> This randomness calculation should be off when we use --random false. No. This is not what option --random does. Please see https://sumo.dlr.de/docs/Simulation/Randomness.html As long as vehicles have sigma > 0 (default is 0.5) there will be random speed fluctuations between your partitions.
Am Mi., 22. Feb. 2023 um 14:23 Uhr schrieb Mahima <[email protected]>: > Hi, > > We have developed a parallel framework over SUMO. When I am copying > vehicles from one partition to another. With the vehicles I am also copying > the following lane change parameters. I am keeping sigma 0, --random false > and same seed value for all the partitions and sequential SUMO. > > "laneChangeModel.speedGainProbabilityRight" > "laneChangeModel.keepRightProbability" > "laneChangeModel.lookAheadSpeed" > > After adding vehicles in the next partition, I am also moving them for the > desired position in the current step and setting speed for the current > step. > i am calculating the current step speed as follows: > > double vthis=LastTimestepSpeed+ACCEL2SPEED(LastTimestepAcceleration); > Or if the vehicle has a Leader...then with the follow speed. > > But if I compare travel time of this parallel framework with sequential > SUMO, I am getting an accuracy error. > > I have found that patchSpeedBeforeLC is calculating some different speed > which is causing randomness. > > vDawdle = MAX2(vMin, dawdle2(vMax, sigma, veh->getRNG())); > > This randomness calculation should be off when we use --random false. > > Thanks, > Mahima > > On Wed, Feb 22, 2023 at 1:41 PM Jakob Erdmann <[email protected]> > wrote: > >> The function getStopSpeed is not only used for <stop> elements but also >> for approaching intersections where a vehicle needs to come to a stop. >> From your description it is not clear what exactly you are doing and why >> you are observing a differences between some speeds and some other speeds. >> >> >> Am Di., 21. Feb. 2023 um 14:24 Uhr schrieb Mahima <[email protected]>: >> >>> Thanks for your reply. >>> Yes, sigma is already set as 0. The only difference I can see is the >>> stop speed (getStopSpeed) is different. >>> >>> How can I set the stop speed of a vehicle? Is it by using >>> libsumo::Vehicle::setStopParameter? But then I need to define the stop >>> first...correct? >>> >>> Thanks. >>> >>> On Sun, Feb 19, 2023 at 3:28 PM Jakob Erdmann <[email protected]> >>> wrote: >>> >>>> > Why does the vehicle need information about the vehicle on the >>>> previous edge for the car following model speed calculation? >>>> This is likely a misunderstanding. What gives you that impression? >>>> >>>> > How can I set the car following model parameters from the previous >>>> partition to the master partition such that it gives the same speed >>>> calculation of a vehicle? >>>> The default car-following model doesn't have internal state so it >>>> should reproduce the same behavior when faced with the same situation >>>> (distance, ego speed, leader speed, deceleration capabilities, >>>> speedFactor). A possible cause for difference is the random component >>>> (sigma). You can check whether the differences are due to randomness by >>>> setting sigma=0. >>>> >>>> Am So., 19. Feb. 2023 um 11:36 Uhr schrieb Mahima <[email protected]>: >>>> >>>>> Hi, >>>>> >>>>> Why does the vehicle need information about the vehicle on the >>>>> previous edge for the car following model speed calculation? >>>>> How can I set the car following model parameters from the previous >>>>> partition to the master partition such that it gives the same speed >>>>> calculation of a vehicle? >>>>> >>>>> Thanks >>>>> >>>>> On Wed, Sep 28, 2022 at 9:48 AM Jakob Erdmann <[email protected]> >>>>> wrote: >>>>> >>>>>> using getParameter / setParameter with the following values should be >>>>>> enough for the default lanechangem model: >>>>>> "laneChangeModel.speedGainProbabilityRight" >>>>>> "laneChangeModel.keepRightProbability" >>>>>> "laneChangeModel.lookAheadSpeed" >>>>>> >>>>>> Am Mo., 26. Sept. 2022 um 09:58 Uhr schrieb Mahima < >>>>>> [email protected]>: >>>>>> >>>>>>> When I am copying a vehicle from one partition to the other on the >>>>>>> same lane and position as it was on the previous partition, but in the >>>>>>> current timestep if there was a lane change decision in the previous >>>>>>> partition......which lane change API or flag will give me the same lane >>>>>>> change decision in the master partition. >>>>>>> In this scenario, I am already making sure that the neighbouring >>>>>>> vehicles for this vehicle are the same as on the previous partition. >>>>>>> >>>>>>> Please suggest. >>>>>>> >>>>>>> On Mon, Sep 26, 2022 at 9:39 AM Jakob Erdmann <[email protected]> >>>>>>> wrote: >>>>>>> >>>>>>>> No. TraCI runs before the computation of this step's values ( >>>>>>>> https://sumo.dlr.de/docs/Developer/Implementation_Notes/Simulation_Loop.html#main_vehicle_update_loop >>>>>>>> ) >>>>>>>> >>>>>>>> Am So., 25. Sept. 2022 um 11:02 Uhr schrieb Mahima < >>>>>>>> [email protected]>: >>>>>>>> >>>>>>>>> Hi, >>>>>>>>> >>>>>>>>> Is there any way to read the vehicle's speed, lane and position in >>>>>>>>> the current timestep? >>>>>>>>> >>>>>>>>> libsumo::Vehicle::getLanePosition >>>>>>>>> libsumo::Vehicle::getSpeed >>>>>>>>> All these APIs, give information about the last timestep. >>>>>>>>> >>>>>>>>> Thanks >>>>>>>>> _______________________________________________ >>>>>>>>> sumo-user mailing list >>>>>>>>> [email protected] >>>>>>>>> To unsubscribe from this list, visit >>>>>>>>> https://www.eclipse.org/mailman/listinfo/sumo-user >>>>>>>>> >>>>>>>> _______________________________________________ >>>>>>>> sumo-user mailing list >>>>>>>> [email protected] >>>>>>>> To unsubscribe from this list, visit >>>>>>>> https://www.eclipse.org/mailman/listinfo/sumo-user >>>>>>>> >>>>>>> _______________________________________________ >>>>>>> sumo-user mailing list >>>>>>> [email protected] >>>>>>> To unsubscribe from this list, visit >>>>>>> https://www.eclipse.org/mailman/listinfo/sumo-user >>>>>>> >>>>>> _______________________________________________ >>>>>> sumo-user mailing list >>>>>> [email protected] >>>>>> To unsubscribe from this list, visit >>>>>> https://www.eclipse.org/mailman/listinfo/sumo-user >>>>>> >>>>> _______________________________________________ >>>>> sumo-user mailing list >>>>> [email protected] >>>>> To unsubscribe from this list, visit >>>>> https://www.eclipse.org/mailman/listinfo/sumo-user >>>>> >>>> _______________________________________________ >>>> sumo-user mailing list >>>> [email protected] >>>> To unsubscribe from this list, visit >>>> https://www.eclipse.org/mailman/listinfo/sumo-user >>>> >>> _______________________________________________ >>> sumo-user mailing list >>> [email protected] >>> To unsubscribe from this list, visit >>> https://www.eclipse.org/mailman/listinfo/sumo-user >>> >> _______________________________________________ >> sumo-user mailing list >> [email protected] >> To unsubscribe from this list, visit >> https://www.eclipse.org/mailman/listinfo/sumo-user >> > _______________________________________________ > sumo-user mailing list > [email protected] > To unsubscribe from this list, visit > https://www.eclipse.org/mailman/listinfo/sumo-user >
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