of an OpenMP subset on a NOW, and compare them with hand-coded software DSM and MPI results for the same applications on the same platform. We use ve applications (ASCI Sweep3d, NAS 3D-FFT, SPLASH-2 Water, QSORT, and TSP) exhibiting various styles of parallelization, including pipelined execution, data

We discuss the issues involved in implementing MPI-IO portably on multiple machines and file systems and also achieving high performance. One way to implement MPI-IO portably is to implement it on top of the basic Unix I/O functions (open, lseek, read, write, and close), which are themselves

will be discussed and performance will be compared with the MPI implementation. We have demonstrated that OpenMP can achieve very good results for parallelization on a shared memory system, but effective use of memory and cache is very important.

that provide the building blocks for the implemen-tation of large-scale application codes on parallel (and serial) computers. PETSc uses the MPI standard for all message-passing communication. PETSc includes an expanding suite of parallel linear, nonlinear equation solvers and time integrators that may be used

In this paper we describe the steps involved, the effort required and the performance achieved in both MPI and OpenMP implementations of a Fortran 90 finite element analysis code on an SGI Origin2000 using the MIPSpro compiler. We demonstrate that a working OpenMP version is easier to write

We describe the effort and experience in generating a hybrid parallel version of MFIX (Multiphase Flow with Interphase eXchanges), a code for modeling reactive multiphase flow in fluidized beds. The code uses portable OpenMP and MPI in a unified source code. The resulting parallel code has been

only to ease porting MPI codes to OpenMP. 1. Introduction and

Abstract. This paper presents a tool setup for comprehensive eventbased performance analysis of large-scale openmp and hybrid openmp/ mpi applications. The kojak framework is used for portable code instrumentation and automatic analysis while the new Vampir NG infrastructure serves as generic

The hybrid memory model of clusters of multiprocessors raises two issues: programming model and performance. Many parallel programs have been written by using the MPI standard. To evaluate the pertinence of hybrid models for existing MPI codes, we compare a unified model (MPI) and a hybrid one

MPI-OpenMP); the second uses only OpenMP (version called OpenMP-Only). MGPOM is a multiblock grid code that enables the exploitation of two levels of parallelism.