In this paper, we analyze restrictions of traditional communication performance models affecting the accuracy of analytical prediction of the execution time of collective communication operations on homogeneous and heterogeneous clusters. In particular, we show that the constant and variable contributions of processors and network are not fully separated in these models. Full separation of the ...

We consider the solution of a (generalized) eigenvalue problem arising in physical oceanography that involves the evaluation of both the tangent-linear and adjoint versions of the underlying numerical model. Two different approaches are discussed. First, tangent-linear and adjoint models are generated by the software tool TAF and used separately. Second, the two models are combined into a singl...

The ability of system software to detect and issue error messages that help programmers quickly fix serial and parallel run-time errors is an important productivity criterion for developing and maintaining application programs. Over ten thousand run-time error tests and a run-time error detection (RTED) evaluation tool has been developed for the automatic evaluation of run-time error detection ...

This paper proposes a generic software architecture for the concurrent execution of social simulation models. Concurrent execution of simulation models has considerable advantages regarding other ways of comparing models, such as run-time comparison, performance evaluation, and the possibility of interaction between complementary models. A tool has been implemented and experiments have been car...

The PLL Design Assistant package is provided as a self-extracting executable file for Windows 2000/Xp. Simply download the file setup_pll_design.exe, run it in Windows (i.e., double click on it in Windows Explorer), and then follow the setup instructions. To run the program: Click on the PllDesign icon created during the installation process. The PLL Design Assistant provides a graphical user i...