CAUTION: This page is still under construction !!


The Computational Toolkit
Toolkit Components:
Finite-Difference Code "Skeletonizer"
Support for Parallel Adaptive Finite-Difference Methods
DAGH: A Data-Management Infrastructure for Parallel Adaptive Techniques
User's Guide
Draft Report
Distribution (Version 0.1)
DAGH Wish List
DAGH Specification Requirements and Applications
Parallel Multigrid with the DAGH package: Specifications and Applications: Postscript
RNPL: Rapid Numerical Prototyping Language (R. Marsa and M. Choptuik)
The RNPL Reference Manual: HTML or Postscript
The RNPL User's Guide: HTML or Postscript
Man pages for BBHUTIL routines: Postscript
The RNPL Distribution
CVS: html documentation (Cornell)
Toolkit Meeting/Presentations:
Computational Toolkit Meeting, Austin, TX (01/27/95)
Presentations, (GC Meeting, Illinois, Nov'94)
Jim Browne
Matt Choptuik
Manish Parashar
GridSim: A Simulation Tool for Distributed Adaptive Grid Hierarchies (DAGHs)
Fortran 90 Data Structure Specification (UT Austin + NPAC, Syracuse)
HDF File Transfer Utilities
Multigrid Bibliography (S. Klasky, M. Choptuik)
Locally Developed Explorer (TM) Modules (M. Choptuik)

The Computational Toolkit

The objective of the computational toolkit is to provide language & data-structure support, and a comprehensive development and execution environment for numerical relativity applications on massively parallel systems. The project is part of the Binary Black Holes Grand Challenge
Design Overview

Implementation Phase I

(Robert Marsa & Matt Choptuik)

Phase I of the toolkit aims at developing a FD "skeletonizer" that generates skeletons codes from an abstracts problem specification. The user then fills in the code templates to complete an implementation of the problem. Slides from Matt Choptuik's presentation summarizing the Phase I implementation of the toolkit (Grand Challenge Meeting at Urbana, Illinois, Nov 7-8) included below.
Matt's Illinois Presentation
Phase I is largely completed thanks to Robert Marsa's implementation of RNPL (view the reference manual), a language for facilitating time-dependent finite-difference computations.

Implementation Phase II

(Manish Parashar & Jim Browne)

Support for Parallel Adaptive Finite Difference Methods

We are currently developing programming abstractions and data-structure support for parallel/distributed adaptive finite-difference methods. A overview of issues and requirements as well as some design ideas were presented at the Grand Challenge Meeting at Urbana, Illinois, (Nov 7-8). A link to my tranperencies is included below. An early version (draft) of a report describing our approach is also linked.
A survey of software systems supporting parallel/distributed grids
Illinois Presentation
"An Infrastructure for Parallel Adaptive Mesh-Refinement Techniques" [Draft]
"DAGH: A Users Guide"
"On Partitioning Dynamic Adaptive Grid Hierarchies"
" Distributed Dynamic Data-Structures for Parallel Adaptive Mesh-Refinement"

GridSim: A Simulation Tool for Distributed Adaptive Grid Hierarchies (DAGHs)

(Manish Parashar, Scott Klasky & Matt Choptuik)

GridSim is a trace-based simulator that provides the ability to visualize the dynamic of the grid hierarchy associated with an application. In addition it provides information about the computational load associated with each grid, in inter-grid prolongation/restriction costs and the regridding overheads. The final objective of this project is to provide a platform to allow a developer to experiment with different distributions of the grid hierarchy (DAGH) and analyse associated computational and communication costs, and dynamic load balancing requirements.

Fortran 90 Data Structure Specification

(Matt Choptuik & Tom Haupt)

Official Fortran 90 data structure (May 1994)
Example Fortan 90 program (Tom Haupt)
Issues to be discussed (Tom Haupt)
Summary of changes (Tom Haupt)
Texas adaptation (Matt Choptuik)

HDF File Tranfer Utilities

(Matt Choptuik)

F77 3-d grid function (GF3) <--> HDF utilities
Sample writer (creates the following HDF files:)
Sample reader
Utility routines for sample writer/reader
f77 header file for development of HDF utilities
Miscellaneous HDF Documentation

Supported by NSF ACS/PHY 9318152 (ARPA supplemented)
Manish Parashar,
Center for Relativity & Department of Computer Sciences,
University of Texas at Austin