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

By William J. Dally (auth.)

Concurrent facts buildings simplify the advance of concurrent courses by means of encapsulating well-known mechanisms for synchronization and commu­ nication into information buildings. This thesis develops a notation for describing concurrent facts constructions, offers examples of concurrent info buildings, and describes an structure to aid concurrent information buildings. Concurrent Smalltalk (CST), a spinoff of Smalltalk-80 with extensions for concurrency, is constructed to explain concurrent facts buildings. CST permits the programmer to specify items which are dispensed over the nodes of a concurrent laptop. those allotted items have many constituent gadgets and therefore can strategy many messages at the same time. they're the basis upon which concurrent information 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 accordance with the space houses 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 facts buildings to 0(1) concurrency, the balanced dice achieves 0C.:N) con­ foreign money. contemplating graphs as concurrent facts constructions, 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 higher functionality than current algorithms.

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Additional info for A VLSI Architecture for Concurrent Data Structures

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Neither insensitive actors nor critical regions allow an object to selectively defer some methods while performing others concurrently. Adding locks to objects provides a general mechanism for concurrency control. A lock is part of an object's state. Locks impose a partial order on methods that execute on the object. Each method specifies two possibly empty sets of locks: a set of locks the method requires, and a set of locks the method excludes. A method is not allowed to begin execution until all previous methods executing on the same object that exclude a required lock or require an excluded lock have completed.

Bo, so that ,,-I 1= Eb;2;. 1) The reflected binary code or Gray code representation of I, a bit vector G(I) = g,,-I, ... lo, is generated by taking the modulo-2 sum of adjacent bits of the binary encoding for I [581 . 2. We use the function B(J) to represent the binary number whose Gray code representation is J. 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.

This figure shows a portion of the definition of Class Interval'. The definition has two methods; I:u: is a class method that creates a new interval, and contains: is an instance method that checks if a number is contained in an interval. 4, the contains: method is initiated by sending a message, contains: aNum, to object, anlnterval, of class Interval. Objects of class Interval have two acquaintances 5 , I and u. :::: aNum, and asking u if u ~ aNum. After receiving both replies, anlnterval replies with their logical and.

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