MPI-IO, the I/O part of the MPI-2 standard, is a portable API for high-performance parallel I/O. It is speci cally designed to overcome the performance and portability limitations of the Unix-like APIs currently supported by most parallel le systems. We discuss the main features of MPI-IO and describe our MPI-IO implementation, ROMIO, which runs on most machines and le systems, including Linux ...

Adaptive MPI is an implementation of the Message Passing Interface (MPI) standard. AMPI benefits MPI programs with features such as dynamic load balancing, virtualization, and checkpointing. AMPI runs each MPI process in a user-level thread, therefore causing problems when an MPI program has global variables. Manually removing the global variables in the program is tedious and error-prone. In t...

Coronary artery disease (CAD) is the leading cause of death in the world. Myocardial perfusion imaging (MPI) plays a significant role in non-invasive diagnosis and prognosis of CAD. However, neither single-photon emission computed tomography nor positron emission tomography clinical MPI agents can absolutely satisfy the demands of clinical practice. In the past decades, tremendous developments ...

OBJECTIVE Investigations of Appropriate Use Criteria (AUC) education have shown a mixed effect on changing provider behaviour. At our facility, rarely appropriate myocardial perfusion imaging (MPI) differs by specialty; awareness of AUC is low. Our objective is to investigate if specialty-specific, multimodality education could reduce rarely appropriate MPI. METHODS We designed education focu...

Myocardial perfusion imaging (MPI) is commonly used to detect ischemia. Concerns about silent ischemia may encourage orders for MPI in asymptomatic patients. Factors contributing to this practice are poorly described and the clinical utility is questionable.We conducted a single center retrospective cohort investigation on Veterans who underwent MPI between December 2010 and July 2011. We gathe...

MapReduce is an emerging programming paradigm for dataparallel applications. We discuss common strategies to implement a MapReduce runtime and propose an optimized implementation on top of MPI. Our implementation combines redistribution and reduce and moves them into the network. This approach especially benefits applications with a limited number of output keys in the map phase. We also show h...

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 basic mpi. Saltz proceedings of work pr...

Various implementations of MPI are becoming available as MPI is slowly emerging as the standard API for parallel programming on most platforms. The open source implementations LAM-MPI and MPICH are the most widely used, while commercial implementations are usually tied to special hardware platforms. This paper compares these two open-source MPIimplementations to one of the commercially availabl...

During our research in the simulation of message-passing applications on parallel, high-performance systems, we have discovered that the native MPI implementation on the IBM SP suffers from performance anomalies. Our simulator, MPI-Sim, predicted a smooth performance for an ASCI relevant application, whereas the measured system showed a sudden jump in the runtime of the application. Surprisingl...

This document describes the MPI for Python package. MPI for Python provides bindings of the Message Passing Interface (MPI) standard for the Python programming language, allowing any Python program to exploit multiple processors. This package is constructed on top of the MPI-1/2/3 specifications and provides an object oriented interface which resembles the MPI-2 C++ bindings. It supports point-...