David R. Swanson

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In this paper, we investigate an efficient off-line scheduling algorithm in which real-time tasks with precedence constraints are xecuted in a heterogeneous environment. It provides more features and capabilities than existing algorithms that schedule only independent tasks in real-time homogeneous ystems. In addition, the proposed algorithm takes the(More)
In this paper, we describe the design and implementation of an UDP-based socket that utilizes multiple network interface units connected through one or more networks. The socket is a middleware layer that provides abstract network APIs to hide low-level technical details from users. Parallel message fragmentation and reconstruction techniques and a reliable(More)
Without any additional hardware, CEFT-PVFS utilizes the existing disks on each cluster node to provide RAID-10 style parallel I/O service. In CEFT-PVFS, all servers are also computational nodes and can be heavily loaded by different applications running on the cluster, thus potentially degrading the I/O performance. To minimize the degradation, I/O requests(More)
The current technologies have made it possible to execute parallel applications across heterogeneous platforms. However, the performance models available do not provide adequate methods to calculate, compare and predict the applications performance on these platforms. In this paper, we discuss an enhanced performance evaluation model for parallel(More)
Load balancing in a workstation-based cluster system has been investigated extensively, mainly focusing on the effective usage of global CPU and memory resources. However, if a significant portion of applications running in the system is I/O-intensive, traditional load balancing policies can cause system performance to decrease substantially. In this paper,(More)
In this paper, we introduce a middleware infrastructure that provides software services for developing and deploying highperformance parallel programming models and distributed applications on clusters and networked heterogeneous systems. This middleware infrastructure utilizes distributed agents residing on the participating machines and communicating with(More)
Recently there has been an increasing interest in developing parallel programming capabilities in Java to harness the vast resources available in clusters, grids and heterogeneous networked systems. In this paper, we introduce a Java object-passing interface (JOPI) library. JOPI provides Java programmers with the necessary functionality to write(More)
Due to the ever-widening performance gap between processors and disks, I/O operations tend to become the major performance bottleneck of data-intensive applications on modern clusters. If all the existing disks on the nodes of a cluster are connected together to establish high performance parallel storage systems, the cluster’s overall performance can be(More)
In this paper, a new I/O-aware load-balancing scheme is presented to improve overall performance of a distributed system with a general and practical workload including I/O activities. The proposed scheme dynamically detects I/O load imbalance on nodes of a distributed system and determines whether to migrate the I/O requests of some jobs from overloaded(More)