Main Title |
Regional Oxidant Model Multi-Processor (ROMMP). |
Author |
Roberts, A. M. ;
Young., J. O. ;
|
CORP Author |
Research Triangle Inst., Research Triangle Park, NC. Center for Digital Systems Research. ;Computer Sciences Corp., Research Triangle Park, NC.;Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab. |
Publisher |
1990 |
Year Published |
1990 |
Report Number |
EPA/600/D-90/173; |
Stock Number |
PB91-131680 |
Additional Subjects |
Air pollution ;
Ozone ;
Data processing ;
Oxidizers ;
Simulation ;
Computation ;
Prototypes ;
Performance ;
Meteorology ;
Chemistry ;
Air quality ;
Regional oxidant model ;
Emission factors ;
Air pollution control ;
Strategies ;
Multiprocessors ;
Environmental Protection Agency
|
Holdings |
Library |
Call Number |
Additional Info |
Location |
Last Modified |
Checkout Status |
NTIS |
PB91-131680 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
Collation |
26p |
Abstract |
EPA's Regional Oxidant Model (ROM), a three-dimensional model capable of describing photochemical smog on scales of 1000 km, is being used to analyze large scale pollution patterns and the effectiveness of particular emissions control strategies on reducing ozone concentrations. The ROM demands considerable computation time to perform its calculations, particularly the chemical calculations. The model currently simulates at much less than one-half of 'real-time' on a VAX 11/780 (one day of model time requires over two days of simulation time). A feasibility study was performed to support the design of a computing solution to accelerate the simulation. The study suggested the construction of a prototype parallel multiprocessor system using off-the-shelf computers, interconnected by Ethernet, as a low-risk method of increasing software performance up to 10-20x over uniprocessor speed. The prototype consists of 22 rtVAX 1000 computers as processing elements (PEs), and a VAXstation II/GPX host computer. Current work is focused on developing a variation of the tiled ROMMP (Regional Oxidant Model Multi-Processor), in order to distribute the entire computational problem to the PEs. This approach is expected to avoid the host-computational bottleneck, and achieve high levels of utilization on all the PEs in the prototype. |
Supplementary Notes |
Prepared in cooperation with Computer Sciences Corp., Research Triangle Park, NC. Sponsored by Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab. |
Category Codes |
68A; 55C |
NTIS Prices |
PC A03/MF A01 |
Primary Description |
600/09 |
Document Type |
NT |
Cataloging Source |
NTIS/MT |
Control Number |
103920553 |
Origin |
NTIS |
Type |
CAT |