Analytic model of a cache-only memory architecture

An approximate analytic model of a shared memory multiprocessor with a Cache Only Memory Architecture (COMA), the busbased Data Difussion Machine (DDM), is presented and validated. It describes the timing and interference in the system as a function of the hardware, the protocols, the topology and the workload. Model results have been compared to results from an independent simulator. The comparison shows good model accuracy specially for non-saturated systems, where the errors in response times and device utilizations are independent of the number of processors and remain below 10% in 90% of the simulations. Therefore, the model can be used as an average performance prediction tool that avoids expensive simulations in the design of systems with many processors.

Reducing Cache Hierarchy Energy Consumption by Predicting Forwarding and Disabling Associative Sets

The first level data cache un modern processors has become a major consumer of energy due to its increasing size and high frequency access rate. In order to reduce this high energy con sumption, we propose in this paper a straightforward filtering technique based on a highly accurate forwarding predictor. Specifically, a simple structure predicts whether a load instruction will obtain its corresponding data via forwarding from the load-store structure -thus avoiding the data cache access - or if it will be provided by the data cache. This mechanism manages to reduce the data cache energy consumption by an average of 21.5% with a negligible performance penalty of less than 0.1%. Furthermore, in this paper we focus on the cache static energy consumption too by disabling a portin of sets of the L2 associative cache. Overall, when merging both proposals, the combined L1 and L2 total energy consumption is reduced by an average of 29.2% with a performance penalty of just 0.25%. Keywords: Energy consumption; filtering; forwarding predictor; cache hierarchy

A multi-resource load balancing algorithm for cloud cache systems

With the advent of cloud computing model, distributed caches have become the cornerstone for building scalable applications. Popular systems like Facebook [1] or Twitter use Memcached [5], a highly scalable distributed object cache, to speed up applications by avoiding database accesses. Distributed object caches assign objects to cache instances based on a hashing function, and objects are not moved from a cache instance to another unless more instances are added to the cache and objects are redistributed. This may lead to situations where some cache instances are overloaded when some of the objects they store are frequently accessed, while other cache instances are less frequently used. In this paper we propose a multi-resource load balancing algorithm for distributed cache systems. The algorithm aims at balancing both CPU and Memory resources among cache instances by redistributing stored data. Considering the possible conflict of balancing multiple resources at the same time, we give CPU and Memory resources weighted priorities based on the runtime load distributions. A scarcer resource is given a higher weight than a less scarce resource when load balancing. The system imbalance degree is evaluated based on monitoring information, and the utility load of a node, a unit for resource consumption. Besides, since continuous rebalance of the system may affect the QoS of applications utilizing the cache system, our data selection policy ensures that each data migration minimizes the system imbalance degree and hence, the total reconfiguration cost can be minimized. An extensive simulation is conducted to compare our policy with other policies. Our policy shows a significant improvement in time efficiency and decrease in reconfiguration cost.

God: Savior, Butcher, Or Oblivious Artist? The Theodicy Of Alfred North Whitehead

This paper is a critical examination of Alfred North Whitehead's attempt to solve the traditional problem of evil. Whitehead's conception of evil is crucial to his process cosmology because it is integral to his process cosmology because it is integral to his notion of creation in which evil is understood in relationship to the larger dynamic of God’s creative activity. While Whitehead’s process theodicy is interesting, he fails to successfully escape between the horns of the traditional dilemma. Whitehead is often criticized for treating evil as merely apparent. While some process philosophers, notably Maurice Barineau, have defended Whitehead from this charge, it can be shown that this is an implication of Whitehead’s approach. Moreover, Whitehead’s theodicy fails to address radical moral evil in its concrete dimension in respect to real human suffering. As a result, Whitehead’s theodicy is not relevant to Christian theology. My paper is divided into two parts. I will first briefly discuss the traditional problem of evil and some of the traditional problem of evil and some of the traditional solutions proposed to resolve it. The reminder of the paper will demonstrate why Whitehead’s theodicy addresses the traditional problem of evil only at the expense of theological irrelevancy.

Study and evaluation of several cache replacement policies on a commercial MIPS Processor

Actualmente, el rendimiento de los computadores es un tema candente. Existen importantes limitaciones físicas y tecnológicas en los semiconductores de hoy en día, por lo que se realiza un gran esfuerzo desde las universidades y la industria para garantizar la continuidad de la ley de Moore. Este proyecto está centrado en el estudio de la cache y la jerarquía de memoria, uno de los grandes temas en la materia. Para ello, hemos escogido MIPSfpga, una plataforma hardware abierta de Imagination Technologies, lo que nos ha permitido implementar y testear diferentes políticas de reemplazamiento como prueba de concepto, demostrando, además, las bondades de la plataforma.

Tutankhamun's Embalming Cache (KV 54), excavated artifact, Floral Collar

Valley of the Kings (burial site), Egypt; 1 ft. 5 21/64 in.x 49 ft. 4 33/64 in.; papyrus, olive leaves, cornflowers, linen

Tutankhamun's Embalming Cache (KV 54), excavated artifact, Floral Collar

Valley of the Kings (burial site), Egypt; 1 ft. 3 3/4 in.x 6 11/16 in.; papyrus,olive & persea leaves, cornflowers,blue lotus petals Picris flowers, nightshade berries, faience & linen

Tutankhamun's Embalming Cache (KV 54), excavated artifact, Floral Collar: detail

Valley of the Kings (burial site), Egypt; papyrus, olive leaves, cornflowers, linen

Tutankhamun's Embalming Cache (KV 54), excavated artifact, Floral Collar: detail

Valley of the Kings (burial site), Egypt; papyrus, olive leaves, cornflowers, linen

Tutankhamun's Embalming Cache (KV 54), excavated artifact, Floral Collar: back

Valley of the Kings (burial site), Egypt; 1 ft. 5 21/64 in.x 49 ft. 4 33/64 in.; papyrus, olive leaves, cornflowers, linen

Recueil de pieces importantes sur l'operation de la taille, faite par le lithotome cache : avec un memoire concernant la retention d'urine, causée par l'embarras du canal de l'uretre.

Mode of access: Internet.

Études sur l'infanticide et la grossesse cachée ou simulée /

Mode of access: Internet.

Cache la poudre : the romance of a tenderfoot in the days of Custer /

Mode of access: Internet.

An intensive survey of the Cache River Basin, summer 1992 /

"IEPA/WPC/95-013."--Cover.

An assessment of the water quality of the Cache River Basin derived from a biological investigation /

"Prepared for the Illinois Environmental Protection Agency."