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Spring Proceedings
Cray User Group, Inc.
INCORPORATED
PROCEEDINGS
Thirty-Third Semi-Annual
Cray User Group Meeting
San Diego, California
March 14-18, 1994
No part of this publication may be reproduced by any mechanical, photographic, or electronic process
without written permission from the author(s) and publisher. Permission requests should be made in
writing to:
Cray User Group Secretary
c/o Joan Palm
655A Lone Oak Drive
Eagan, MN 55121 USA
The CUG Proceedings is edited and produced by Karen Winget,
Fine Point Editorial Services, 1011 Ridge Valley Court, Shepherdstown, WV 25443
Cover designed by Carol Conway Leigh
Autotasking, CF77, CRAY, Cray Ada, CRAY Y-MP, CRAY-l, HSX, MPGS, SSD, SUPERSERVER, UniChem, UNICOS, and X-MP EA
are federally registered trademarks and CCI, CFT, CFf2, CFf77, COS, CRAY APP, Cray C++ Compiling System, CRAY C9Q, CRAY
EL, Cray NQS, CRAY S-MP, CRAY TID, CRAY X-MP, CRAY XMS, CRAY-2, CraylREELlibrarian, CRInform, CRVTurboKiva,
CSIM, CVT, Delivering the power ... , Docview, EMDS, lOS, MPP Apprentice, Network Queuing Environment, Network Queuing
Tools, OLNET, RQS, SEGLDR, SMARTE, SUPERCLUSTER, SUPERUNK, Trusted UNICOS, and UNICOS MAX are trademarks of Cray
Research, Inc.
Cray User Group, Inc.
BOARD OF DIRECTORS
President
Gary Jensen (NCAR)
Vice-President
Jean Shuler (NERSC)
Secretary
Gunter Georgi (Grumman)
Treasurer
Howard Weinberger (TAl)
Director
Claude Lecoeuvre (CEL-V)
Regional Director Americas
Fran Pellegrino (Westinghouse)
Regional Director Asia/Pacific
Kyukichi Ohmura (CRC)
Regional Director Europe
Walter Wehinger (RUS)
PROGRAM COMMITTEE
Jean Shuler, Chair (NERSC)
Robert Price (Westinghouse)
Helene Kulsrud (IDA)
Phil Cohen (Scripps)
LOCAL ARRANGEMENTS
Anke Kamrath
Ange Mason
Mike Vildibill
Jay Dombrowski
Phil Cohen
Dan Drobnis
Gail Bamber
Russ Sinco
Sandy Davey
Jayne Keller
CONTENTS
GENERAL SESSIONS
Chairman's Report
John F. Carlson (CRI) 3
Cray Research Corporate Report
Robert Ewald (CRI) 6
CRI Software Report
Irene Qualters (CRI) 14
Unparalleled Horizons: Computing in Heterogeneous Environments
Reagan Moore (SDSC) 21
Cray TID Project Update
Steve Reinhardt (CRI) 28
PARALLEL SESSIONS
Applications and Algorithms
Porting Third-Party Applications Packages to the Cray MPP: Experiences at the
Pittsburgh Supercomputing Center
Frank C. Wimberley, Susheel Chitre, Carlos Gonzales,
Michael H. Lambert, Nicholas Nystrom,
Alex Ropelewski, William Young (PITTSCC) 39
Some Loop Collapse Techniques to Increase Autotasking Efficiency
Mike Davis (CRI) 44
Collaborative Evaluation Project of Ingres on the Cray (CEPIC
C.B. Hale, G.M. Hale, and K.F. Witte (LANL) 65
Providing Breakthrough Gains: Cray Research MPP for Commercial Applications
DentonA. Olson (CRI) 73
Asynchronous Double-Buffered I10Applied to Molecular Dynamics Simulations of
Macromolecular Systems
Richard J. Shaginaw, Terry R. Stouch, and Howard E. Alper (BMSPRI) 76
A PVM Implementation of a Conjugate Gradient Solution Algorithm for Ground-Water Flow Modeling
Dennis Morrow, John Thorp, and Bill Holter (CRI and NASA/Goddard) 80
Graphics
Decimation of Triangle Meshes
William J. Schroeder (GE-AE) 87
v
Visualization of Volcanic Ash Clouds
Mitchell Roth (ARSC) and Rick Guritz (Alaska Synthetic Aperture Radar Facility) 92
A Graphical User Interface for Networked Volume Rendering on the Cray C90
Allan Snavely and T. Todd Elvins (SDSC) 100
Management
Heterogeneous Computing Using the Cray Y -MP and T3D
Bob Carruthers (CRI) 109
Future Operating Systems Directions
Don Mason (CRI) 112
Future Operating Systems Directions-Serverized UNICOS
Jim Harrell (CRI) 114
Mass Storage Systems
Storage Management Update
Brad Strand (CRI) 119
RAID Integration on Model-E lOS
Bob Ciotti (NASA-Ames)) 123
Automatic DMF File Expiration
Andy Haxby (Shell U.K.) 136
ER90