How can I release memory after creating matplotlib figures

import matplotlib.pyplot as plt
from datetime import datetime
import gc

class MyClass:
    def plotmanytimesandsave(self):
        plt.plot([1, 2, 3])
        ro2 = datetime.now()
        f =ro2.second
        name =str(f)+".jpg"
        plt.savefig(name)
        plt.draw()
        plt.clf()
        plt.close("all")


for y in range(1, 10):
    k = MyClass()
    k.plotmanytimesandsave()
    del k
    k = "now our class object is a string"
    print(k)
    del k
    gc.collect

with this program you will save directly as many times you want without the plt.show() command. And the memory consumption will be low.

Did you try to run you task function several times (in a for) to be sure that not your function is leaking no matter of celery? Make sure that django.settings.DEBUG is set False( The connection object holds all queries in memmory when DEBUG=True).