-
F. Aglietti,
A. Bartoloni,
C. Battista,
S. Cabasino,
M. Cosimi,
A. Michelotti,
A. Monello,
E. Panizzi,
P. S. Paolucci,
W. Rinaldi,
D. Rossetti,
H. Simma,
M. Torelli,
P. Vicini, N. Cabibbo,
E. Centurioni,
W. Errico,
F. Laico,
G. Magazzù,
R. Tripiccione
[show abstract]
[hide abstract]
ABSTRACT: APEmille is a SIMD parallel processor under development at the Italian National Institute for Nuclear Physics (INFN). It is the third machine of the APE family, following Ape and Ape100. APEmille is well suited for Lattice QCD applications, climate modelling, neural networks, computational chemistry, numerical wind tunnels, seismic and combustion simulation. APEmille is a tridimensional array of custom processors each with peak performance of 528Mflop and 8-32 Mbytes of locally addressable RAM. The 2048-processor machine reaches the performance of 1.081Tflops. APEmille is interfaced to the external world through a PCI interface. A powerful programming language named TAO is provided. A C++ compiler is foreseen.
04/2006: pages 991-993;
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F. Belletti,
S.F. Schifano,
R. Tripiccione,
F. Bodin,
P. Boucaud,
J. Micheli,
O. Pene, N. Cabibbo,
S. de Luca,
A. Lonardo,
D. Rossetti,
P. Vicini,
M. Lukyanov,
L. Morin,
N. Paschedag,
H. Simma,
V. Morenas,
D. Pleiter,
F. Rapuano
[show abstract]
[hide abstract]
ABSTRACT: apeNEXT is the latest in the APE collaboration's series of parallel computers for computationally intensive calculations such as quantum chromo dynamics on the lattice. The authors describe the computer architectural choices that have been shaped by almost two decades of collaboration activity.
Computing in Science and Engineering 02/2006; · 1.42 Impact Factor
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Ape Collaboration,
F. Bodin,
Ph. Boucaud, N. Cabibbo,
F. di Carlo,
R. de Pietri,
F. di Renzo,
W. Errico,
H. Kaldass,
A. Lonardo, [......],
O. Pene,
D. Pleiter,
N. Paschedag,
F. Rapuano,
D. Rossetti,
L. Sartori,
F. Schifano,
H. Simma,
R. Tripiccione,
P. Vicini
[show abstract]
[hide abstract]
ABSTRACT: In this talk I report on the status of the apeNEXT project. apeNEXT is
the last of a family of parallel computers designed, in a research
environment, to provide multi-teraflops computing power to scientists
involved in heavy numerical simulations. The architecture and the custom
chip are optimized for Lattice QCD (LQCD) calculations but the
favourable price performance ratio and the good efficiency for other
kind of calculations make it a quite interesting tool for a large class
of scientific problems.
Nuclear Physics B - Proceedings Supplements 02/2005; 140:176-182. · 0.88 Impact Factor
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F. Bodin,
Ph. Boucaud, N. Cabibbo,
F. Di Carlo,
R. De Pietri,
F. Di Renzo,
H. Kaldass,
A Lonardo,
M. Lukyanov,
S. de Luca, [......],
O. Pene,
D. Pleiter,
N. Paschedag,
F. Rapuano,
D. Rossetti,
L Sartori,
F. Schifano,
H. Simma,
R. Tripiccione,
P. Vicini
[show abstract]
[hide abstract]
ABSTRACT: We present the APE (Array Processor Experiment) project for the development of dedicated parallel computers for numerical simulations in lattice gauge theories. While APEmille is a production machine in today's physics simulations at various sites in Europe, a new machine, apeNEXT, is currently being developed to provide multi-Tflops computing performance. Like previous APE machines, the new supercomputer is largely custom designed and specifically optimized for simulations of Lattice QCD. Comment: Poster at the XXIII Physics in Collisions Conference (PIC03), Zeuthen, Germany, June 2003, 3 pages, Latex. PSN FRAP15. Replaced for adding forgotten author
09/2003;
-
F. Bodin,
Ph. Boucaud,
J. Micheli,
O. Pene, N. Cabibbo,
F. Di Carlo,
A Lonardo,
S. de Luca,
F. Rapuano,
D. Rossetti, [......],
R. De Pietri,
F. Di Renzo,
H. Kaldass,
N. Paschedag,
H. Simma,
V. Morenas,
D. Pleiter,
L Sartori,
F. Schifano,
R. Tripiccione
[show abstract]
[hide abstract]
