Darmstadt 2008 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 5: Instrumentation und Anwendungen II

HK 5.6: Talk

Monday, March 10, 2008, 15:30–15:45, 2D

High performance data acquisition with InfiniBand. — Jörn Adamczewski, •Hans G. Essel, Nikolaus Kurz, and Sergey Linev — GSI, Darmstadt, Germany

For the new experiments at FAIR new concepts of data acquisition systems have to be developed like the distribution of self-triggered, time stamped data streams over high performance networks for event building. In this concept any data filtering is done behind the network. Therefore the network must achieve up to 1 GByte/s bi-directional data transfer per node. Detailed simulations have been done to optimize scheduling mechanisms for such event building networks. For real performance tests InfiniBand has been chosen as one of the fastest available network technology. The measurements of network event building have been performed on different Linux clusters from four to over hundred nodes. Several InfiniBand libraries have been tested like uDAPL, Verbs, or MPI. The tests have been integrated in the Data Acquisition Backbone Core software DABC, a general purpose data acquisition library. Detailed results will be presented. In the worst cases (over hundred nodes) 50% of the required bandwidth can be already achieved. It seems possible to improve these results by further investigations. The development of key components is supported by the FutureDAQ project of the European Union (FP6 I3HP JRA1).