Slow EV3 screen update in EV3 Python v2 #526
Description
ev3dev version: 4.14.61-ev3dev-2.2.2-ev3
ev3dev-lang-python version:
ii python3-ev3dev 1.2.0 all Python language bindings for ev3dev
ii python3-ev3dev2 2.0.0~beta1 all Python language bindings for ev3dev
This script seems to show that it takes more than 3s for the screen to update in EV3 Python v2:
#!/usr/bin/env python3
# v2
from ev3dev2.display import Display
from sys import stderr
from time import sleep, time
screen = Display()
start_time = time()
for i in range(10):
screen.update()
print(time()-start_time, file=stderr)
Result:
3.3111462593078613
6.4367356300354
9.531918287277222
12.596878051757812
15.702414512634277
18.824042558670044
21.96616840362549
25.0904278755188
28.212737321853638
31.273113012313843
Average update time 3.13s assuming other code takes insignificant time.
The Python 1 script below gives average update time of 0.73s, or more than four times faster than for v2:
#!/usr/bin/env python3
# v1
from ev3dev.ev3 import *
from sys import stderr
from time import sleep, time
screen = Screen()
start_time = time()
for i in range(10):
screen.update()
print(time()-start_time, file=stderr)
Times:
0.7801563739776611
1.5146124362945557
2.2300970554351807
2.974599599838257
3.658750534057617
4.398235082626343
5.121510028839111
5.818562984466553
6.541661977767944
7.269548177719116
Something wrong in the new version?