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Solving SAT in a distributed cloud: A portfolio approach

Ngoko Yanik, Cérin Christophe, Trystram Denis

International Journal of Applied Mathematics and Computer Science

2019

Vol. 29, no. 2

261--274

We introduce a new parallel and distributed algorithm for the solution of the satisfiability problem. It is based on an algorithm portfolio and is intended to be used for servicing requests in a distributed cloud. The core of our contribution is the modeling of the optimal resource sharing schedule in parallel executions and the proposition of heuristics for its approximation. For this purpose, we reformulate a computational problem introduced in a prior work. The main assumption is that it is possible to learn optimal resource sharing from traces collected on past executions on a representative set of instances. We show that the learning can be formalized as a set coverage problem. Then we propose to solve it by approximation and dynamic programming algorithms based on classical greedy algorithms for the maximum coverage problem. Finally, we conduct an experimental evaluation for comparing the performance of the various algorithms proposed. The results show that some algorithms become more competitive if we intend to determine the trade-off between their quality and the runtime required for their computation.

Complementary oriented allocation algorithm for cloud computing

Orzechowski P.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

2017

Vol. 21, No 4

395--403

Nowadays cloud computing is one of the most popular processing models. More and more different kinds of workloads have been migrated to clouds. This trend obliges the community to design algorithms which could optimize the usage of cloud resources and be more efficient and effective. The paper proposes a new model of workload allocation which bases on the complementarity relation and analyzes it. An example of a case of use is shown and an increase in the workload execution is presented.

Współtworzenie wartości z klientami zorientowane na innych klientów

Doligalski T.

Nowoczesne Systemy Zarządzania

2009

T. 4, nr 1

253--265

Co-creating values performed by customer and oriented at other customers is an interesting managerial concept. Its essence is based on the promise, that some customers are beneficiaries of other customers actions. The application possibilities of this concept are huge, however development of news skills and assets may be needed. In the paper various approaches to co-creating values are presented and a categorization of this phenomena is proposed.