학술논문
Effects of Adaptive Wormhole Routing in Event Builder Networks
Document Type
Conference
Author
Bauer, G.; Boyer, V.; Branson, J.; Brett, A.; Cano, E.; Carboni, A.; Ciganek, M.; Cittolin, S.; Erhan, S.; Gigi, D.; Glege, F.; Gomez-Reino, R.; Gulmini, M.; Mlot, E. Gutierrez; Gutleber, J.; Jacobs, C.; Kim, J.C.; Klute, M.; Lipeles, E.; Perez, J.A. Lopez; Maron, G.; Meijers, F.; Meschi, E.; Moser, R.; Murray, S.; Oh, A.; Orsini, L.; Paus, C.; Petrucci, A.; Pieri, M.; Pollet, L.; Racz, A.; Sakulin, H.; Sani, M.; Schieferdecker, P.; Schwick, C.; Sumorok, K.; Suzuki, I.; Tsirigkas, D.; Varela, J.
Source
2007 15th IEEE-NPSS Real-Time Conference Real-Time Conference, 2007 15th IEEE-NPSS. :1-7 Apr, 2007
Subject
Language
Abstract
The data acquisition system of the CMS experiment at the Large Hadron Collider features a two-stage event builder, which combines data from about 500 sources into full events at an aggregate throughput of 100 GByte/s. To meet the requirements, several architectures and interconnect technologies have been quantitatively evaluated. Both Gigabit Ethernet and Myrinet networks will be employed during the first run. Nearly full bi-section throughput can be obtained using a custom software driver for Myrinet based on barrel shifter traffic shaping. This paper discusses the use of Myrinet dual-port network interface cards supporting channel bonding to achieve virtual 5GBit/s links with adaptive routing to alleviate the throughput limitations associated with wormhole routing. Adaptive routing is not expected to be suitable for high-throughput event builder applications in high-energy physics. To corroborate this claim, results from the CMS event builder preseries installation at CERN are presented and the problems of wormhole routing networks are discussed.