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

By William J. Dally (auth.)

Concurrent info buildings simplify the improvement of concurrent courses by way of encapsulating regularly occurring mechanisms for synchronization and commu­ nication into facts constructions. This thesis develops a notation for describing concurrent facts buildings, provides examples of concurrent info buildings, and describes an structure to help concurrent information buildings. Concurrent Smalltalk (CST), a by-product of Smalltalk-80 with extensions for concurrency, is built to explain concurrent facts constructions. CST permits the programmer to specify gadgets which are dispensed over the nodes of a concurrent laptop. those disbursed items have many constituent items and therefore can approach many messages concurrently. they're the basis upon which concurrent info buildings are equipped. The balanced dice is a concurrent information constitution for ordered units. The set is sent by way 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 keeping 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 info buildings to 0(1) concurrency, the balanced dice achieves 0C.:N) con­ forex. contemplating graphs as concurrent info constructions, graph algorithms are pre­ sented for the shortest direction challenge, the max-flow challenge, and graph parti­ tioning. those algorithms introduce new synchronization ideas to accomplish higher functionality than latest algorithms.

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Extra info for A VLSI Architecture for Concurrent Data Structures

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For example, in the code below, the receiver (self), a constituent of a distributed object, sends a localTally message to the anld th constituent of the same distributed object. (self co: anld) 10ealTally: #foo sum: 0 return From: myld. The argument of the co: message is a constituent identifier. Constituent identifiers are integers assigned to each constituent sequentially beginning with one. The constant myld gives each CO its own index and the constant maxld gives each CO the number of constituents.

It is important to note that although G(2) is a slave node and thus uses the value of the corner node, G(O), the search continues from G(2) and is not detoured to G(O). 3. Node G(3) is also a slave of G(O) and thus less than the search key, so the search is reflected across the V dimension to node G(4) with the message vSearch: 4 wDim: 0 vDim:4. The search key is found at node G(4). 11 illustrates the case in which the search key is not present in the cube. 1-3. The search for the key, 3, is initiated at node G(5).

The lower half subcube is then set with the new key and record. Note that between the assignment of the key and the assignment of the record to the lower half subcube, this subcube is in an inconsistent state. To prevent an inconsistent state from being observed, both localAt: put: and split: key: data: flag: are writer methods. They both require and exclude rwLock. Thus, no other operation can be performed on the current node during an inconsistent state. This locking cannot cause deadlock, since the split node is in fact part of the locked node until the split is completed.

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