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We study the 2-dimensional vector packing problem, which is a generalization of the classical bin packing problem where each item has 2 distinct weights and each bin has 2 corresponding capacities. The goal is to group items into minimum number of bi
Externí odkaz:
http://arxiv.org/abs/1103.0260
Akademický článek
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Autor:
Otoo, Ekow
Publikováno v:
Otoo, Ekow. (2010). Workload-Adaptive Management of Energy-Smart Disk Storage Systems. Lawrence Berkeley National Laboratory. Lawrence Berkeley National Laboratory: Lawrence Berkeley National Laboratory. Retrieved from: http://www.escholarship.org/uc/item/18k8082k
Recent studies have identified disk storage systems as one of the major consumers of power in data centers. Many disk power management (DPM) schemes were suggested where the power consumed by disks is reduced by spinning them down during long idle pe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od_______325::d30e1edce1a6bc5ae258c052f9c51b9f
http://www.escholarship.org/uc/item/18k8082k
http://www.escholarship.org/uc/item/18k8082k
Autor:
Otoo, Ekow
Publikováno v:
Otoo, Ekow. (2009). Energy Smart Management of Scientific Data. Lawrence Berkeley National Laboratory. Lawrence Berkeley National Laboratory: Lawrence Berkeley National Laboratory. Retrieved from: http://www.escholarship.org/uc/item/30k0p2mp
Scientific data centers comprised of high-powered computing equipment and large capacity disk storage systems consume considerable amount of energy. Dynamic power management techniques (DPM) are commonly used for saving energy in disk systems. These
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od_______325::5322b9c55e178aaf73aa2ff3058c87c8
http://www.escholarship.org/uc/item/30k0p2mp
http://www.escholarship.org/uc/item/30k0p2mp
Autor:
Otoo, Ekow J
Publikováno v:
Otoo, Ekow J. (2009). Analysis of Trade-Off Between Power Saving and Response Time in Disk Storage Systems. Lawrence Berkeley National Laboratory. Lawrence Berkeley National Laboratory: Lawrence Berkeley National Laboratory. Retrieved from: http://www.escholarship.org/uc/item/66b1s76v
It is anticipated that in the near future disk storage systems will surpass application servers and will become the primary consumer of power in the data centers. Shutting down of inactive disks is one of the more widespread solutions to save power c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od_______325::f13937b3566a250b1acbf5571313c9b8
http://www.escholarship.org/uc/item/66b1s76v
http://www.escholarship.org/uc/item/66b1s76v
Autor:
Otoo, Ekow, Wu, Kesheng
Publikováno v:
Otoo, Ekow; & Wu, Kesheng. (2009). Accelerating Queries on Very Large Datasets. Scientific Data Management: Challenges, Existing Technology, and Deployment. Lawrence Berkeley National Laboratory: Lawrence Berkeley National Laboratory. Retrieved from: http://www.escholarship.org/uc/item/3gb2f3wp
In this chapter, we explore ways to answer queries on large multi-dimensional data efficiently. Given a large dataset, a user often wants to access only a relatively small number of the records. Such a selection process is typically performed through
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od_______325::6391cadd3126539df8d00a65586148ef
http://www.escholarship.org/uc/item/3gb2f3wp
http://www.escholarship.org/uc/item/3gb2f3wp
Autor:
Otoo, Ekow J
Publikováno v:
Otoo, Ekow J. (2009). Parallel Access of Out-Of-Core Dense Extendible Arrays. Lawrence Berkeley National Laboratory. Lawrence Berkeley National Laboratory: Lawrence Berkeley National Laboratory. Retrieved from: http://www.escholarship.org/uc/item/7s41c7t5
Datasets used in scientific and engineering applications are often modeled as dense multi-dimensional arrays. For very large datasets, the corresponding array models are typically stored out-of-core as array files. The array elements are mapped onto
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od_______325::0f711d43ef6438132f79a19761b4a2ca
http://www.escholarship.org/uc/item/7s41c7t5
http://www.escholarship.org/uc/item/7s41c7t5
Autor:
Otoo, Ekow J
Publikováno v:
Otoo, Ekow J. (2008). Optimal Chunking of Large Multidimensional Arrays for Data Warehousing. Lawrence Berkeley National Laboratory. Lawrence Berkeley National Laboratory: Lawrence Berkeley National Laboratory. Retrieved from: http://www.escholarship.org/uc/item/35201092
Very large multidimensional arrays are commonly used in data intensive scientific computations as well as on-line analytical processing applications referred to as MOLAP. The storage organization of such arrays on disks is done by partitioning the la
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od_______325::8dd82d2dec042c687c208c4609f30748
http://www.escholarship.org/uc/item/35201092
http://www.escholarship.org/uc/item/35201092
Autor:
Otoo, Ekow J
Publikováno v:
Otoo, Ekow J. (2008). A File Allocation Strategy for Energy-Efficient Disk Storage Systems. Lawrence Berkeley National Laboratory. Lawrence Berkeley National Laboratory: Lawrence Berkeley National Laboratory. Retrieved from: http://www.escholarship.org/uc/item/18p8g9z0
Exponential data growth is a reality for most enterprise and scientific data centers. Improvements in price/performance and storage densities of disks have made it both easy and affordable to maintain most of the data in large disk storage farms. The
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od_______325::6ab92178110925f741654d969629898c
http://www.escholarship.org/uc/item/18p8g9z0
http://www.escholarship.org/uc/item/18p8g9z0