Descriptor: "p-states" - Searchworks@Jio Institute Digital Library Search Results

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127 results on '"p-states"'

1. COUNTDOWN: A Run-Time Library for Performance-Neutral Energy Saving in MPI Applications.

Author: Cesarini, Daniele, Bartolini, Andrea, Bonfa, Pietro, Cavazzoni, Carlo, and Benini, Luca
Subjects: *ENERGY consumption, *SYNCHRONIZATION, *ELECTRIC power conservation, *ESPRESSO
Abstract: Power and energy consumption are becoming key challenges for the supercomputers’ exascale race. HPC systems’ processors waist active power during communication and synchronization among the MPI processes in large-scale HPC applications. However, due to the time scale at which communication happens, transitioning into low-power states while waiting for the completion of each communication may introduce unacceptable overhead. In this article, we present COUNTDOWN, a run-time library for identifying and automatically reducing the power consumption of the CPUs during communication and synchronization. COUNTDOWN saves energy without penalizing the time-to-completion by lowering CPUs power consumption only during idle times for which power state transition overhead is negligible. This is done transparently to the user, without requiring labor-intensive and error-prone application code modifications, nor requiring recompilation of the application. We test our methodology on a production Tier-1 system. For the NAS benchmarks, COUNTDOWN saves between 6 and 50 percent energy, with a time-to-solution penalty lower than 5 percent. In a complete production—Quantum ESPRESSO—for a 3.5K cores run, COUNTDOWN saves 22.36 percent energy, with a performance penalty below 3 percent. Energy saving increases to 37 percent with a performance penalty of 6.38 percent, if the application is executed without communication tuning. [ABSTRACT FROM AUTHOR]
Published: 2021
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2. COUNTDOWN - A Run-time Library for Application-agnostic Energy Saving in MPI Communication Primitives

Author: Carlo Cavazzoni, Andrea Bartolini, Piero Bonfà, Daniele Cesarini, Luca Benini, Carlo Cavazzoni, Andrea Bartolini, Daniele Cesarini, Luca Benini, Piero Bonfà, Bartolini, Andrea, Cardoso, João M.P., and Silvano, Cristina
Subjects: Power management, DDCM, HPC, MPI, profiling, power management, idleness, DVFS, C-states, P-states, T-states, hardware performance counters, timer, energy saving, power saving, Computer science, 02 engineering and technology, Synchronization (computer science), 0202 electrical engineering, electronic engineering, information engineering, Countdown, Code (cryptography), Profiling (computer programming), business.industry, 020208 electrical & electronic engineering, HPC, MPI, profiling, power management, idleness, DVFS, DDCM, C-states, P-states, T-states, hardware performance counters, timer, energy saving, power saving, Energy consumption, 020202 computer hardware & architecture, Filter (video), Embedded system, Timer, business
Abstract: Energy and power consumption are prominent issues in today’s supercomputers and are foreseen as a limiting factor of future installations. In scientific computing, a significant amount of power is spent in the communication and synchronization-related idle times among distributed processes participating to the same application. However, due to the time scale at which communication happens, taking advantage of low-power states to reduce power in idle times in the computing resources, may introduce significant overheads. In this paper we present COUNTDOWN, a methodology and a tool for identifying and automatically reducing the frequency of the computing elements in order to save energy during communication and synchronization primitives. COUNTDOWN is able to filter out phases which would detriment the time to solution of the application transparently to the user, without touching the application code nor requiring recompilation of the application. We tested our methodology in a production Tier-0 system, a production application - Quantum ESPRESSO (QE) - with production datasets which can scale up to 3.5K cores. Experimental results show that our methodology saves 22.36% of energy consumption with a performance penalty of 2.88% in real production MPI-based application., ANDARE '18 Proceedings of the 2nd Workshop on AutotuniNg and aDaptivity AppRoaches for Energy efficient HPC Systems, ISBN:978-1-4503-6591-8
Published: 2018
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3. Benefits in Relaxing the Power Capping Constraint

Author: Andrea Bartolini, Luca Benini, Daniele Cesarini, Cesarini, Daniele, Bartolini, Andrea, and Benini, Luca
Subjects: 010302 applied physics, Power management, Speedup, Computer science, Distributed computing, 02 engineering and technology, RAPL, power capping, 01 natural sciences, Power budget, 020202 computer hardware & architecture, Frequency allocation, Power (physics), Constraint (information theory), monitoring, hardware performance counters, monitoring, HPC, P-states, RAPL, power capping, DVFS, power management, hardware performance counters, HPC, 0103 physical sciences, DVFS, P-states, power management, 0202 electrical engineering, electronic engineering, information engineering
Abstract: Proceedings of the 1st Workshop on AutotuniNg and aDaptivity AppRoaches for Energy efficient HPC Systems, ISBN:978-1-4503-5363-2
Published: 2017
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4. Observation of the P-1(1) state of charmonium

