---
title: Slurm cluster 'merlin7'
#tags:
keywords: configuration, partitions, node definition
#last_updated: 24 Mai 2023
summary: "This document describes a summary of the Merlin7 configuration."
sidebar: merlin7_sidebar
permalink: /merlin7/slurm-configuration.html
---
{:style="display:block; margin-left:auto; margin-right:auto"}
{{site.data.alerts.warning}}The Merlin7 documentation is Work In Progress.
Please do not use or rely on this documentation until this becomes official.
This applies to any page under https://lsm-hpce.gitpages.psi.ch/merlin7/
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This documentation shows basic Slurm configuration and options needed to run jobs in the Merlin7 cluster.
## Infrastructure
### Hardware
The current configuration for the _preproduction_ phase (and likely the production phase) is made up as:
* 92 nodes in total for Merlin7:
* 2 CPU-only login nodes
* 77 CPU-only compute nodes
* 5 GPU A100 nodes
* 8 GPU Grace Hopper nodes
The specification of the node types is:
| Node | CPU | RAM | GRES | Notes |
| ---- | --- | --- | ---- | ----- |
| Multi-core node | _2x_ AMD EPYC 7742 (x86_64 Rome, 64 Cores, 2.25GHz) | 512GB DDR4 3200Mhz | | For both the login and CPU-only compute nodes |
| A100 node | _2x_ AMD EPYC 7713 (x86_64 Milan, 64 Cores, 3.2GHz) | 512GB DDR4 3200Mhz | _4x_ NVidia A100 (Ampere, 80GB) | |
| GH Node | _2x_ NVidia Grace Neoverse-V2 (SBSA ARM 64bit, 144 Cores, 3.1GHz) | _2x_ 480GB DDR5X (CPU + GPU) | _4x_ NVidia GH200 (Hopper, 120GB) | |
### Network
The Merlin7 cluster builds on top of HPE/Cray technologies, including a high-performance network fabric called Slingshot. This network fabric is able
to provide up to 200 Gbit/s throughput between nodes. Further information on Slignshot can be found on .
Through software interfaces like [libFabric](https://ofiwg.github.io/libfabric/) (which available on Merlin7), application can leverage the network seamlessly.