In this paper, we present a performance modeling framework based on memory bandwidth contention time and a parameterized communication model to predict the performance of OpenMP, MPI and hybrid applications with weak scaling on three large-scale multicore supercomputers: IBM POWER4, POWER5+ and BlueGene/P, and analyze the performance of these MPI, OpenMP and hybrid applications. We use STREAM m...

We present new versions of the previously published C and CUDA programs for solving the dipolar Gross-Pitaevskii equation in one, two, and three spatial dimensions, which calculate stationary and non-stationary solutions by propagation in imaginary or real time. Presented programs are improved and parallelized versions of previous programs, divided into three packages according to the type of p...

This paper outlines the design of ATS (the APART Test Suite) for evaluating (automatic) performance analysis tools with respect to their effectiveness in detecting actual performance problems, with focus on the ATS test programs related to OpenMP. It reports on results from applying two OpenMP performance analysis tools to the test cases generated from ATS.

Heterogeneous supercomputers are widespread over HPC systems and programming efficient applications on these architectures is a challenge. Task-based models promising way to tackle this Since OpenMP 4.0 4.5, the target directives enable offload pieces of code GPUs express it as tasks with dependencies. Therefore, heterogeneous machines can be programmed using MPI+OpenMP(task+target) exhibit ver...

DEFINITION OpenMP is an application programming interface for parallelizing sequential programs written in C, C++, and Fortran on shared-memory platforms. It provides a collection of compiler directives, a runtime library, and environment variables to enable programmers to specify the parallelism they desire to exploit in a program.

OpenMP is emerging as a quasi-standard for shared memory parallel programming on small SMP-systems. To serve as a common programming interface in shared memory parallel programming, scalability to a larger number of nodes and support for different shared memory architectures has to be proven. In this paper we investigate how well the basic constructs of OpenMP are implemented on different paral...