ii31overview.htm
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<title>II.3.1. Overview</title>
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<p class=heading-2>II.3.1. Overview</p>
<p class=heading-2-p> </p>
<p align="justify" class=normal>After a model was drawn or retrieved from the
disk, the user can simulate it. Three modes of simulation are implemented in
the <b><i>PN Toolbox</i></b>, namely: <b><i>Step</i></b>, <b><i>Run Slow</i></b>
and <b><i>Run Fast</i></b>, that are called from the <b><i><a href="i25simulationmenu.htm">Simulation</a></i></b>
menu or from the <b><i><a href="i7simulationpanel.htm">Simulation Panel</a></i></b>.</p>
<p align="justify" class=normal> </p>
<p align="justify" class=normal id="step">The <b><i>Step</i></b> simulation mode ensures
the progress of the simulation by a single step, when the status of a transition
is changed from enabled to fired, or from fired to disabled. With the occurrence
of each event two successive steps are associated, meaning the complete treatment
of the firing transition.</p>
<p align="justify" class=normal> </p>
<p align="justify" class=normal id="runslow"> The <b><i>Step</i></b> and <b><i>Run Slow </i></b>simulation
modes are accompanied by animation. The animation displays the current number
of tokens in the places of the net and colors transitions when they are fired.
In the <b><i>Run Slow</i></b> mode, the speed of animation is adjustable from
the <b><i>Animation Speed</i></b> option in the <b><i><a href="i25simulationmenu.htm#Pref">Simulation/Preferences</a>
</i></b>dialogue box. The simulation can be stopped with a right-click.</p>
<p align="justify" class=normal> </p>
<p align="justify" class=normal id = "status"> In these two modes, the <b><i><a href="i8statuspanel.htm">Status
Panel</a></i></b> placed in the bottom left-hand corner of the screen presents
the number of events and the current time. </p>
<p align="justify" class=normal> </p>
<p align="justify" class=normal id="logfile">Also, the user can record the progress of the
simulation by using the <b><i><a href="i25simulationmenu.htm#LogFile">Log File</a></i></b>
command from the <b><i><a href="i25simulationmenu.htm">Simulation</a> </i></b>menu.
This journal is automatically saved in the project directory as an <i>HTML</i>
file and can be read by means of any Internet browser using the <b><i><a href="i25simulationmenu.htm#ViewHistory">Simulation/View
history</a></i></b> command available in the <b><i>PN Toolbox</i></b>.</p>
<p align="justify" class=normal> </p>
<p align="justify" class=normal id="runfast">Note that in <b><i>Step</i></b> or <b><i>Run Slow</i></b>
modes, the <b><i><a href="ii38scope.htm">Scope</a></i></b> and <b><i><a href="ii37diary.htm">Diary</a></i></b>
facilities are available during the simulation. Their usage is relevant when
studying timed PN. The <b><i>Run Fast</i></b> simulation mode is not accompanied
by animation and the simulation speed depends on the computer performances.
This mode is recommended when the user is interested in estimating global performance
indices of the PN model over a large time horizon (or, equivalently, for the
occurrence of a large number of events).</p>
<p align="justify" class=normal> </p>
<p align="justify" class=normal id="breakpoint">From the <b><i><a href="i25simulationmenu.htm#Breakpoint">Simulation/Breakpoint</a></i></b>
submenu the user can control the end point of the simulation in the <b><i>Run
Fast</i></b> mode. The simulation is stopped by default when 1000 events have
occurred or if no transition can fire any longer (i.e. when deadlock appears).</p>
<p align="justify" class=normal> </p>
<p align="justify" class=normal>In all simulation modes, immediately after the
end of the simulation, the values of the Performance Indices which characterize
the simulated dynamics are available on request, by accessing the menu <b><i><a href="i26performancemenu.htm">Performance</a></i></b>.</p>
<p align="justify" class=normal> </p>
<p align="justify" class=normal>The simulation principle is different from one
type of PN to another. Details about the simulation method implemented in the
<b><i>PN Toolbox</i></b> for each type of PN model are given in the next pages.</p><hr>
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