ABSTRACT: We present the current status of the apeNEXT project. Aim of this project is the development of the next generation of APE machines which will provide multi-teraflop computing power. Like previous machines, apeNEXT is based on a custom designed processor, which is specifically optimized for simulating QCD. We discuss the machine design, report on benchmarks, and give an overview on the status of the software development. Comment: Talk from the 2003 Computing in High Energy and Nuclear Physics (CHEP03), La Jolla, Ca, USA, March 2003, 8 pages, LaTeX, 12 eps figures. PSN THIT005
06/2003;
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R. Ammendola,
F. Bodin,
Ph. Boucaud, N. Cabibbo,
F. Di Carlo,
R. De Pietri,
F. Di Renzo,
W. Errico,
A Fucci,
M. Guagnelli, [......],
F. Rapuano,
P. De Riso,
D. Rossetti,
A. Salamon,
G Salina,
L Sartori,
F. Schifano,
H. Simma,
R. Tripiccione,
P. Vicini
[show abstract]
[hide abstract]
ABSTRACT: We present the current status of the apeNEXT project. Aim of this project is the development of the next generation of APE machines which will provide multi-teraflop computing power. Like previous machines, apeNEXT is based on a custom designed processor, which is specifically optimized for simulating QCD. We discuss the machine design, report on benchmarks, and give an overview on the status of the software development. Comment: 3 pages, Lattice2002(machines). Replaced for adding forgotten author
11/2002;
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F Bodin,
Ph Boucaud, N Cabibbo,
G Cascino,
F Calvayrac,
M Della Morte,
A Del Re,
R De Pietri,
P Deriso,
F Di Carlo,
others
Computer Physics Communications 01/2002; 147(1):402–409. · 3.27 Impact Factor
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F. Bodin,
P. Boucaud, N. Cabibbo,
F. Calvayrac,
M. Della Morte,
R. De Pietri,
P. De Riso,
F. Di Carlo,
F. Di Renzo,
W. Errico, [......],
O. Pene,
R. Petronzio,
D. Pleiter,
F. Rapuano,
D. Rossetti,
L Sartori,
H. Simma,
F. Schifano,
R. Tripiccione,
P. Vicini
[show abstract]
[hide abstract]
ABSTRACT: APENEXT is a new generation APE processor, optimized for LGT simulations. The project follows the basic ideas of previous APE machines and develops simple and cheap parallel systems with multi T-Flops processing power. This paper describes the main features of this new development. Comment: Lattice2001(plenary/machinestatus), 4 pages, 1 eps figure
10/2001;
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APE-Collaboration: A. Bartoloni,
P. Boucaud, N. Cabibbo,
F. Calvayrac,
M. Della Morte,
R. De Pietri,
P. De Riso,
F. Di Carlo,
F. Di Renzo,
W. Errico, [......],
F. Rapuano,
J. Rolf,
D. Rossetti,
L Sartori,
H. Simma,
F. Schifano,
M. Torelli,
R. Tripiccione,
P. Vicini,
P. Wegner
[show abstract]
[hide abstract]
ABSTRACT: This paper presents the status of the APEmille project, which is essentially completed, as far as machine development and construction is concerned. Several large installations of APEmille are in use for physics production runs leading to many new results presented at this conference. This paper briefly summarizes the APEmille architecture, reviews the status of the installations and presents some performance figures for physics codes. Comment: Lattice2001(algorithms), 3 pages, 1 eps figure
10/2001;
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R. Al Eri,
R. Di Renzo,
E. Onofri,
A Bartoloni,
C. Battista, N. Cabibbo,
M. Cosimi,
A Lonardo,
A. Michelotti,
F. Rapuano, [......],
U. Schwendicke,
H. Simma,
R. Sommer,
K. Sulanke,
P. Wegner,
A Fucci,
B Martin,
J. Pech,
E. Panizzi,
A. Petricola
08/2000;
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M. Crisafulli,
A. Donini,
V. Lubicz,
G Martinelli,
F. Rapuano,
C. Ungarelli,
A. Vladikas,
A Bartoloni,
C. Battista,
S. Cabasino, N. Cabibbo,
F Marzano,
E. Panizzi,
P. S. Paolucci,
R. Sarno,
M. Torelli,
P. Vicini
[show abstract]
[hide abstract]
ABSTRACT: ong dependence of BK on the prescription adopted for g in the Wilson case, contrary to the results of the Clover case which are almost unaffected by the choice of g. 1. Simulation. We have computed the light fermion propagators on an ensemble of 100 configurations with the Wilson action and 200 configurations with the Clover action, on a 18 3 Theta 64 lattice at fi = 6:0, using the 6-gigaflop version of APE-100. The light quark masses correspond to the hopping parameter K = 0:1530; 0:1540; 0:1550 for the Wilson action and K = 0:1425; 0:1432; 0:1440 for the Clover case. With these values, the meson masses are in the range 600 Gamma 900 MeV. We have conside
