The CMS event builder demonstrator and results with Myrinet

The data acquisition system for the CMS experiment at the Large Hadron Collider (LHC) will require a large and high performance event building network. Several switch technologies are currently being evaluated in order to compare different architectures for the event builder. One candidate is Myrine...

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Veröffentlicht in:Computer physics communications Jg. 140; H. 1; S. 130 - 138
Hauptverfasser: Antchev, G., Cano, E., Cittolin, S., Erhan, S., Faure, B., Gigi, D., Gutleber, J., Jacobs, C., Meijers, F., Meschi, E., Ninane, A., Orsini, L., Pollet, L., Racz, A., Samyn, D., Sinanis, N., Schleifer, W., Sphicas, P.
Format: Journal Article Tagungsbericht
Sprache:Englisch
Veröffentlicht: Amsterdam Elsevier B.V 15.10.2001
Elsevier Science
Schlagworte:
CMS
Computer systems: hardware, operating systems, computer languages and utilities
Computers in experimental physics
DAQ
Data acquisition: hardware and software
Data analysis: algorithms and implementation; data management
Event builder
Exact sciences and technology
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Myrinet
Network
Physics
CMS
Myrinet
Event builder
DAQ
Network
Packet switching
Data acquisition systems
Network architecture
Theoretical study
Data transmission network
Traffic information systems
Builders
Network interfaces
ISSN:0010-4655, 1879-2944
Online-Zugang:Volltext
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Beschreibung
Zusammenfassung:The data acquisition system for the CMS experiment at the Large Hadron Collider (LHC) will require a large and high performance event building network. Several switch technologies are currently being evaluated in order to compare different architectures for the event builder. One candidate is Myrinet. This paper describes the demonstrator which has been setup to study a small-scale (16×16) event builder based on PCs running Linux connected to Myrinet and Ethernet switches. A detailed study of the Myrinet switch performance has been performed for various traffic conditions, including the behaviour of composite switches. Results from event building studies are presented, including measurements on throughput, overhead and scaling. Traffic shaping techniques have been implemented and the effect on the event building performance has been investigated. The paper reports on performances and maximum event rate obtainable using custom software, not described, for the Myrinet control program and the low-level communication layer, implemented in a driver for Linux. A high performance sender is emulated by creating a dummy buffer that remains resident in the network interface and moving from the host only the first 64 bytes used by the event building protocol. An approximate scaling in N is presented assuming a balanced system where each source sends on average data to all destinations with the same rate.
ISSN:0010-4655
1879-2944
DOI:10.1016/S0010-4655(01)00264-8