Using the CMS High Level Trigger as a Cloud Resource

Colling, David
Huffman, Adam
McCrae, Alison
Lahiff, Andrew
Grandi, Claudio
Cinquilli, Mattia
Gowdy, Stephen
Coarasa, Jose Antonio
Tiradani, Anthony
Ozga, Wojciech
Chaze, Olivier
Sgaravatto, Massimo
Bauer, Daniela

Open link

Publication date

January 2014

DOI

10.1088/1742-6596/513/3/032019

Publisher

IOP Publishing

Abstract

The CMS High Level Trigger is a compute farm of more than 10,000 cores. During data taking this resource is heavily used and is an integral part of the experiment's triggering system. However, outside of data taking periods this resource is largely unused. We describe why CMS wants to use the HLT as a cloud resource (outside of data taking periods) and how this has been achieved. In doing this we have turned a single-use cluster into an agile resource for CMS production computing. While we are able to use the HLT as a production cloud resource, there is still considerable further work that CMS needs to carry out before this resource can be used with the desired agility. This report, therefore, represents a snapshot of this activity at the t...