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<italic>This paper examines the problem of data placement in Bubba, a highly-parallel system for data-intensive applications being developed at MCC. &#8220;Highly-parallel&#8221; implies that load balancing is a critical performance issue. &#8220;Data-intensive&#8221; means data is so large that operations should be executed where the data resides. As a(More)
<italic>In dataflow architectures, each dataflow operation is typically executed on a single physical node. We are concerned with distributed data-intensive systems, in which each base (i.e., persistent) set of data has been declustered over many physical nodes to achieve load balancing. Because of large base set size, each operation is executed where the(More)
<italic>The same application implemented on different systems will necessarily present different workloads to the systems. Characterizations of workloads intended to represent the same application, but input to models of different systems, must also differ in analogous ways. We present a hierarchical method for characterizing a workload at increasing levels(More)
<italic>In dataflow architectures, each dataflow node (i.e., operation) is typically executed on a single physical node. We are concerned with distributed data-intensive systems, in which each base (i.e., persistent) set of data has been declustered over many physical nodes to achieve load balancing. Because of large base set size, each operation is(More)
Multiwalled carbon nanotubes (MWCNT) have a fibrous structure and physical properties similar to asbestos and have been shown to induce malignant mesothelioma of the peritoneum after injection into the scrotum or peritoneal cavity in rats and mice. For human cancer risk assessment, however, data after administration of MWCNT via the airway, the exposure(More)
Performance modeling and analysis of computer systems are often ignored during the project design phase in favor of other techniques collectively known as structured design or software engineering. We describe benefits that can result from including performance analysis as an integral part of the design process. Several different goals, time frames, and(More)