000152187 001__ 152187
000152187 005__ 20251017144555.0
000152187 0247_ $$2doi$$a10.1140/epjst/e2012-01636-9
000152187 0248_ $$2sideral$$a78887
000152187 037__ $$aART-2012-78887
000152187 041__ $$aeng
000152187 100__ $$aBaity-Jesi, M.
000152187 245__ $$aReconfigurable computing for Monte Carlo simulations: Results and prospects of the Janus project
000152187 260__ $$c2012
000152187 5060_ $$aAccess copy available to the general public$$fUnrestricted
000152187 5203_ $$aWe describe Janus, a massively parallel FPGA-based computer optimized for the simulation of spin glasses, theoretical models for the behavior of glassy materials. FPGAs (as compared to GPUs or many-core processors) provide a complementary approach to massively parallel computing. In particular, our model problem is formulated in terms of binary variables, and floating-point operations can be (almost) completely avoided. The FPGA architecture allows us to run many independent threads with almost no latencies in memory access, thus updating up to 1024 spins per cycle. We describe Janus in detail and we summarize the physics results obtained in four years of operation of this machine; we discuss two types of physics applications: long simulations on very large systems (which try to mimic and provide understanding about the experimental non-equilibrium dynamics), and low-temperature equilibrium simulations using an artificial parallel tempering dynamics. The time scale of our non-equilibrium simulations spans eleven orders of magnitude (from picoseconds to a tenth of a second). On the other hand, our equilibrium simulations are unprecedented both because of the low temperatures reached and for the large systems that we have brought to equilibrium. A finite-time scaling ansatz emerges from the detailed comparison of the two sets of simulations. Janus has made it possible to perform spin-glass simulations that would take several decades on more conventional architectures. The paper ends with an assessment of the potential of possible future versions of the Janus architecture, based on state-of-the-art technology.
000152187 536__ $$9info:eu-repo/grantAgreement/EC/FP7/247328/EU/Critical Phenomena in Random Systems/CRIPHERASY$$9info:eu-repo/grantAgreement/ES/MEC/FIS2006-08533$$9info:eu-repo/grantAgreement/ES/MEC/FPA2004-02602$$9info:eu-repo/grantAgreement/ES/MICINN/FIS2007-60977$$9info:eu-repo/grantAgreement/ES/MICINN/FIS2009-12648$$9info:eu-repo/grantAgreement/ES/MICINN/FIS2010-16587$$9info:eu-repo/grantAgreement/ES/MICINN/TEC2010-19207
000152187 540__ $$9info:eu-repo/semantics/openAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/
000152187 590__ $$a1.796$$b2012
000152187 591__ $$aPHYSICS, MULTIDISCIPLINARY$$b23 / 83 = 0.277$$c2012$$dQ2$$eT1
000152187 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/submittedVersion
000152187 700__ $$0(orcid)0000-0002-5060-7658$$aBaños, R.A.$$uUniversidad de Zaragoza
000152187 700__ $$0(orcid)0000-0002-7934-7271$$aCruz, A.$$uUniversidad de Zaragoza
000152187 700__ $$aFernandez, L.A.
000152187 700__ $$0(orcid)0000-0003-2903-3044$$aGil-Narvion, J.
000152187 700__ $$aGordillo-Guerrero, A.
000152187 700__ $$aGuidetti, M.
000152187 700__ $$0(orcid)0000-0003-2916-5493$$aIñiguez, D.
000152187 700__ $$aMaiorano, A.
000152187 700__ $$aMantovani, F.
000152187 700__ $$aMarinari, E.
000152187 700__ $$aMartin-Mayor, V.
000152187 700__ $$aMonforte-Garcia, J.$$uUniversidad de Zaragoza
000152187 700__ $$aSudupe, A.M.
000152187 700__ $$0(orcid)0000-0002-0795-8743$$aNavarro, D.$$uUniversidad de Zaragoza
000152187 700__ $$aParisi, G.
000152187 700__ $$aPivanti, M.
000152187 700__ $$aPerez-Gaviro, S.
000152187 700__ $$aRicci-Tersenghi, F.
000152187 700__ $$aRuiz-Lorenzo, J.
000152187 700__ $$aSchifano, S.F.
000152187 700__ $$0(orcid)0000-0002-5967-2827$$aSeoane, B.$$uUniversidad de Zaragoza
000152187 700__ $$0(orcid)0000-0003-2772-3762$$aTarancon, A.$$uUniversidad de Zaragoza
000152187 700__ $$aTellez, P.
000152187 700__ $$aTripiccione, R.
000152187 700__ $$0(orcid)0000-0001-7276-2942$$aYllanes, D.
000152187 7102_ $$15008$$2785$$aUniversidad de Zaragoza$$bDpto. Ingeniería Electrón.Com.$$cÁrea Tecnología Electrónica
000152187 7102_ $$15005$$2555$$aUniversidad de Zaragoza$$bDpto. Ing.Quím.Tecnol.Med.Amb.$$cÁrea Ingeniería Química
000152187 7102_ $$12004$$2405$$aUniversidad de Zaragoza$$bDpto. Física Teórica$$cÁrea Física Teórica
000152187 773__ $$g210, 1 (2012), 33-51$$pEur. phys. j., spec. top.$$tEuropean Physical Journal-Special Topics$$x1951-6355
000152187 8564_ $$s408644$$uhttps://zaguan.unizar.es/record/152187/files/texto_completo.pdf$$yPreprint
000152187 8564_ $$s1795744$$uhttps://zaguan.unizar.es/record/152187/files/texto_completo.jpg?subformat=icon$$xicon$$yPreprint
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000152187 951__ $$a2025-10-17-14:12:53
000152187 980__ $$aARTICLE