06/1998;
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M. Crisafulli,
F. Rapuano,
M. Serone,
A Bartoloni,
C. Battista,
S. Cabasino, N. Cabibbo,
E. Panizzi,
P. S. Paolucci,
R. Sarno,
G. M. Todesco,
M. Torelli,
P. Vicini
[show abstract]
[hide abstract]
ABSTRACT: Introduction The hadronic matrix element which governs the radiative decay B ! K fl is parametrised in terms of three form factors: hK r (j; k)jJ ¯ jB(p)i = C ¯ 1 T 1 (q 2 ) + iC ¯ 2 T 2 (q 2 ) + iC ¯ 3 T 3 (q 2 ); (1) where C ¯ 1 = 2ffl ¯ffaeoe j r (k) ff p ae k oe ; C ¯ 2 = j r (k)(M 2 B Gamma M 2 K
06/1998;
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APE collaboration,
A Bartoloni,
S. Cabasino, N. Cabibbo,
M. Cosimi,
P. De Riso,
W. Errico,
S. Giovannetti,
F. Laico,
H. Leich, [......],
A. Michelotti,
E. Panizzi,
P. S. Paolucci,
D. Rossetti,
U. Schwendicke,
H. Simma,
K.-H. Sulanke,
M. Torelli,
R. Tripiccione,
P. Vicini
[show abstract]
[hide abstract]
ABSTRACT: We report on the progress and status of the APEmille project: a SIMD parallel computer with a peak performance in the TeraFlops range which is now in an advanced development phase. We discuss the hardware and software architecture, and present some performance estimates for Lattice Gauge Theory (LGT) applications. Comment: Talk presented at LATTICE97, 3 pages, Latex
10/1997;
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APE collaboration: A. Bartoloni,
S. Cabasino, N. Cabibbo,
M. Cosimi,
P. De Riso,
W. Errico,
S. Giovannetti,
F. Laico,
H. Leich,
A. Lonardo, [......],
A. Michelotti,
E. Panizzi,
P. S. Paolucci,
D. Rossetti,
U. Schwendicke,
H. Simma,
K. H. Sulanke,
M. Torelli,
R. Tripiccione,
P. Vicini
[show abstract]
[hide abstract]
ABSTRACT: We report on the progress and status of the APEmille project: a SIMD
parallel computer with a peak performance in the TeraFlops range which
is now in an advanced development phase. We discuss the hardware and
software architecture, and present some performance estimates for
Lattice Gauge Theory (LGT) applications.
09/1997;
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F Aglietti,
A Bartoloni,
C Battista,
S Cabasino, N Cabibbo,
B Caporali,
E Centurioni,
M Cosimi,
W Errico,
F Laico, [......],
F Marzano,
A Michelotti,
E Panizzi,
P.S Paolucci,
F Rapuano,
W Rinaldi,
D Rossetti,
M Torelli,
R Tripiccione,
P Vicini
[show abstract]
[hide abstract]
ABSTRACT: We describe the architecture of the APEmille Parallel Computer, the new generation of the APE family of processors optimized for Lattice Gauge Theory simulations. We emphasize the features of the new machine potentially useful for applications in other areas of computational physics
Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 04/1997; 389(1-2):56-58. · 1.21 Impact Factor
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M. Crisafulli,
A. Donini,
V. Lubicz,
G Martinelli,
F. Rapuano,
C. Ungarelli,
A. Vladikas,
the APE Collaboration: A. Bartoloni,
C. Battista,
S. Cabasino, N. Cabibbo,
F Marzano,
E. Panizzi,
P. S. Paolucci,
R. Sarno,
G. M. Todesco,
M. Torelli,
P. Vicini
[show abstract]
[hide abstract]
ABSTRACT: We present results for the Kaon $B$ parameter from a sample of $200$ configurations using the Wilson action and $460$ configurations using the Clover action, on a $18^3 \times 64$ lattice at $\beta=6.0$. A slight improvement of the chiral behaviour of $B_K$ is observed due to the Clover action. We have also compared the results for $B_K$ obtained from two different procedures for the boosting of the coupling constant $g$. We observe a strong dependence of $B_K$ on the prescription adopted for $g$ in the Wilson case, contrary to the results of the Clover case which are almost unaffected by the choice of $g$. Combining some recently obtained non perturbative estimates for the renormalisation constants with our Clover matrix element, we observe a significant improvement in the chiral behaviour of $B_K$. Comment: 3 pages, Latex, Postscript file with figures available at ftp://hpteo.roma1.infn.it/pub/preprints/lat94/donini ; to appear in Lattice '94, Nucl. Phys. (Proc.Suppl.)
