JDEQSIM vs QSIM

[gregmacfarlane]

I am running a scenario where I set some qsim parameters in the configuration, and then also load the SwissRailRaptor routing algorithm. My output configuration has both of the following sections:

<module name="JDEQSim" >
    <param name="carSize" value="7.5" />
    <param name="endTime" value="undefined" />
    <param name="flowCapacityFactor" value="1.0" />
    <param name="gapTravelSpeed" value="15.0" />
    <param name="minimumInFlowCapacity" value="1800.0" />
    <param name="squeezeTime" value="1800.0" />
    <param name="storageCapacityFactor" value="1.0" />
 </module>
<module name="qsim" >
      <!-- If set to true, creates a vehicle for each person corresponding to every network mode. Howev       er, this will be overridden if vehicle source is fromVehiclesData. -->
     <param name="creatingVehiclesForAllNetworkModes" value="true" />
     <param name="endTime" value="28:00:00" />
     <param name="flowCapacityFactor" value="0.5" />
     <!-- decides if waiting vehicles enter the network after or before the already driving vehicles w       ere moved. Default: false MANY OTHERS -->
</module>

Can someone please explain the difference between JDEQSIM and QSIM, or point me to documentation about the difference? It appears that JDEQSIM was loaded automatically with the SBBRaptor, but maybe not? If I set the flowCapacityFactor because I'm working with a smaller sample, do I have to set it in JDEQSIM also? Which flow capacity did my scenario even run with?

[golanbendor]

If I am not mistaken, currently the Qsim is the default mobility simulator in MATSim.
The JDEQSim output config parameters are printed by default (those parameters are not used) to the output config file (even if JDEQSim is not specified as the current mobsim)

Check out the MATSim book which I think covers this (page 6):

You can always use the controller to set the mobsim to use Qsim:
config.controler().setMobsim("qsim");

[gregmacfarlane]

I'm aware of QSIM being the default mobsim, but I am curious to know when and in what cases it is overridden, and how can I know when that is happening, if the JDEQSIM is still printing to the config, for instance.

[mrieser]

JDEQSim is an alternative implementation of a mobility simulation for MATSim, but it does not provide support for all the features. Public Transport and Traffic lights for example are only supported when QSim is used, not in JDEQSim.

In the configuration output, in the controler-module, there should be a parameter "mobsim" which specifies which mobility simulation is used. Make sure it is set to "qsim" to be sure that QSim is used.

[gregmacfarlane]

Okay, that's good to know. Is there a way to turn off printing modules to the config when they are not used?

[mrieser]

Is there a way to turn off printing modules

None that I'm aware of.

If you want to exclude a single module, you could try something like this:

Config config = ConfigUtils.loadConfig("path/to/my/config.xml");
config.removeModule(JDEQSimConfigGroup.NAME);

But that's rather cumbersome.