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Статті в журналах з теми "Deterministic constant time algorithms"
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Jayanti, Prasad, and Siddhartha Jayanti. "Deterministic Constant-Amortized-RMR Abortable Mutex for CC and DSM." ACM Transactions on Parallel Computing 8, no. 4 (2021): 1–26. http://dx.doi.org/10.1145/3490559.
Повний текст джерелаАнотація:
The abortable mutual exclusion problem, proposed by Scott and Scherer in response to the needs in real-time systems and databases, is a variant of mutual exclusion that allows processes to abort from their attempt to acquire the lock. Worst-case constant remote memory reference algorithms for mutual exclusion using hardware instructions such as Fetch&Add or Fetch&Store have long existed for both cache coherent (CC) and distributed shared memory multiprocessors, but no such algorithms are known for abortable mutual exclusion. Even relaxing the worst-case requirement to amortized, algorithms are only known for the CC model. In this article, we improve this state of the art by designing a deterministic algorithm that uses Fetch&Store to achieve amortized O (1) remote memory reference in both the CC and distributed shared memory models. Our algorithm supports Fast Abort (a process aborts within six steps of receiving the abort signal) and has the following additional desirable properties: it supports an arbitrary number of processes of arbitrary names, requires only O (1) space per process, and satisfies a novel fairness condition that we call Airline FCFS . Our algorithm is short with fewer than a dozen lines of code.
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SUEL, TORSTEN. "PERMUTATION ROUTING AND SORTING ON MESHES WITH ROW AND COLUMN BUSES." Parallel Processing Letters 05, no. 01 (1995): 63–80. http://dx.doi.org/10.1142/s0129626495000072.
Повний текст джерелаАнотація:
We study the problems of permutation routing and sorting on several models of meshes with fixed and reconfigurable row and column buses. We describe two fast and fairly simple deterministic algorithms for permutation routing on two-dimensional networks, and a more complicated algorithm for multi-dimensional networks. The algorithms are obtained by converting two known off-line routing schemes into deterministic routing algorithms, and they can be implemented on a variety of different models of meshes with buses. We also give a deterministic algorithm for 1–1 sorting whose running time matches that for permutation routing, and another algorithm that matches the bisection lower bound on reconfigurable networks of arbitrary constant dimension.
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DAS, SAJAL K., and RANETTE H. HALVERSON. "SIMPLE DETERMINISTIC AND RANDOMIZED ALGORITHMS FOR LINKED LIST RANKING ON THE EREW PRAM MODEL." Parallel Processing Letters 04, no. 01n02 (1994): 15–27. http://dx.doi.org/10.1142/s012962649400003x.
Повний текст джерелаАнотація:
An asynchronous, CRCW PRAM (or APRAM) algorithm for linked list ranking, proposed by Martel and Subramonian, performs EO (n log log n) expected work employing [Formula: see text] processors. Motivated by their unique approach, this paper proposes two EREW list ranking algorithms – one deterministic and the other randomized. The deterministic algorithm performs in [Formula: see text] time using p processors, where n≥p log p. Thus, for p= O (n/ log n), it requires O ( log n log log n) time and O (n log log n) work. Although not work-optimal, this algorithm is very simple compared to the known work-optimal (deterministic) EREW algorithms for list ranking and has the added advantage of small constant factors in the time and space requirements. The randomized algorithm follows the same line of approach, but uses randomization in one step to decrease the time complexity, thus improving on the time complexity of the original algorithm. It requires [Formula: see text] expected time, and hence it is an EO ( log n) expected time, work-optimal algorithm employing p= O (n/ log n) processors. Furthermore, the randomized algorithm uses less space than the deterministic algorithm.
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Khadiev, Kamil, and Vladislav Remidovskii. "Classical and Quantum Algorithms for Assembling a Text from a Dictionary." Nonlinear Phenomena in Complex Systems 24, no. 3 (2021): 207–21. http://dx.doi.org/10.33581/1561-4085-2021-24-3-207-221.
