Index out of bounds

[Ezequiel Puerta]

Hi again! I get this error during an experiment with the "Make species schedule their agents in parallel" option set in True.

Two different agents are trying to insert the current_date in the same list, and I guess one of the agents was using a wrong reference about the end of the list, and that's why the error is raised. If I deactivate the agent scheduling option, the error doesnt appear.

Note that I do not insert the date directly, but first save it in a temporary variable to filter out some very sporadic cases in which the current_date is nil.

Any ideas? Is there a possibility to allow parallel scheduling of agents for most of your reflexes but synchronous for some others? or to manage some kind of semaphore or mutex?

Thanks a lot

[Benoit Gaudou]

Hi,

First there is no semaphore or mutex in GAMA... I am not sure they will be added one day...

For your question about havin some part of the behavior in parallel and some other one not, you could imagine:

- use the parallel facet for a species, so that all its reflexes will be executed in parallel. 

For what you do not want them to be executed in parallel, you can implement them as actions and define a new agents executing this action for all the agents (not in parallel).

- another option could be to implement every part of the behavior of agents as actions. And create an agent that will execute these actions (using ask species parallel: true/false, true/false depending on the action... ) such as : 

model NewModel

global {

init {

create titi number: 100;

create scheduler;

}

}

species scheduler {

reflex toto {

ask titi {

do w;

}

write "----------------------";

ask titi parallel: true {

do z;

}

}

}

species titi schedules: [] { 

action w {

write self;

}

action z {

write self;

}

}

experiment expe type: gui {

}

Cheers

Benoit

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