PVM (Parallel Virtual Machine) is currently a defacto standard in the world of distributed computing based on message passing [10]. PVMe is a proprietary realization of the PVM programming model which maintains the fu...
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PVM (Parallel Virtual Machine) is currently a defacto standard in the world of distributed computing based on message passing [10]. PVMe is a proprietary realization of the PVM programming model which maintains the full compliance with the original programming interface, but it is specially tuned to obtain higher performances on the SP2, the ibm parallel system based on the POWER 2 architecture and the AIX operating system. During the design and the development of PVMe we had a unique chance to gain clear indications about the aspects of the run-time system support more critical to achieve good results running applications by means of PVM. Hereafter we report about our experience and the (hopefully) useful lesson we learnt.
We present PVMe, ibm's AIX implementation of the widely used PVM message passing programming model. The focus is on the version for the ibm 9076 SP2. The basic PVMe design is described along with the results obtai...
ISBN:
(纸本)3540593934
We present PVMe, ibm's AIX implementation of the widely used PVM message passing programming model. The focus is on the version for the ibm 9076 SP2. The basic PVMe design is described along with the results obtained running some significant applications on the platform. A perspective on possible future developments of PVMe concludes the work.
作者：
BRISCOLINI, MIBM ECSEC
European Center for Scientific and Engineering Computing P.le Giulio Pastore 6 00144 Roma Italy
The paper reports on two parallel message passing implementations of a 3-D pseudospectral based code on top of the PVMe [1] and the MPL Parallel Environment [2], both parallel interfaces tuned for the ibm's scalab...
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The paper reports on two parallel message passing implementations of a 3-D pseudospectral based code on top of the PVMe [1] and the MPL Parallel Environment [2], both parallel interfaces tuned for the ibm's scalable parallel system. Specifically, the discussion underlines details of high performing real-to-complex and complex-to-real parallel 3-D FFTs, the two computational kernels in the 3-D pseudospectral integration method, on the base of parallel performances measured on an SP1 16 nodes and on two SP2 16 thin and 16 wide nodes. At the end, some considerations about computational capabilities of the ibm's parallel distributed memory architecture in performing high intensive numerical simulations of 3-D homogeneous turbulent flows are also addressed.
A low-resolution (64(3)) large-eddy model of forced homogeneous turbulence is numerically simulated using Kraichnan's eddy viscosity. The introduction of a reliable statistical estimate of the zeta(p) exponents al...
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A low-resolution (64(3)) large-eddy model of forced homogeneous turbulence is numerically simulated using Kraichnan's eddy viscosity. The introduction of a reliable statistical estimate of the zeta(p) exponents allows one to perform a detailed statistical analysis of the velocity field and shows that the probability distribution functions, the structure functions and the power-law exponents zeta(p) agree with previous numerical and experimental results obtained at much higher effective resolution. This result shows how a simple modelling of the energy transfer produces self-similar dynamics extending to the small scales and obtains the right statistical properties of the velocity field.
We present some experiences and results on parallel linear algebra algorithms on distributed memory platforms, based on the ibm RISC System/6000 workstations;we shall refer both to homogeneous workstation clusters and...
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We report on the existence of a hitherto undetected form of self-similarity, which we call extended self-similarity (ESS). ESS holds at high as well as at low Reynolds number, and it is characterized by the same scali...
We report on the existence of a hitherto undetected form of self-similarity, which we call extended self-similarity (ESS). ESS holds at high as well as at low Reynolds number, and it is characterized by the same scaling exponents of the velocity differences of fully developed turbulence.
The interaction energy of acetamidoxime in its two tautomeric forms (the amino-oxime and the imino-hydroxylamino forms) with the H+ and Li+ cations was evaluated with self-consistent-field molecular-orbital (SCF MO) c...
One of the most challenging problems in fluid dynamics is understanding the properties of turbulent flows. The advent of large supercomputers permits the investigation of turbulence with great accuracy in two dimensio...
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One of the most challenging problems in fluid dynamics is understanding the properties of turbulent flows. The advent of large supercomputers permits the investigation of turbulence with great accuracy in two dimensions, but full three-dimensional problems are physically more complex and their study is currently limited to the case of simple flows. It is shown that the availability of a continuous time-dependent representation of the dynamics of fluid flows can quickly lead to more complete understanding of the many concurrent physical mechanisms ruling turbulence. Some significant examples show how an analog videotape, obtained from direct computer simulations of fluid flows, suggests physical results that can later be obtained through a mathematical analysis of the numerical simulations.
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