Повний текст джерелаАнотація:
We study algorithms for solving the problem of assembling a text (long string) from a dictionary (a sequence of small strings). The problem has an application in bioinformatics and has a connection with the sequence assembly method for reconstructing a long deoxyribonucleic-acid (DNA) sequence from small fragments. The problem is assembling a string t of length n from strings s1,...,sm. Firstly, we provide a classical (randomized) algorithm with running time Õ(nL0.5 + L) where L is the sum of lengths of s1,...,sm. Secondly, we provide a quantum algorithm with running time Õ(nL0.25 + √mL). Thirdly, we show the lower bound for a classical (randomized or deterministic) algorithm that is Ω(n+L). So, we obtain the quadratic quantum speed-up with respect to the parameter L; and our quantum algorithm have smaller running time comparing to any classical (randomized or deterministic) algorithm in the case of non-constant length of strings in the dictionary.
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Allender, Eric, V. Arvind, Rahul Santhanam, and Fengming Wang. "Uniform derandomization from pathetic lower bounds." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 370, no. 1971 (2012): 3512–35. http://dx.doi.org/10.1098/rsta.2011.0318.
Повний текст джерелаАнотація:
The notion of probabilistic computation dates back at least to Turing, who also wrestled with the practical problems of how to implement probabilistic algorithms on machines with, at best, very limited access to randomness. A more recent line of research, known as derandomization, studies the extent to which randomness is superfluous. A recurring theme in the literature on derandomization is that probabilistic algorithms can be simulated quickly by deterministic algorithms, if one can obtain impressive (i.e. superpolynomial, or even nearly exponential) circuit size lower bounds for certain problems. In contrast to what is needed for derandomization, existing lower bounds seem rather pathetic. Here, we present two instances where ‘pathetic’ lower bounds of the form n 1+ ϵ would suffice to derandomize interesting classes of probabilistic algorithms. We show the following: — If the word problem over S 5 requires constant-depth threshold circuits of size n 1+ ϵ for some ϵ >0, then any language accepted by uniform polynomial size probabilistic threshold circuits can be solved in subexponential time (and, more strongly, can be accepted by a uniform family of deterministic constant-depth threshold circuits of subexponential size). — If there are no constant-depth arithmetic circuits of size n 1+ ϵ for the problem of multiplying a sequence of n 3×3 matrices, then, for every constant d , black-box identity testing for depth- d arithmetic circuits with bounded individual degree can be performed in subexponential time (and even by a uniform family of deterministic constant-depth AC 0 circuits of subexponential size).
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Rajasekaran, Sanguthevar. "On the Euclidean Minimum Spanning Tree Problem." Computing Letters 1, no. 1 (2005): 11–14. http://dx.doi.org/10.1163/1574040053326325.
Повний текст джерелаАнотація:
Given a weighted graph G(V;E), a minimum spanning tree for G can be obtained in linear time using a randomized algorithm or nearly linear time using a deterministic algorithm. Given n points in the plane, we can construct a graph with these points as nodes and an edge between every pair of nodes. The weight on any edge is the Euclidean distance between the two points. Finding a minimum spanning tree for this graph is known as the Euclidean minimum spanning tree problem (EMSTP). The minimum spanning tree algorithms alluded to before will run in time O(n2) (or nearly O(n2)) on this graph. In this note we point out that it is possible to devise simple algorithms for EMSTP in k- dimensions (for any constant k) whose expected run time is O(n), under the assumption that the points are uniformly distributed in the space of interest.CR Categories: F2.2 Nonnumerical Algorithms and Problems; G.3 Probabilistic Algorithms
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Efthymiou, Charilaos. "Deterministic counting of graph colourings using sequences of subgraphs." Combinatorics, Probability and Computing 29, no. 4 (2020): 555–86. http://dx.doi.org/10.1017/s0963548320000255.
Повний текст джерелаАнотація:
AbstractIn this paper we propose a polynomial-time deterministic algorithm for approximately counting the k-colourings of the random graph G(n, d/n), for constant d>0. In particular, our algorithm computes in polynomial time a $(1\pm n^{-\Omega(1)})$ -approximation of the so-called ‘free energy’ of the k-colourings of G(n, d/n), for $k\geq (1+\varepsilon) d$ with probability $1-o(1)$ over the graph instances.Our algorithm uses spatial correlation decay to compute numerically estimates of marginals of the Gibbs distribution. Spatial correlation decay has been used in different counting schemes for deterministic counting. So far algorithms have exploited a certain kind of set-to-point correlation decay, e.g. the so-called Gibbs uniqueness. Here we deviate from this setting and exploit a point-to-point correlation decay. The spatial mixing requirement is that for a pair of vertices the correlation between their corresponding configurations becomes weaker with their distance.Furthermore, our approach generalizes in that it allows us to compute the Gibbs marginals for small sets of nearby vertices. Also, we establish a connection between the fluctuations of the number of colourings of G(n, d/n) and the fluctuations of the number of short cycles and edges in the graph.
