Python 3 in Yocto is very slow on Raspberry Pi

Question

We used Python 2 for the embedded application that we are currently prototyping on the Raspberry Pi. It was a bit slow but acceptable.

Now we have ported the application to Python 3. But for some reason, the application runs about 4 times slower than with Python 2! I expected Python 3 to be a bit slower, but nothing like that!

Our Linux distribution is based on Yocto 2.2 Morty, and we use the standard Python 3.5.2 recipe without any configuration. We also use a meta-raspberrypi layer for compatibility with raspberries.

I tried the time "pip3 --help" and got the following result:

$ time pip3 --help >/dev/null

real    0m22.686s
user    0m22.210s
sys     0m0.420s

Then I tried the same test on the same hardware (with the same SD card) using the latest Raspbian distribution:

$ time pip3 --help >/dev/null

real    0m6.874s
user    0m6.530s
sys     0m0.310s

$ time pip --help >/dev/null

real    0m4.329s
user    0m4.000s
sys     0m0.300s

Python 2 pip , Python 3, , pip3 3 Raspbian, Yocto!

, pyc - .

, Yocto , Raspbian?

Update:

Python Pip Raspbian vs Yocto , , Python:

Yocto 2.2 Morty:

sh-4.3# time python3 --version
Python 3.5.2

real    0m0.024s
user    0m0.010s
sys     0m0.000s
sh-4.3# time python3 -c "import asyncio"

real    0m3.439s
user    0m3.300s
sys     0m0.110s

Raspbian:

pi@raspberrypi:~$ time python3 --version
Python 3.4.2

real    0m0.020s
user    0m0.000s
sys     0m0.010s
pi@raspberrypi:~$ time python3 -c "import asyncio"

real    0m2.023s
user    0m1.850s
sys     0m0.160s

Python 3.5.2 Raspbian , (./configure; make; make install). Python 3.5.2 :

pi@raspberrypi:~$ time python3.5 --version
Python 3.5.2

real    0m0.018s
user    0m0.000s
sys     0m0.010s
pi@raspberrypi:~$ time python3.5 -c "import asyncio"

real    0m2.689s
user    0m2.610s
sys     0m0.070s

, , Python 3.5 , 3.4, Yocto , Raspbian .

2:

Python 3.5.2 Yocto ( "./configure; make; make install" ) 20% Python:

root@la:/var/src/Python-3.5.2# time python3.5 -c "import asyncio"

real    0m2.914s
user    0m2.750s
sys     0m0.130s

Answer 1

Yocto Python 2 . Python 3 ( , 3.5.3+) ./configure --enable-optimizations, .