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- About NetSim…
-
- NetSim is an example of a distributed simulation using the NetWork System for
- distributed computing. More precisely: NetSim it is an example how n o t to
- run a simulation. It shows how to use the NetWork facilities for distributed
- computing. It does not show how to do a simulation.
-
- NetSim is
- Copyright © G. Sawitzki, Heidelberg 1991. All rights reserved.
-
- NetSim uses the signature 'NetE' which is reserved with Apple for NetWork experiments.
-
- NetSim is based on the Random&Template programming framework used at
- StatLab Heidelberg. See the Random&Template distribution disk for more information.
- Random&Template is in the public domain. A recent version of Random&Template is
- available for $29 from StatLab Heidelberg, Im Neuenheimer Feld 294, 6900 Heidelberg,
- W. Germany.
-
- Random number generation is basic to most simulations. The core are random numbers
- which are approximately independent uniformly distributed. NetSim uses Apple's
- random number generation which satisfies these requirements, but it does not take
- care that several copies take independent random number generators. As a matter of
- fact, it was developed to study the effect of this negligence.
-
- NetSim generates random samples take from a Gaussian (Normal) distribution. Two
- methods for estimating the scale are applied: the span (max-min) and the standard
- deviation are calculated. For a deterministic sequence, these measures of scale
- would have a constant ration. For random sample, both may differ. The distribution
- of span/standard deviation is monitored by NetSim.
-
- NetSim hunts for records of the ratio span/standard deviation. The observed samples
- yielding minimum and maximum ratios span/standard deviation are shown.
-
- In a distributed environment, NetSim asks partners to generate a new random sample and
- to calculate the ratio span/standard deviation. If a ratio is returned, it is included
- in the histogram of total statistics. If it is a new record, the sample itself is
- displayed as well.
- The ratio is returned in NetWorks priority information part, the sample itself is in the
- core information.
-
- NetSim consists of the usual units of Template, as documented in Random&Template,
- and the following special units:
- stdtools.rsrc adapted for NetSim
- HistogramUnit.p survey statistics and adaptive histograms
- HistogramIo.p display methods for survey statistics and adaptive histograms
-
- special task handlers, as indicated by name
- task.reply.impl.p
- task.slave.impl.p
- task.handlers.impl.p
- task.master.impl.p
-
- UToy.p basic random number generation
-