions will be published in the HLRS book series
"High Performance Computing in Science & Engineering". Already published papers
are eligible, pending permission from the copyright holder (see e.g. book
chapter :cite:t:`hirschmann20a` and its reprint in :cite:t:`hirschmann22a`).

.. _HLRS publications:

Publications
------------

Hazel Hen

* :cite:`zeman20b,zeman21a`: GROMACS simulations (project of the ICP)
* :cite:`hirschmann18a,hirschmann19a,hirschmann19b`:
  ESPResSo simulations with 3.2 million particles using load balancing
  [#grant_Librepa]_ (project of the SFB 716 [#grant_SFB_716]_)
* :cite:`hirschmann20a,hirschmann22a,hirschmann21a`:
  ESPResSo simulations with 110 million particles on Hazel Hen and SuperMUC

HLRS curated databases

* `all publications enabled by the HLRS <https://www.hlrs.de/user-research/publications>`__
* `all books and proceedings published by the HLRS <https://www.hlrs.de/user-research/books>`__

Miscellaneous

* :cite:`gugerli22a`: HLRS history

____

.. [#grant_Librepa] DFG grant number :dfg-gepris:`265686075`.

.. [#grant_SFB_716] DFG grant number :dfg-gepris:`17546514`.

.. [#hlrs_exascale] Press release `University of Stuttgart and
   Hewlett Packard Enterprise to Build Exascale Supercomputer
   <https://www.hlrs.de/press/detail/university-of-stuttgart-and-hewlett-packard-enterprise-to-build-exascale-supercomputer>`__,
   December 2023.