By William J. Dally (auth.)
Concurrent information buildings simplify the improvement of concurrent courses by means of encapsulating time-honored mechanisms for synchronization and commu nication into information buildings. This thesis develops a notation for describing concurrent information buildings, offers examples of concurrent info constructions, and describes an structure to aid concurrent information buildings. Concurrent Smalltalk (CST), a by-product of Smalltalk-80 with extensions for concurrency, is built to explain concurrent info constructions. CST permits the programmer to specify gadgets which are allotted over the nodes of a concurrent machine. those disbursed items have many constituent gadgets and therefore can technique many messages at the same time. they're the root upon which concurrent info buildings are outfitted. The balanced dice is a concurrent facts constitution for ordered units. The set is sent via a balanced recursive partition that maps to the subcubes of a binary 7lrcube utilizing a grey code. A seek set of rules, VW seek, in response to the gap homes of the grey code, searches a balanced dice in O(log N) time. since it doesn't have the foundation bottleneck that limits all tree-based info buildings to 0(1) concurrency, the balanced dice achieves 0C.:N) con forex. contemplating graphs as concurrent information buildings, graph algorithms are pre sented for the shortest direction challenge, the max-flow challenge, and graph parti tioning. those algorithms introduce new synchronization innovations to accomplish larger functionality than current algorithms.
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Extra info for A VLSI Architecture for Concurrent Data Structures
3 into itself we can express bi as a modulo-2 summation of the bits of G(I). 4) j=i While these equations serve as a useful recipe for converting between binary and Gray codes, we gain more insight into the structure of the code by considering a recursive list definition of the Gray code. For any integer, n, we can construct a list of N = 2" integers, gray(n), so that the Ith element of gray(n) is an integer whose binary encoding is identical to the Gray encoding of I. The construction begins with the Gray code of length 1.
The algorithms and data structures developed in this thesis are based on a message-passing model of concurrent computation. Message-passing concurrent computers are communication limited. The time required to pass messages dominates the processing time, which we will ignore. 24 A VLSI Architecture for Concurrent Data Structures In sharp contrast, most existing concurrent algorithms have been developed assuming an ideal shared-memory multiprocessor. In the shared-memory model, communication cost is ignored.
Some applications require global communication combined with a simple computation. For example, branch and bound search problems require that the minimum bound be broadcast to all processors. Ideally, a communication network would accept a bound from each processor, compute the minimum, and broadcast it. In fact, the computation can be carried out in a distributed manner on the wire-or lines provided by the Cosmic Cube. Distributed objects provide a convenient and machine-independent means of describing a broad class of global communication services.
A VLSI Architecture for Concurrent Data Structures by William J. Dally (auth.)