Good evening all,
I have created a CPU heavy function which I need to iterate 50 times with input from a list and then I am using the multiprocessing pool to synchronously compute the 50 functions. It works but creates a new window for each new process and only after I close these windows I do get the result. Is there a way to not open the window each time? I have tried multiple multiprocessing methods, but all do the same.
import sqlite3
import random
import time
import concurrent.futures
from multiprocessing import Pool
from tkinter import *
import time
window = Tk()
window.title("APP")
def bigF(list):
n=list[0] # Extract multiple var from list
n2=list[1]
new = f(n) # The CPU heavy computation.
if n2 == new:
return True
else:
return False
def Screen1():
window.geometry("350x250")
# Lables and entry windows.
btn = Button(window, text='S2', command=Screen2)
btn.pack(pady=10)
def Screen2():
window.geometry("350x220")
# Lables and entry windows.
def getP():
user = user.get()
cursor.execute(database)
try:
return cursor.fetchall()[0][0]
except IndexError:
raise ValueError('')
def getS():
user = user.get()
cursor.execute(database)
return cursor.fetchall()[0][0]
def getS2():
user = user.get()
cursor.execute(database)
return cursor.fetchall()[0][0]
def function():
try:
var = getP()
except ValueError:
return False
s = getS()
s2 = getS2()
t = t.get()
if __name__ == '__main__':
list1=[]
listt=[]
list3=[]
list1[:0]=somestring
random.shuffle(list1)
for i in range(len(list1)):
listt.append(list1[i])
listt.append(var)
listt.append(s)
listt.append(s2)
listt.append(t)
list3.append(listt)
listt=[]
with Pool(50) as p:
values = p.map(bigF, list3)
if True in values:
someF()
else:
# Lables
btn = Button(window, text='function', command=function)
btn.pack(pady=10)
sgn = Button(window, text='S1', command=Screen1)
sgn.pack(padx=10, side=RIGHT)
def someF():
window.geometry("350x350")
# Lables and entry windows.
Screen1()
window.mainloop()
I don't know if the problem is in bigF(list) or the multiprocessing way. I aim to shorten the processing time to less than 2 seconds where 1 bigF(list) takes around 0.5 seconds.
Thank you for any suggestions and comments.
You need to read the cautions in the multiprocessing doc. When your secondary processes start, it starts a new copy of the interpreter and re-executes your main code. That includes starting a new main window. Anything that should be run in the main process only needs to be inside if __name__=='__main__':. So you need:
if __name__ == '__main__':
windows = Tk()
window.title("APP")
Screen1()
window.mainloop()