= The MSA story of the DEEP projects family =
[[Image(Deep-Projects-lang_blau.jpg, center)]]

== 1) Motivation ==
'''[[span(style=color: #008000, General purpose systems )]]'''
 '''[[span(style=color: #00FF00, + )]]''' Highly flexible\\
 '''[[span(style=color: #FF0000, -  )]]''' High energy consumption\\
 '''[[span(style=color: #00FF00, + )]]''' Preferred by many applications
'''[[span(style=color: #0000FF, Highly scalable systems )]]'''
 '''[[span(style=color: #FF0000, -  )]]''' Few (highly parallelizable) codes can fully exploit them\\
 '''[[span(style=color: #00FF00, + )]]''' Highly energy efficient

== 2) Can one combine the best of these two worlds into a single system? -> Yes! Exploit heterogeneity! ==
=== Homogeneous cluster ===
* General purpose CPUs attached to a high-speed network
[[Image(HomCluster.PNG)]]
 '''[[span(style=color: #00FF00, + )]]''' Easy to use, very flexible\\
 '''[[span(style=color: #FF0000, -  )]]''' Power hungry\\
=== Traditional heterogeneous cluster ===
* Attach accelerators (e.g. GPUs) to each CPU
[[Image(HetCluster.PNG)]]
 '''[[span(style=color: #00FF00, + )]]''' Energy efficient, easy management\\
 '''[[span(style=color: #FF0000, -  )]]''' Static assignment of accelerators to CPUs\\
== 3) The basis for the MSA: The Cluster-Booster Concept ==
The MSA developed in DEEP-EST builds on the so-called Cluster-Booster architecture. It was first conceptualized and proven with prototypes in the DEEP project. It is a combination of a standard HPC Cluster and a tightly connected HPC Booster.
=== Cluster-Booster architecture ===
[[Image(CB.PNG)]]
 '''[[span(style=color: #00FF00, + )]]''' Energy efficient, high flexibility, dynamic ressource assignment