Hans Moritsch

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Vienna Fortran is a machine-independent language extension of Fortran, which is based upon the Single-Program-Multiple-Data (SPMD) paradigm and allows the user to write programs for distributed-memory systems using global addresses. The language features focus mainly on the issue of distributing data across virtual processor structures. In this paper, we(More)
In this paper we introduce a multi-objective auto-tuning framework comprising compiler and runtime components. Focusing on individual code regions, our compiler uses a novel search technique to compute a set of optimal solutions, which are encoded into a multi-versioned executable. This enables the runtime system to choose specifically tuned code versions(More)
Over the last decade, a dramatic increase has been observed in the need for generating and organising data in the course of large parameter studies, performance analysis , and software testings. We have developed the ZENTU-RIO experiment management tool for performance and parameter studies on cluster and Grid architectures. In this paper we describe our(More)
In this paper we give an overview of SCALEA, which is a new performance analysis tool for OpenMP, MPI, HPF, and mixed parallel/distributed programs. SCALEA instruments, executes and measures programs and computes a variety of performance overheads based on a novel overhead classification. Source code and HW-profiling is combined in a single system which(More)
Manually tuning MPI runtime parameters is a practice commonly employed to optimise MPI application performance on a specific architecture. However, the best setting for these parameters not only depends on the underlying system but also on the application itself and its input data. This paper introduces a novel approach based on machine learning techniques(More)
The Aurora nancial management system developed at the University of Vienna is a modular decision support tool for portfolio and asset-liability management. It is based on a multivariate Markovian birth-and-death factor model for the economic environment, a pricing model for the nancial instruments and an objective function which is exible enough to express(More)
MPI implementations provide several hundred runtime parameters that can be tuned for performance improvement. The ideal parameter setting does not only depend on the target multiprocessor architecture but also on the application, its problem and communicator size. This paper presents <b>ATune</b>, an automatic performance tuning tool that uses machine(More)