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Re: [sumo-user] Using traci.simulation.loadState increases memory usage
Hi,

I have attached both the .py and .txt files below.

On Tue, Mar 30, 2021 at 4:50 AM <Maria.Armellini@xxxxxx> wrote:

Hi Abdullah,

 

I cannot see your .py file. Would you please send it as a .txt file?

 

Regards,

Giuliana

 

Von: sumo-user <sumo-user-bounces@xxxxxxxxxxx> Im Auftrag von . Abdullah
Gesendet: Montag, 29. März 2021 16:50
An: Sumo project User discussions <sumo-user@xxxxxxxxxxx>
Betreff: [sumo-user] Using traci.simulation.loadState increases memory usage

 

Hi,

 

I have noticed that if I use traci.simulation.loadState multiple times then my memory usage increases significantly. I have attached a simple code below, where cars are being added to the network and after every 5 seconds, a state is being saved and loaded back up. If I do this multiple times, it increases my memory usage. You can try the same code again by commenting out line 47 and it will drastically reduce the memory usage. Is there something I am doing wrong and is there a way around this?    

 

--

Thank you.

Abdullah

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--
Thank you.
Abdullah
import os
import sys, gc
import optparse
import time
import json
import numpy as np
import random

# we need to import some python modules from the $SUMO_HOME/tools directory
if 'SUMO_HOME' in os.environ:
    tools = os.path.join(os.environ['SUMO_HOME'], 'tools')
    sys.path.append(tools)
else:
    sys.exit("please declare environment variable 'SUMO_HOME'")


from sumolib import checkBinary  # Checks for the binary in environ vars
import traci

def add_vehicle(): 
    additional_route_ID = traci.route.getIDList()
    no_of_cars = 60 - traci.simulation.getMinExpectedNumber()
    for i in range(no_of_cars):
        routeID = random.choice(additional_route_ID)
        while True:
            additional_veh_ID = random.randint(0,10000000)
            vehID = "addtionVehical."+str(additional_veh_ID)
            try:
                traci.vehicle.add(vehID, routeID, "car")
                break
            except:
                pass
def run():
    print('saving')
    step = 0
    traci.start([checkBinary('sumo'), "-c", "config.sumocfg", "--step-length", "0.5", '--save-state.rng', "--step-method.ballistic", "--no-step-log", "--no-warnings", "--tripinfo-output", "tripinfo.xml"])
    simulation_time = 10*60  # increasing this increases Memory usage
    while step <= simulation_time:
        print(step)
        add_vehicle() # adding vehicles to the network
        traci.simulationStep()
        step += traci.simulation.getDeltaT()
        if step % 5 == 0:
            for _ in range(200): 
                traci.simulation.saveState('saved_state')
                # Save state and work on it and then load back the state
                traci.simulation.loadState('saved_state') # this uses a lot of memory, comment it to see the difference
    traci.close()     
        
    
# main entry point
if __name__ == "__main__":
    run()

Attachment: traci_demo.py
Description: Binary data

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