A VLSI Architecture for Concurrent Data Structures - download pdf or read online

By William J. Dally (auth.)

ISBN-10: 1461291917

ISBN-13: 9781461291916

ISBN-10: 1461319951

ISBN-13: 9781461319955

Concurrent info constructions simplify the improvement of concurrent courses by way of encapsulating everyday mechanisms for synchronization and commu­ nication into info constructions. This thesis develops a notation for describing concurrent info buildings, offers examples of concurrent facts constructions, and describes an structure to help concurrent facts buildings. Concurrent Smalltalk (CST), a spinoff of Smalltalk-80 with extensions for concurrency, is built to explain concurrent information buildings. CST permits the programmer to specify gadgets which are dispensed over the nodes of a concurrent computing device. those disbursed gadgets have many constituent items and hence can technique many messages concurrently. they're the root upon which concurrent information buildings are equipped. The balanced dice is a concurrent facts constitution for ordered units. The set is sent by means of 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 accordance with the space houses of the grey code, searches a balanced dice in O(log N) time. since it doesn't have the basis bottleneck that limits all tree-based information buildings to 0(1) concurrency, the balanced dice achieves 0C.:N) con­ forex. contemplating graphs as concurrent information constructions, graph algorithms are pre­ sented for the shortest direction challenge, the max-flow challenge, and graph parti­ tioning. those algorithms introduce new synchronization thoughts to accomplish larger functionality than current algorithms.

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In many applications these objects are records and the linear order is defined by the value of a key field in each record. In this context the ordered set is used to store a database of relations associating the key field with the other fields of the record. The order relation defined on the keys of the records is implicit in the structure. A data structure implementing the ordered set must efficiently support the following operations. at: key return the object associated with a key. at: key put: object delete: key add an object to the set remove the object associated with key from the set.

Methods are constructed from a set of primitive actions by sequencing the actions with messages. Often a method will send a message to an object and wait for a reply before proceeding with the computation. For example, in the code fragment below, the message size is sent to object x, and the method must wait for the reply before continuing. xSize +-x size. ySize +-xSize * 2. Since there is no receive statement, multiple actions are required to implement this method. The first action creates a context and sends the size message.

Thus there is no point in sending a message to the W neighbor, and the search is completed. Before terminating the search, however, X checks the contents of its linear neighbor in the direction of the key to verify that the key hasn't been inserted in the cube during the search. If the key isn't found, the search terminates with a nil reply. Otherwise, the search continues by increasing the W dimension above the dimension of X's subcube. 8. The wSearch method makes the current node one endpoint of the new search space, selecting between N w and Ny as the other endpoint.

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A VLSI Architecture for Concurrent Data Structures by William J. Dally (auth.)


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