159 lines
5.3 KiB
ReStructuredText
159 lines
5.3 KiB
ReStructuredText
Tracers
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=======
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PythonPDEVS provides several features that allow you to trace the execution of your model.
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Here, we present four built-in tracers, and present the interface used to create your own tracer.
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For all tracers, providing the *None* object as the filename causes the trace to be printed to stdout, instead of writing it to a file.
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In the context of distributed simulation, tracing is a *destructive event*, meaning that it can only occur after the GVT.
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As such, tracing happens in blocks as soon as fossil collection occurs.
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Verbose
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-------
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The first tracer is the verbose tracer, which generates a purely textual trace of your model execution.
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It has already been presented before, and was used by invoking the following configuration option::
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sim.setVerbose(None)
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Note that this is the only built-in tracer that works without additional configuration of the model.
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An example snippet is shown below::
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__ Current Time: 0.00 __________________________________________
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INITIAL CONDITIONS in model <trafficSystem.trafficLight>
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Initial State: red
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Next scheduled internal transition at time 58.50
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INITIAL CONDITIONS in model <trafficSystem.policeman>
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Initial State: idle
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Next scheduled internal transition at time 200.00
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__ Current Time: 58.50 __________________________________________
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INTERNAL TRANSITION in model <trafficSystem.trafficLight>
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New State: green
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Output Port Configuration:
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port <OBSERVED>:
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grey
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Next scheduled internal transition at time 108.50
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__ Current Time: 108.50 __________________________________________
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INTERNAL TRANSITION in model <trafficSystem.trafficLight>
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New State: yellow
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Output Port Configuration:
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port <OBSERVED>:
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yellow
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Next scheduled internal transition at time 118.50
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...
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__ Current Time: 200.00 __________________________________________
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EXTERNAL TRANSITION in model <trafficSystem.trafficLight>
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Input Port Configuration:
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port <INTERRUPT>:
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toManual
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New State: manual
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Next scheduled internal transition at time inf
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INTERNAL TRANSITION in model <trafficSystem.policeman>
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New State: working
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Output Port Configuration:
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port <OUT>:
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toManual
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Next scheduled internal transition at time 300.00
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XML
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---
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The second tracer is the XML tracer, which generates an XML-structured trace of your model execution, compliant to the notation presented in `Bill Song's thesis <http://msdl.cs.mcgill.ca/people/bill/thesis/latexthesis.pdf>`_.
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It can also simply be enabled by setting the following configuration option::
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sim.setXML(None)
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To enable this XML tracing, the model has to be augmented with facilities to dump the current state in the form of an XML notation.
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This is done with the *toXML()* method, which has to be defined for all complex states, and must return a string to be embedded in the XML.
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This string is pasted as-is in the trace file, and should therefore not contain forbidden characters (e.g., <).
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For example, a *toXML* method for the traffic light can look as follows::
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class TrafficLightMode:
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...
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def toXML(self):
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return "<mode>%s</mode>" % self.__colour
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An example snippet is shown below::
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<trace>
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<event>
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<model>trafficSystem.trafficLight</model>
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<time>0.0</time>
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<kind>EX</kind>
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<state>
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<mode>red</mode><![CDATA[red]]>
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</state>
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</event>
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<event>
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<model>trafficSystem.policeman</model>
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<time>0.0</time>
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<kind>EX</kind>
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<state>
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<mode>idle</mode><![CDATA[idle]]>
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</state>
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</event>
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<event>
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<model>trafficSystem.trafficLight</model>
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<time>58.5</time>
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<kind>IN</kind>
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<port name="OBSERVED" category="O">
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<message>grey</message>
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</port>
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<state>
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<mode>green</mode><![CDATA[green]]>
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</state>
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</event>
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...
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<event>
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<model>trafficSystem.policeman</model>
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<time>200.0</time>
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<kind>IN</kind>
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<port name="OUT" category="O">
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<message>toManual</message>
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</port>
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<state>
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<mode>working</mode><![CDATA[working]]>
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</state>
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</event>
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<event>
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<model>trafficSystem.trafficLight</model>
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<time>200.0</time>
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<kind>EX</kind>
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<port name="INTERRUPT" category="I">
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<message>toManual</message>
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</port>
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<state>
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<mode>manual</mode><![CDATA[manual]]>
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</state>
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</event>
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</trace>
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VCD
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---
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TODO
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Cell
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----
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The cell tracer is discussed separately, as it has very specific behaviour and is only applicable to a select number of models.
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