Traffic and air quality


    This document summarized the hardware requirements and software environment for both the SIMTRAP server and the networked MODEL server(s). It applies both to the development environment as well as a run-time installation of the SIMTRAP system.

    Hardware Requirement

    For the Demonstrator, the SIMTRAP SERVER requires a UNIX workstation with a high-resolution graphics system (1280 by 1024), 256 simultaneous colors, i.e., an 8 bit graphics frame buffer) with 64 MB RAM and, depending on the application, 1 GB of (data) disk space or more.

    Please note that for the operational use of the system in the exploitation phase, the Demonstrator can either be ported to Windows NT, or be redistributed to use the same hardware platform as the MODEL Server and use a Java based client-interface that can be run from any Java-enabled browser program on a PC or Network computer (NC).

    Operating System

    The SIMTRAP SERVER will be supported for the demonstration phase on SUN Sparc architectures, under SUN Solaris 2.4 or higher. Support for alternative architectures and operating systems (HP UX, IBM AIX, Intel Linux) can be arranged, but would require additional resources not foreseen in the project.

    In addition to the operating system, X Windows run-time libraries (usually part of the basic systems software. Under SUN Solaris, the necessary libraries and tools are available under /usr/openwin/lib and /usr/openwin/bin.

    Window Manager:

    Common Desktop Environment (CDE)

    The system will also require a http demon (httpd) for the client-server integration and Internet access. For more information on http and setting up a local Web server, see, for example:

    Liu, Peek, Jones, Buus, and Nye (1994)
    Managing Internet Information Services. 630 pp., O'Reilly & Associates, Inc. Sebastopol, CA. ISBN 1-56592-062-7.

    Networking: access to the SIMTRAP MODEL Server

    The host of the SIMTRAP SERVER will require a local LAN connection or Internet access for some of the systems intended functionality, and in particular, the connection to the parallel HPCN models. To access remote computing and data resources, a minimum of 64Kb/s will be required (e.g., through an ISDN phone line).

    The model server will be implemented either on a dedicated parallel machine at the GMD, or on a UNIX workstation cluster under MPI. Unless the workstation cluster running the MODEL Server is in the same LAN with the SIMTRAP Server at a demonstration site, an external connection (dedicated ISDN, Internet, see above) is required.

    Auxiliary Tools:

    As external tools for data preparation, editing etc, the following tools are recommended:

    • basic screen editor like vi
  • graphical editors and image conversion programs, including xv, xpaint, giftrans
  • a standard GIS for geographical data capture and editing, for example:
    • Arc/Info (powerful but expensive);
    • IDRISI (PC based, reasonably cheap);
    • GRASS (public domain);


In principle, the parallel versions of the DYNEMO and DYMOS programs run on all hardware platforms listed below. However the listing is sorted in order of the expected computational speed and therefore ordered according to the proposed preference. Besides, the type of the used computer platform the real computational speed depends on the number of used parallel processors, the speed of the underlying communication network and the considered model region (e.g. grid size, traffic burdens). The given values of the memory as well as the number of processors should always be considered as minimal requirement. The listing is a collection of hardware platforms the programs can definitely run on and therefore incomplete. Highly parallel systems:

(e.g. Intel paragon, Cray T3D, Thinking Machines CM5, Parsytec Power GC or CC, IBM SP2, iPSC/860 Workstation clusters

the following UNIX platforms interconnected by a variety of networks (Ethernet,Token ring, FDDI,...) with TCP/IP. At least 2 computers with 64 MByte RAM each are necessary:

producer model operating system
SUN Sparc Solaris1 (SunOS)
SUN Sparc Solaris2
Intel Intel x86 Linux, 386BSD, NetBSD, BS DI
SGI Iris, R4000 and up Irix
DEC Alpha Digital Unix

PC Networks

AN alternative to UNIX workstations clusters are networks of the following WINDOWS platforms interconnected via TCP/IP. At least 2 computers with 64 MByte RAM each are necessary..

producer model operating system
Intel Intel x86 Windows NT
Intel Intel x86 Windows 95
DEC Alpha AXP Windows NT

Heterogeneous Networks

In addition to the above options, the SIMTRAP MODEL Server will be operational on heterogeneous networks of different platforms out of all listed computers above.

In addition to the hardware requirements a FOTRAN and C compiler has to be available on the chosen platform. PVM3 (Parallel Virtual Machine) is used as the underlying mes sage passing system. This tool allows a heterogeneous collection of workstations and supercomputers to function as a single high performance parallel machine. PVM is the existing de facto standard for distributed computing and therefore usually installed on most platforms. Should this be not the case, public domain versions of PVM are available in the Internet.

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