05/1995;
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S. Antonelli,
M. Bellacci,
R. Sarno,
A Bartoloni,
C. Battista, N. Cabibbo,
S. Cabasino,
E. Panizzi,
M. Torelli,
R. Tripiccione,
P. Vicini
[show abstract]
[hide abstract]
ABSTRACT: Polyakov type loops are responsible for the difference between quenched and unquenched finite size effects on the QCD mass spectrum. With a numerical simulation, using appropriate sea quark spatial boundary conditions, we show that we can align the phases of spatial Polyakov loops in a predefined direction. Starting from these results, we propose a procedure to minimize fluctuations due to these effects in meson propagators. 1. The finite extension of the lattice is an important source of systematic errors in lattice QCD calculations. Theoretical and numerical investigations have addressed [1, 2, 3] recently the problem of finite size effects in full lattice QCD. The conclusions of these analyses are that in the range La ¸ 0:7 Gamma 2 fm (L 4 is the number of lattice points and a is the lattice spacing) in the hadronic lattice masses there are important extra power law corrections, besides the exponentially decaying asymptotic prefactor which is due to the emission of virtual pio...
02/1995;
-
S. Antonelli,
A Bartoloni,
C. Battista,
M. Bellacci,
S. Cabasino, N. Cabibbo,
E. Panizzi,
P. S. Paolucci,
R. Sarno,
G. M. Todesco,
M. Torelli,
P. Vicini
[show abstract]
[hide abstract]
ABSTRACT: of the meson propagator [2]: G = X C k l(C) val hW (C)i + X C k l(C) val oe val hP (C)i : (1) The sums extend over all closed paths (C) of length l(C). W (C) are standard Wilson loops, completely contained into the lattice, while P (C) are Polyakov type loops and hDeltai denotes gauge field average; the value of the index oe val depends on the spatial boundary conditions on the valence quarks: oe val = +1 for periodic boundary conditions, PBC, and oe val = (Gamma1) n
02/1995;
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S. Antonelli,
A Bartoloni,
C. Battista,
M. Bellacci,
S. Cabasino, N. Cabibbo,
L. A. Fernandez,
E. Panizzi,
P. S. Paolucci,
A. Munoz Sudupe,
J. J. Ruiz-Lorenzo,
R. Sarno,
A. Tarancon,
G. M. Todesco,
M. Torelli,
P. Vicini
[show abstract]
[hide abstract]
ABSTRACT: We present numerical results obtained in full QCD with 2 flavors of Wilson fermions. We discuss the relation between the phase of Polyakov loops and the {\bf sea} quarks boundary conditions. We report preliminary results about the HMC autocorrelation of the hadronic masses, on a $16^3 \times 32$ lattice volume, at $\beta=5.55$ with $k_{sea}=0.1570$. Comment: 3 pages, compressed ps-file (uufiles), Contribution to Lattice 94
11/1994;
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C. R. Allton,
M. Crisafulli,
V. Lubicz,
G Martinelli,
F. Rapuano,
N. Stella,
A. Vladikas,
A Bartoloni,
C. Battista,
S. Cabasino, N. Cabibbo,
E. Panizzi,
P. S. Paolucci,
R. Sarno,
G. M. Todesco,
M. Torelli,
P. Vicini
[show abstract]
[hide abstract]
ABSTRACT: We present the results of a high statistics lattice calculation of hadronic form factors relevant for $D-$ and $B-$meson semi-leptonic decays into light pseudoscalar and vector mesons. The results have been obtained by averaging over 170 gauge field configurations, generated in the quenched approximation, at $\beta=6.0$, on a $18^3 \times 64$ lattice, using the $O(a)$-improved SW-Clover action.From the study of the matrix element $<K^-\vert J_\mu \vert D^0>$, we obtain $f_+ (0)=0.78\pm 0.08$ and from the matrix element $<\bar K^{* 0}\vert J_\mu \vert D^+>$ we obtain $V(0)=1.08\pm 0.22$, $A_1(0)=0.67\pm 0.11$ and $A_2(0)=0.49\pm 0.34$. We also obtain the ratios $V(0)/A_1(0)=1.6\pm 0.3$ and $A_2(0)/A_1(0)= 0.7\pm 0.4$. Our predictions for the different form factors are in good agreement with the experimental data, although, in the case of $A_2(0)$, the errors are still too large to draw any firm conclusion. With the help of the Heavy Quark Effective Theory (HQET) we have also extrapolated the lattice results to $B$-meson decays. The form factors follow a behaviour compatible with the HQET predictions. Our results are in agreement with a previous lattice calculation, performed at $\beta=6.4$, using the standard Wilson action. Comment: LaTeX, 15 pages, postscript figures attached uuencoded
11/1994;
