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(1 - 3 of 3)
- Title
- OFF-CHIP COMMUNICATIONS ARCHITECTURES FOR HIGH THROUGHPUT NETWORK PROCESSORS.
- Creator
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Engel, Jacob, Kocak, Taskin, University of Central Florida
- Abstract / Description
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In this work, we present off-chip communications architectures for line cards to increase the throughput of the currently used memory system. In recent years there is a significant increase in memory bandwidth demand on line cards as a result of higher line rates, an increase in deep packet inspection operations and an unstoppable expansion in lookup tables. As line-rate data and NPU processing power increase, memory access time becomes the main system bottleneck during data store/retrieve...
Show moreIn this work, we present off-chip communications architectures for line cards to increase the throughput of the currently used memory system. In recent years there is a significant increase in memory bandwidth demand on line cards as a result of higher line rates, an increase in deep packet inspection operations and an unstoppable expansion in lookup tables. As line-rate data and NPU processing power increase, memory access time becomes the main system bottleneck during data store/retrieve operations. The growing demand for memory bandwidth contrasts the notion of indirect interconnect methodologies. Moreover, solutions to the memory bandwidth bottleneck are limited by physical constraints such as area and NPU I/O pins. Therefore, indirect interconnects are replaced with direct, packet-based networks such as mesh, torus or k-ary n-cubes. We investigate multiple k-ary n-cube based interconnects and propose two variations of 2-ary 3-cube interconnect called the 3D-bus and 3D-mesh. All of the k-ary n-cube interconnects include multiple, highly efficient techniques to route, switch, and control packet flows in order to minimize congestion spots and packet loss. We explore the tradeoffs between implementation constraints and performance. We also developed an event-driven, interconnect simulation framework to evaluate the performance of packet-based off-chip k-ary n-cube interconnect architectures for line cards. The simulator uses the state-of-the-art software design techniques to provide the user with a flexible yet robust tool, that can emulate multiple interconnect architectures under non-uniform traffic patterns. Moreover, the simulator offers the user with full control over network parameters, performance enhancing features and simulation time frames that make the platform as identical as possible to the real line card physical and functional properties. By using our network simulator, we reveal the best processor-memory configuration, out of multiple configurations, that achieves optimal performance. Moreover, we explore how network enhancement techniques such as virtual channels and sub-channeling improve network latency and throughput. Our performance results show that k-ary n-cube topologies, and especially our modified version of 2-ary 3-cube interconnect - the 3D-mesh, significantly outperform existing line card interconnects and are able to sustain higher traffic loads. The flow control mechanism proved to extensively reduce hot-spots, load-balance areas of high traffic rate and achieve low transmission failure rate. Moreover, it can scale to adopt more memories and/or processors and as a result to increase the line card's processing power.
Show less - Date Issued
- 2005
- Identifier
- CFE0000734, ucf:46581
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0000734
- Title
- EXPLORING THE DIFFERENCES BETWEEN PRE-SERVICE AND IN-SERVICE TEACHERS' ANALYSES OF VARIOUS INFORMAL READING INVENTORY RESULTS IN THE ELEMENTARY GRADES.
- Creator
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Miller, Tara, Wenzel, Taylar, University of Central Florida
- Abstract / Description
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Reading is a fundamental skill in our modern society; being able to read with comprehension and fluency is an important skill in all core academic subjects. Reading teachers are charged with the task to analyze student data in order to drive their instructional decisions. Informal Reading Inventories (IRIs) are one type of an informal reading assessment that teachers can use in the classroom to learn about student reading behaviors and drive instruction. Informal Reading Inventories assess...
Show moreReading is a fundamental skill in our modern society; being able to read with comprehension and fluency is an important skill in all core academic subjects. Reading teachers are charged with the task to analyze student data in order to drive their instructional decisions. Informal Reading Inventories (IRIs) are one type of an informal reading assessment that teachers can use in the classroom to learn about student reading behaviors and drive instruction. Informal Reading Inventories assess fluency and comprehension. Research suggests that fluency and comprehension have a reciprocal relationship; meaning, if you improve one skill, you improve the other skill simultaneously (DeVries, 2011). This study explored how pre-service teachers, college students in an education program, and in-service teachers, veteran teachers, analyzed data from various IRIs. This study also explored how three separate IRIs, the Qualitative Reading Inventory (QRI), the Basic Reading Inventory (BRI), and the Analytical Reading Inventory (ARI), compared to one another. There were four participants in this study: two undergraduate students in an elementary education program reading class and two veteran classroom teachers. This study found that the grade level readability of the passages are inconsistent with the reading level they claim to be. An inconsistency like this is something to note as many teachers only use these resources on which they were trained during their college education. This study also found that the length of the IRI passages had an effect on the student's words correct per minute (WCPM); the longer the passage, the lower the WCPM. This is probably due to the fact that students need more time to process a passage for the sake of comprehension.
Show less - Date Issued
- 2015
- Identifier
- CFH0004888, ucf:45414
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFH0004888
- Title
- Stefano Landi's Arie a una voce and Early Seventeenth-century Italian Guitar Music with Alfabeto Notation.
- Creator
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Galfond, Nicholas, Warfield, Scott, Koons, Keith, Brunner, David, University of Central Florida
- Abstract / Description
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In the first few decades of the seventeenth century countless songbooks were published in Italy, more than 300 of which included the notation system for guitar accompaniment known as alfabeto. This early repertoire for the five-course Spanish guitar was printed mostly in Naples, Rome, and Florence, and was a pivotal precursor to our modern tonal musical understanding. The very nature of both the instrument and its characteristic dance-song accompaniment style led composers to create block...
Show moreIn the first few decades of the seventeenth century countless songbooks were published in Italy, more than 300 of which included the notation system for guitar accompaniment known as alfabeto. This early repertoire for the five-course Spanish guitar was printed mostly in Naples, Rome, and Florence, and was a pivotal precursor to our modern tonal musical understanding. The very nature of both the instrument and its characteristic dance-song accompaniment style led composers to create block harmonies in diatonic progressions long before such concepts bore any semblance to a functioning theory.This paper uses the 1620 publication Arie a una voce by Roman composer Stefano Landi as a case study through which to examine the important roles that both alfabeto and the guitar played in the development of monody. The ongoing debates over the practicality, authorship, and interpretation of alfabeto notation are all addressed in reference to the six pieces marked (")per la chitara Spag.(") found near the end of Landi's first songbook. This will provide an understanding of the alfabeto notation system as well as the role of the guitar in the rise of monody, provide more specific answers concerning the viability of accompanying these specific songs on the guitar, and provide a means for constructing an informed interpretation and recording of these examples of a long-overlooked repertoire.
Show less - Date Issued
- 2015
- Identifier
- CFE0005950, ucf:50802
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0005950
