.. _Ehlers cluster:
Ehlers cluster
==============
.. _Ehlers overview:
Overview
--------
`Ehlers `__
is a university cluster with NVIDIA GPUs,
available to SimTech-affiliated personnel.
In total, the cluster consists of 1920 compute cores split across 17 nodes
using a :qty:`200 ` InfiniBand.
See the `Ehlers internal pages `__
for more information.
+-----------+--------+-------+------------------+----------+-----------+
| Type | Nodes | Cores | RAM | GPU | Partition |
+===========+========+=======+==================+==========+===========+
| CPU | 12 | 2x64 | :qty:`2 ` | | ``cpu`` |
+-----------+--------+-------+------------------+----------+-----------+
| GPU | 4 | 2x32 | :qty:`512 ` | 4x A100 | ``gpu`` |
+-----------+--------+-------+------------------+----------+-----------+
| DGX | 1 | 2x64 | :qty:`2 ` | 8x A100 | ``dgx`` |
+-----------+--------+-------+------------------+----------+-----------+
.. _Ehlers partitions:
Partitions and nodes
--------------------
CPU nodes
^^^^^^^^^
There are 12 nodes equipped with 2 :cpu-amd-sheet1:`AMD EPYC 7702 <8766>`
(64 cores, 128 threads, :qty:`2.0 `, :qty:`200 `), :qty:`2 ` of RAM,
InfiniBand (:qty:`200 `) interconnect.
There are no GPUs.
GPU nodes
^^^^^^^^^
There are 4 nodes equipped with 2 :cpu-amd-sheet1:`AMD EPYC 7543 <10941>`
(32 cores, 64 threads, :qty:`2.8 `, :qty:`225 `), :qty:`512 ` of RAM,
InfiniBand (:qty:`200 `) interconnect.
Each node has 4 :gpu-nvidia-sheet1:`NVIDIA Tesla A100
`
(:qty:`80 ` HBM2).
DGX nodes
^^^^^^^^^
There is 1 node equipped with 2 :cpu-amd-sheet1:`AMD EPYC 7742 <8761>`
(64 cores, 128 threads, :qty:`2.25 `, :qty:`225 `), :qty:`2 ` of RAM.
Each node has 8 :gpu-nvidia-sheet1:`NVIDIA Tesla A100
`
(:qty:`80 ` HBM2).
.. _Ehlers access:
Access
------
See the `Ehlers user documentation `__
for detailed instructions. The application form is 1-page long and must be signed
by both the PI and the researcher who will use the cluster.
See also :doc:`/_pages/_appendix/using_ehlers` for building software and submitting jobs.
.. _Ehlers obligations:
Obligations
-----------
Use of the cluster must be acknowledged in scientific publications.
The acknowledgment must follow a strict formulation that depends on
co-authors' affiliations and the type of funding. For the exact details,
refer to `SimTech Startseite / Publications / Acknowledgement
`__.