doi:10.1007/978-3-642-36949-0_61engBaity-Jesi, M.Baños, R.A.Cruz, A.Fernandez, L.A.Gil-Narvion, J.Gordillo-Guerrero, A.Guidetti, M.Iñiguez, D.Maiorano, A.Mantovani, F.Marinari, E.Martin-Mayor, V.Monforte-Garcia, J.Muñoz-Sudupe, A.Navarro, D.Parisi, G.Perez-Gaviro, S.Pivanti, M.Ricci-Tersenghi, F.Ruiz-Lorenzo, J.Schifano, S.F.Seoane, B.Tarancon, A.Tellez, P.Tripiccione, R.Yllanes, D.Spin glass simulations on the Janus architecture: A desperate quest for strong scalingART-2013-80444We describe Janus, an application-driven architecture for Monte Carlo simulations of spin glasses. Janus is a massively parallel architecture, based on reconfigurable FPGA nodes; it offers two orders of magnitude better performance than commodity systems for spin glass applications. The first generation Janus machine has been operational since early 2008; we are currently developing a new generation, that will be on line in early 2013. In this paper we present the Janus architecture, describe both implementations and compare their performances with those of commodity systems.2013http://zaguan.unizar.es/record/15202710.1007/978-3-642-36949-0_61http://zaguan.unizar.es/record/152027oai:zaguan.unizar.es:152027info:eu-repo/grantAgreement/EC/FP7/247328/EU/Critical Phenomena in Random Systems/CRIPHERASYinfo:eu-repo/grantAgreement/ES/MEC/FIS2006-08533info:eu-repo/grantAgreement/ES/MEC/FPA2004-02602info:eu-repo/grantAgreement/ES/MICINN/FIS2007-60977info:eu-repo/grantAgreement/ES/MICINN/FIS2009-12648-C03-02info:eu-repo/grantAgreement/ES/MICINN/FIS2010-16587info:eu-repo/grantAgreement/ES/MICINN/TEC2007-64188info:eu-repo/grantAgreement/ES/MICINN/TEC2010-19207Lecture Notes in Computer Science 7640 (2013), 528-537All rights reservedhttp://www.europeana.eu/rights/rr-f/info:eu-repo/semantics/openAccess