Author: Rubin, P., Cawlfield, C., Eisenstein, B. I., Gollin, G. D., Karliner, I., Kim, D., Lowrey, N., Naik, P., Sedlack, C., Selen, M., White, E. J., Williams, J., Wiss, J., Edwards, K. W., Besson, D., Pedlar, T. K., Cronin-Hennessy, D., Gao, K. Y., Gong, D. T., Hietala, J., Kubota, Y., Klein, T., Lang, B. W., Li, S. Z., Poling, R., Scott, A. W., Smith, A., Dobbs, S., Metreveli, Z., Seth, K. K., Tomaradze, A., Zweber, P., Ernst, J., Mahmood, A. H., Severini, H., Asner, D. M., Dytman, S. A., Love, W., Mehrabyan, S., Mueller, J. A., Savinov, V., Li, Z., Lopez, A., Mendez, H., Ramirez, J., Huang, G. S., Miller, D. H., Pavlunin, V., Sanghi, B., Shipsey, I. P. J., Adams, G. S., Cravey, M., Cummings, J. P., Danko, I., Napolitano, J., He, Q., Muramatsu, H., Park, C. S., Park, W., Thorndike, E. H., Coan, T. E., Gao, Y. S., Liu, F., Artuso, M., Boulahouache, C., Blusk, S., Butt, J., Dorjkhaidav, O., Li, J., Menaa, N., Mountain, R., Nandakumar, R., Randrianarivony, K., Redjimi, R., Sia, R., Skwarnicki, T., Stone, S., Wang, J. C., Zhang, K., Csorna, S. E., Bonvicini, G., Cinabro, D., Dubrovin, M., Briere, R. A., Chen, G. P., Chen, J., Ferguson, T., Tatishvili, G., Vogel, H., Watkins, M. E., Rosner, J. L., Adam, N. E., Alexander, J. P., Berkelman, K., Cassel, D. G., Crede, V., Duboscq, J. E., Ecklund, K. M., Ehrlich, R., Fields, L., Galik, R. S., Gibbons, L., Gittelman, B., Gray, R., Gray, S. W., Hartill, D. L., Heltsley, B. K., Hertz, D., Jones, C. D., Kandaswamy, J., Kreinick, D. L., Kuznetsov, V. E., Mahlke-Kruger, H., Meyer, T. O., Onyisi, P. U. E., Patterson, J. R., Peterson, D., Phillips, E. A., Pivarski, J., Riley, D., Ryd, A., Sadoff, A. J., Schwarthoff, H., Shi, X., Shepherd, M. R., Stroiney, S., Sun, W. M., Urner, D., Wilksen, T., Weaver, K. M., Weinberger, M., Athar, S. B., Avery, P., Breva-Newell, L., Patel, R., Potlia, V., Stoeck, H., and Yelton, J.
Subjects: relativistic quark-model, heavy-quarkonium, hadronic transitions, e&e annihilation, potential model, light mesons, bound-states, p-states, qcd, spectroscopy
Abstract: The spin-singlet P-wave state of charmonium, h(c)(P-1(1)), has been observed in the decay psi(2S)->pi(0)h(c) followed by h(c)->gamma eta(c). Inclusive and exclusive analyses of the M(h(c)) spectrum have been performed. Two complementary inclusive analyses select either a range of energies for the photon emitted in h(c)->gamma eta(c) or a range of values of M(eta(c)). These analyses, consistent with one another within statistics, yield M(h(c))=[3524.9 +/- 0.7 (stat)+/- 0.4 (sys)] MeV/c(2) and a product of the branching ratios B-psi(psi(2S)->pi(0)h(c))xB(h)(h(c)->gamma eta(c))=[3.5 +/- 1.0 (stat)+/- 0.7 (sys)]x10(-4). When the eta(c) is reconstructed in seven exclusive decay modes, 17.5 +/- 4.5 h(c) events are seen with an average mass M(h(c))=[3523.6 +/- 0.9 (stat)+/- 0.5 (sys)] MeV/c(2), and BpsiBh=[5.3 +/- 1.5 (stat)+/- 1.0 (sys)]x10(-4). If combined, the inclusive and exclusive data samples yield an overall mass M(h(c))=[3524.4 +/- 0.6 (stat)+/- 0.4 (sys)] MeV/c(2) and product of branching ratios BpsiBh=[4.0 +/- 0.8 (stat)+/- 0.7 (sys)]x10(-4). The h(c) mass implies a P-wave hyperfine splitting Delta M-HF(1P)equivalent to < M(1(3)P)>-M(1(1)P(1))=[1.0 +/- 0.6 (stat)+/- 0.4 (sys)] MeV/c(2).
Published: 2005