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Tarnawski, Jakub. "New graph algorithms via polyhedral techniques." it - Information Technology 63, no. 3 (2021): 177–82. http://dx.doi.org/10.1515/itit-2021-0014.
Повний текст джерелаАнотація:
Abstract This article gives a short overview of my dissertation, where new algorithms are given for two fundamental graph problems. We develop novel ways of using linear programming formulations, even exponential-sized ones, to extract structure from problem instances and to guide algorithms in making progress. The first part of the dissertation addresses a benchmark problem in combinatorial optimization: the asymmetric traveling salesman problem (ATSP). It consists in finding the shortest tour that visits all vertices of a given edge-weighted directed graph. A ρ-approximation algorithm for ATSP is one that runs in polynomial time and always produces a tour at most ρ times longer than the shortest tour. Finding such an algorithm with constant ρ had been a long-standing open problem. Here we give such an algorithm. The second part of the dissertation addresses the perfect matching problem. We have known since the 1980s that it has efficient parallel algorithms if the use of randomness is allowed. However, we do not know if randomness is necessary – that is, whether the matching problem is in the class NC. We show that it is in the class quasi-NC. That is, we give a deterministic parallel algorithm that runs in poly-logarithmic time on quasi-polynomially many processors.
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Hu, Xiao-Bing, Ming Wang, Mark S. Leeson, Ezequiel A. Di Paolo, and Hao Liu. "Deterministic Agent-Based Path Optimization by Mimicking the Spreading of Ripples." Evolutionary Computation 24, no. 2 (2016): 319–46. http://dx.doi.org/10.1162/evco_a_00156.
Повний текст джерелаАнотація:
Inspirations from nature have contributed fundamentally to the development of evolutionary computation. Learning from the natural ripple-spreading phenomenon, this article proposes a novel ripple-spreading algorithm (RSA) for the path optimization problem (POP). In nature, a ripple spreads at a constant speed in all directions, and the node closest to the source is the first to be reached. This very simple principle forms the foundation of the proposed RSA. In contrast to most deterministic top-down centralized path optimization methods, such as Dijkstra’s algorithm, the RSA is a bottom-up decentralized agent-based simulation model. Moreover, it is distinguished from other agent-based algorithms, such as genetic algorithms and ant colony optimization, by being a deterministic method that can always guarantee the global optimal solution with very good scalability. Here, the RSA is specifically applied to four different POPs. The comparative simulation results illustrate the advantages of the RSA in terms of effectiveness and efficiency. Thanks to the agent-based and deterministic features, the RSA opens new opportunities to attack some problems, such as calculating the exact complete Pareto front in multiobjective optimization and determining the kth shortest project time in project management, which are very difficult, if not impossible, for existing methods to resolve. The ripple-spreading optimization principle and the new distinguishing features and capacities of the RSA enrich the theoretical foundations of evolutionary computation.
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Mehta, Dinesh P., Carl Shetters, and Donald W. Bouldin. "Meta-Algorithms for Scheduling a Chain of Coarse-Grained Tasks on an Array of Reconfigurable FPGAs." VLSI Design 2013 (December 25, 2013): 1–13. http://dx.doi.org/10.1155/2013/249592.
Повний текст джерелаАнотація:
This paper considers the problem of scheduling a chain of n coarse-grained tasks on a linear array of k reconfigurable FPGAs with the objective of primarily minimizing reconfiguration time. A high-level meta-algorithm along with two detailed meta-algorithms (GPRM and SPRM) that support a wide range of problem formulations and cost functions is presented. GPRM, the more general of the two schemes, reduces the problem to computing a shortest path in a DAG; SPRM, the less general scheme, employs dynamic programming. Both meta algorithms are linear in n and compute optimal solutions. GPRM can be exponential in k but is nevertheless practical because k is typically a small constant. The deterministic quality of this meta algorithm and the guarantee of optimal solutions for all of the formulations discussed make this approach a powerful alternative to other metatechniques such as simulated annealing and genetic algorithms.