Extents of an array

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Topic: Extents of an array

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	hpf.ppt
		By default VP set has minimal shape s.t.: VP grid is large enough to hold the array, Extents of VP grid are powers of 2, Total number VPs is a multiple of number PEs.
		Included all the new array syntax of Fortran 90.
		In practise, their Connection Machine series was used largely for scientific computing.
	www.hpjava.org /talks/beijing/hpf/hpf.ppt

	Algorithms and Data Structures: Templateads::MultiArray< N, T > class Reference
		Construct a 2-D multi-array from the index extents.
		Convert a single index to indices in a 3-D array.
		Convert a single index to indices in a 2-D array.
	www.acm.caltech.edu /~seanm/projects/ads/html/classads_1_1MultiArray.html

	Class ninja.sds.Extent
		An array of the extents, null if their is a formatting error.
		The string should be formatted by having a list of extents, each separated by either a comma or a space.
		A utility function for parsing a list of extents.
	ninja.cs.berkeley.edu /javadocs/ninja.sds.Extent.html

	The Java Community Process(SM) Program - JSRs: Java Specification Requests - detail JSR# 83
		A multiarray is characterized by its rank (number of dimensions or axes), its elemental data type (all elements of a multiarray are of the same type), and its shape (the extents along its axes).
		Get and set the values of the elements in an irregular multiarray section.
		Get and set the values of a multiarray element or regular multiarray section.
	jcp.org /jsr/detail/83.jsp

	[3.1] Extent-based versus log-structured file systems
		The approach used under QNX, for example, is to have files exist as an array of extents on disk, where each is extent is as many contiguous blocks as could be allocated at that location.
		This approach allows the unit of disk space allocation to remain 512 bytes, which is also the smallest unit of physical I/O. The potential performance bottleneck of this approach does not happen because the filesystem code passes I/O requests to the disk drivers in units of extents, not 512 byte blocks.
		The filesystem also heuristically modifies the size of the pre-read requests based on the historical access pattern to the file.
	www.faqs.org /faqs/os-research/part1/section-12.html (262 words)

	Beam Width Analysis
		An " approximate" beam divergence for the phased array probe in the lateral direction is indicated using a " natural focus" of 2.7mm at 70mm along the beam axis.
		For a phased array probe we need to treat the phasing part of the focal plane similarly to a shaped element and the un-phased lateral plane as a flat rectangular element.
		Although it would have been a simple matter to compare the lateral beam extents by measuring the probe displacement on a calibration block with the standard 2mm diameter flat bottom hole, this too was not done prior to making the statement at the conference.
	www.ndt.net /article/v06n09/ginzel/ginzel.htm (1848 words)

	DBAsupport.com Forums - Amount of segments per tablespace
		Anyway, thanks for the confirmation that the number of segments of per tablespace should not be a concern.
		I've had a look at how many segments each tablespace will contain after the re-org, and some of the SMALL tablespaces will have over 6000 segments (a lot of these will have no data).
		I know there is an an argument for limiting the number of segments per tablespace so it is easier to balance IO, but I don't think this applies in my case.
	www.dbasupport.com /forums/archive/index.php/t-40795.html (956 words)

	Imaging the Surfaces of Stars
		By the time the Square Kilometer Array is constructed, a number of powerful optical and IR interferometers (OIRI) will also be in operation.
		Thus, study of the properties and dynamics of the stellar atmosphere leading to a better understanding of the mechanisms responsible for their large extents and mass outflows is one of the important topics in red giant and supergiant star research.
		The situation is less clear for red supergiant stars as dust is not expected to form in a hot chromosphere, but the mechanisms involved presumably also operate in the lower regions of the extended stellar atmosphere.
	www.ras.ucalgary.ca /SKA/science/node14.html (2290 words)

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Topic: Extents of an array

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In the News (Tue 2 Dec 08)