Technical Reports

A List by Author: Milan Èe¹ka

e-mail:

xceska(a)fi.muni.cz

Computing Strongly Connected Components in Parallel on CUDA (full version)

by Jiøí Barnat, Petr Bauch, Lubo¹ Brim, Milan Èe¹ka, July 2010, 24 pages.

FIMU-RS-2010-10. Available as Postscript, PDF.

Abstract:

The problem of decomposition of a directed graph into its strongly connected components is a fundamental graph problem inherently present in many scientific and commercial applications. In this paper we show how existing parallel algorithms can be reformulated in order to be accelerated by NVIDIA CUDA technology. In particular, we design a new CUDA-aware procedure for pivot selection and we redesign the parallel algorithms in order to allow for CUDA accelerated computation. We also experimentally demonstrate that with a single GTX 280 GPU card we can easily outperform optimal serial CPU implementation, which is particularly interesting result as unlike the serial CPU case, the asymptotic complexity of the parallel algorithms is not optimal.

CUDA accelerated LTL Model Checking

by Jiøí Barnat, Lubo¹ Brim, Milan Èe¹ka, Tomá¹ Lamr, June 2009, 18 pages.

FIMU-RS-2009-05. Available as Postscript, PDF.

Abstract:

Recent technological developments made available various many-core hardware platforms. For example, a SIMD-like hardware architecture became easily accessible for many users who have their computers equipped with modern NVIDIA GPU cards with CUDA technology. In this paper we redesign the maximal accepting predecessors algorithm [7] for LTL model checking in terms of matrix-vector product in order to accelerate LTL model checking on many-core GPU platforms. Our experiments demonstrate that using the NVIDIA CUDA technology results in a significant computation speedup.

Distributed Qualitative LTL Model Checking of Markov Decision Processes

by Jiøí Barnat, Lubo¹ Brim, Ivana Èerná, Milan Èe¹ka, Jana Tùmová, September 2006, 19 pages.

FIMU-RS-2006-04. Available as Postscript, PDF.

Abstract:

Probabilistic processes are used to model concurrent programs that exhibit uncertainty. The state explosion problem for probabilistic systems is more critical than in the non-probabilistic case. In the paper we propose a cluster-based algorithm for qualitative LTL model checking of finite state Markov decision processes. We use the automata approach which reduces the model checking problem to the question of existence of an accepting end component. The algorithm uses repeated reachability which systematically eliminates states that cannot belong to any accepting end component. A distinguished feature of the distributed algorithm is that its complexity meets the complexity of the best known sequential algorithm.