Packet scheduling is an essential element of any QoS enabled packet-switched network. (QoS provisioning and packet scheduling play important roles in present and future Internet applications.) In terms of packet fair ...
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This paper explores the problem of efficiently ordering inter-processor communication operations in both statically and dynamically-scheduled multiprocessors for iterative dataflow graphs with probabilistic execution ...
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ISBN:
(纸本)1595930914
This paper explores the problem of efficiently ordering inter-processor communication operations in both statically and dynamically-scheduled multiprocessors for iterative dataflow graphs with probabilistic execution times. In most digital signal processing applications, the throughput of the system is significantly affected by communication costs. We explicitly model these costs within an effective graph-theoretic analysis framework. We show that ordered transaction schedules can significantly outperform both self-timed schedules and dynamic schedules for moderate task execution time variability. As the task execution time variability increases, we show that first self-timed and then dynamic scheduling policies are preferred. We perform an extensive experimental comparison on both real and simulated benchmarks to gauge the effect of synchronization and communication over-head costs on these crossover points. Copyright 2005 ACM.
Using a communication network, such as an IP network, in the control loop is increasingly becoming the norm. This process of network-based control (NBC) has a potentially profound impact in areas such as: teleoperatio...
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Open MPI is a project recently initiated to provide a fault-tolerant, multi-network capable implementation of MPI-2 [16], based on experiences gained from FT-MP1 [7], LA-MPI [10], LAM/MPI [23], and MVAPICH [18] projec...
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ISBN:
(纸本)0769523129
Open MPI is a project recently initiated to provide a fault-tolerant, multi-network capable implementation of MPI-2 [16], based on experiences gained from FT-MP1 [7], LA-MPI [10], LAM/MPI [23], and MVAPICH [18] projects. Its initial communication architecture is layered on top of TCP/IP. In this paper, we have designed and implemented Open MPI point-to-point layer on top of a high-end interconnect, Quadrics/Elan4 [21]. The restriction of Quadrics static process model has been overcome to accommodate the requirement of MPI-2 dynamic process management. Quadrics Queued-based Direct Memory Access (QDMA) and Remote Direct Memory Access (RDMA) mechanisms have been integrated to form a low-overhead, high-performance transport layer. Light-weight asynchronous progress is made possible with a combination of Quadrics chained event and QDMA mechanisms. Experimental results indicate that the resulting point-to-point transport layer is able to achieve comparable performance to Quadrics native QDMA operations, from which it is derived. Our implementation provides an MPI-2 compliant message passing library over Quadrics/Elan4 with a performance comparable to MPICH-Quadrics.
Home service robots have received much attention from both academia and industry because home service robots have wide range of potential applications such as home security, cleaning, etc. The robots need to add or up...
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The capacity region of multiple-input multipleoutput (MIMO) broadcast channel (BC) has attracted considerable attention recently. The greedy block MMSE QR decomposition with dirty paper coding (greedy block MMSE-DP) s...
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IETF Mobile IPv6 allows nodes to perform an IP handover without breaking their active sessions. In Mobile IPv6, after re-associating a new attachment of point, it is generally the responsibility of a mobile node to de...
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A double side converter fed wound rotor induction machine control for a wind energy application is proposed in this paper. In order to reduce the cost of a wind generator system, a new configuration using half control...
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In this paper, we propose a novel active queue management (AQM) scheme based on the Random Early Detection (RED) of the loss ratio and the total sending rate control, called LRC-RED, to regulate the queue length with ...
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ISBN:
(纸本)0769524052
In this paper, we propose a novel active queue management (AQM) scheme based on the Random Early Detection (RED) of the loss ratio and the total sending rate control, called LRC-RED, to regulate the queue length with small variation and to achieve high utilization with small packet loss. This scheme measures the latest packet loss ratio, and uses it and the total sending rate as complements to queue length in order to dynamically adjust packet drop probability. Further, we also provide the design rules for this scheme based on the well-known TCP control model. On the basis of the design rules, we develop a simple, scalable and systematic rule for tuning the control parameters which can be adaptive to dynamic network conditions. Through ns 2 simulations, we show the faster response time and better robustness of the proposed LRC-RED as compared with the Loss Ratio based RED (LRED) [5] algorithm.
Service providing as an important activity in service-oriented architecture, which is the most popular architecture for applications of distributed environments needs a change to obtain better efficiency, so in this p...
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Service providing as an important activity in service-oriented architecture, which is the most popular architecture for applications of distributed environments needs a change to obtain better efficiency, so in this paper we present neighbor providing and extended neighbor providing (ENP) methods, which are apply the neighborhood computing in traditional methods. As evaluation of these methods we use the efficiency, scalability, and reliability metrics obtained from the results of omnet++ simulation and we measured the users' satisfactions with their opinions about the quality of implemented ENP system
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