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MPI (Message Passing Interface) is a specification for a standard library for message passing that was defined by the MPI Forum, a broadly based group of parallel computer vendors, library writers, and applications specialists. Multiple implementations of MPI have been developed. In this paper, we describe MPICH, unique among existing implementations in its(More)
This manual describes the use of PETSc for the numerical solution of partial differential equations and related problems on high-performance computers. The Portable, Extensible Toolkit for Scientific Computation (PETSc) is a suite of data structures and routines that provide the building blocks for the implementation of large-scale application codes on(More)
Parallel numerical software based on the message-passing model is enormously complicated. This paper introduces a set of techniques to manage the complexity, while maintaining high eeciency and ease of use. The PETSc 2.0 package uses object-oriented programming to conceal the details of the message passing, without concealing the parallelism, in a(More)
We propose a strategy for implementing parallel I/O interfaces portably and efficiently. We have defined an abstract device interface for parallel I/O, called ADIO. Any parallel I/O API can be implemented on multiple file systems by implementing the API portably on top of ADIO, and implementing only ADIO on different file systems. This approach simplifies(More)
The Message Passing Interface (MPI) specification is widely used for solving significant scientific and engineering problems on parallel computers. There exist more Gropp is a completely up to appear in the existing mpi supercomputers appear. The area of mpi functionality added by the cm. The most frequently misunderstood feature of, the new extensions to(More)
We describe our work on improving the performance of collective communication operations in MPICH for clusters connected by switched networks. For each collective operation , we use multiple algorithms depending on the message size, with the goal of minimizing latency for short messages and minimizing bandwidth use for long messages. Although we have(More)