Power Saving in Regular Interconnection Networks Built with High-Degree Switches

Alonso, Marina; Martínez, J.M.; Santonja, V.; López, Pedro; Duato, J.

doi:10.1109/ipdps.2005.349

Cited by 18 publications

(17 citation statements)

References 9 publications

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“…Alonso et al [8] propose a power saving mechanism for regular interconnection networks that are built with a high degree switches, where each network dimension is formed of various links in parallel. The idea is to turn off and on the links that compose trunk link as a function of network traffic.…”

Section: Related Workmentioning

confidence: 99%

“…Now we would speed-up the reactivation of links (≈ 100ns) but with a cost of much lower power saving potential [3]. Both power aware methodologies typically use hardware prediction schemes for shifting between power modes [6], [7], [8]. These schemes have a common drawback that their effectiveness is largely dependent on their prediction accuracy.…”

Section: Introductionmentioning

confidence: 99%

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Software-Managed Power Reduction in Infiniband Links

Dickov

Pericàs

Carpenter

et al. 2014

2014 43rd International Conference on Parallel Processing

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Abstract-Interconnection network represents the backbone of large-scale supercomputers. While the computation has become more energy proportional, the interconnection network has started to become one of the important consumers in the system. Still, interconnection network has received little attention in terms of efficient power consumption. Several hardware-based schemes have been proposed that function either by turning off the links or lowering the voltage/frequency in links when idle or with low usage. Although effective in certain cases, these schemes share the common drawback that they do not have enough global information about the application to manage network power efficiently. This paper, instead, proposes a software prediction support for shutting down inactive lanes of an Infiniband (IB) link.Using n-gram extraction technique as a core of the prediction algorithm we are able to predict with high accuracy when links will be unused. The prediction algorithm detects the repeating patterns of MPI calls during the program execution, on which basis the prediction of the following MPI calls can be realized with relatively high precision. This allow us to know on time when links will be active/idle and invoke the explicit turn-off/on lanes calls. Our power saving mechanism is adopted to be executed within MPI allowing a large number of existing MPI programs to be run without any source code modification. Results show an average power savings in IB switches up to around 33% over the representative HPC applications. On the other hand, HPC applications average suffer only up to 1% increase in execution time.

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Section: Related Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Software-Managed Power Reduction in Infiniband Links

Dickov

Pericàs

Carpenter

et al. 2014

2014 43rd International Conference on Parallel Processing

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“…In this research, following the papers [7][8][9], we aim a threshold-based switching policy to minimize the mean power consumption, which is an important metric of the modern server farms working under power constraints. This problem can also be reformulated as the minimization of the long-run average cost under a given policy and is closely connected with the power optimization, discussing for instance in [2,5,6]. We also study the dependence between the mean workload and the switching threshold in stable regime.…”

Section: Introductionmentioning

confidence: 99%

A State-Dependent Control for Green Computing

Morozov

Rumyantsev

2015

Lecture Notes in Electrical Engineering

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In this paper, we consider a state-dependent mechanism which can be used to reduce mean power consumption in modern communication and computer systems. This mechanism allows to change flexibly the service rate so as to increase the energy efficiency of the system. We focus on computer systems with sojourn time dependent service rate, and present a new regenerative proof of the sufficient stability conditions for a wide class of such systems. We develop both performance analysis in stationary regime and asymptotic analysis of the mean power consumption as the switching threshold increases. Some numerical results are presented and discuss in detail.

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“…Este factor, resultado del producto de tiempo por potencia, ofrece una indicación del ahorro medio de energía consumida para las condiciones testeadas. El indicador L rel × P rel se trata de una contribución original de esta tesis [18] que ha sido posteriormente empleado por otros equipos de investigación [53].…”

Section: Efecto De La Longitud De Los Mensajesunclassified

Una estrategia para la reducción del consumo de potencia en redes de interconexión

Díaz¹

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A Joan y Salva, siempre sereis mi prioridad... Papá, mamá... gracias por estar siempre justo en el sitio en que os necesito... A Salva, porque nunca has dejado que termine un día sin hacerme más feliz, sin enseñarme de quien realmente puedo aprender... Una estrategia para la reducción del consumo de potencia en redes de interconexión Marina Alonso Díaz ResumenEl alto nivel de potencia de cálculo requerida por algunas aplicaciones sólo puede ser alcanzado por sistemas multiprocesador. Estos sistemas consisten en varios procesadores que se comunican mediante una red de interconexión. El enorme aumento tanto en el tamaño como la complejidad de los sistemas multiprocesador ha disparado su consumo de energía. Las técnicas de reducción de consumo de potencia se están aplicando a todos los niveles en los computadores y la red de interconexión no puede ser una excepción.En este entorno, las redes de interconexión más ampliamente utilizadas están basadas en topologías regulares: directas, como los toros, e indirectas, como los fat-tree.En ambos casos el consumo de potencia de la circuitería de la red de interconexión contribuye significativamente al total del sistema.En esta tesis, proponemos una estrategia para reducir el consumo de potencia en las redes de interconexión, tanto directas como indirectas. Dicha estrategia se materializa en forma de un mecanismo que combina dos técnicas alternativas: (i) la conexión y desconexión dinámica de los enlaces de la red en función del tráfico (cualquier enlace puede ser desconectado, con tal de que la conectividad de red esté garantizada), (ii) el ajuste dinámico del ancho de banda de los enlaces en función del tráfico. En ambos casos, la topología de la red no se ve modificada. Por lo tanto, el mismo algoritmo de encaminamiento puede ser usado independientemente de las acciones de ahorro en el consumo llevadas a cabo, simplificando así el diseño del router.Nuestros resultados muestran que el consumo de potencia de la red se puede reducir muy significativamente, a costa de algún incremento en la latencia. Sin embargo, la reducción de potencia alcanzada es siempre mayor que la penalización en la latencia. A Strategy for Power Saving in Interconnection NetworksMarina Alonso Díaz AbstractThe high level of computing power required for some applications can only be achieved by multiprocessor systems. These systems consist of several processors that communicate by means of an interconnection network. The huge increase both in size and complexity of high-end multiprocessor systems has triggered up their power consumption. Power consumption reduction techniques are being applied everywhere in computer systems and the interconnection network must not be an exception. In this scenario, the most widely used interconnection networks are based on regular topologies: direct topologies, as torus, and indirect topologies, as fat-tree. In both cases the power consumed by the interconnect circuitry has a non-negligible contribution to the total system budget. In this thesis, we propose a strategy ...

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Power Saving in Regular Interconnection Networks Built with High-Degree Switches

Cited by 18 publications

References 9 publications

Software-Managed Power Reduction in Infiniband Links

Software-Managed Power Reduction in Infiniband Links

A State-Dependent Control for Green Computing

Una estrategia para la reducción del consumo de potencia en redes de interconexión

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