Opened 9 years ago

Closed 9 years ago

#25805 closed Cleanup/optimization (needsinfo)

Django 1.8 startup takes longer than Django 1.7

Reported by: Filipe Pina Owned by: nobody
Component: Uncategorized Version: 1.8
Severity: Normal Keywords:
Cc: Triage Stage: Unreviewed
Has patch: no Needs documentation: no
Needs tests: no Patch needs improvement: no
Easy pickings: no UI/UX: no

Description

Hi, this is less of a bug and more of a RFI..

I've recently noticed on a django (1.8.6) project I run in a Raspberry Pi (model B+) that manage.py always takes more than 20secs to import all modules. I assumed it was due to RPi poor performance but then I noticed on a different project (that uses django 1.7.x) that it took less than 7 secs to do the same.

Steps to reproduce (and compare):

[fopina@izdoors test2]$ virtualenv2 env
New python executable in env/bin/python2
Also creating executable in env/bin/python
Installing setuptools, pip, wheel...done.
[fopina@izdoors test2]$ . env/bin/activate
(env)[fopina@izdoors test2]$ pip install Django
Collecting Django
  Using cached Django-1.8.6-py2.py3-none-any.whl
Installing collected packages: Django
Successfully installed Django-1.8.6
(env)[fopina@izdoors test2]$ django-admin startproject t18
(env)[fopina@izdoors test2]$ cd t18/
(env)[fopina@izdoors t18]$ time (echo 1 | python manage.py shell)
Python 2.7.10 (default, Sep 17 2015, 19:25:26) 
[GCC 5.2.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> 1

>>> 
real	0m23.555s
user	0m22.810s
sys	0m0.480s

And with 1.7.10, on the same Pi:

[fopina@izdoors test]$ virtualenv2 env
New python executable in env/bin/python2
Also creating executable in env/bin/python
Installing setuptools, pip, wheel...done.
[fopina@izdoors test]$ . env/bin/activate
(env)[fopina@izdoors test]$ pip install Django==1.7.10
Collecting Django==1.7.10
  Downloading Django-1.7.10-py2.py3-none-any.whl (7.4MB)
    100% |################################| 7.4MB 3.2kB/s 
Installing collected packages: Django
Successfully installed Django-1.7.10
(env)[fopina@izdoors test]$ django-admin startproject t17
(env)[fopina@izdoors test]$ cd t17/
(env)[fopina@izdoors t17]$ time (echo 1 | python manage.py shell)
Python 2.7.10 (default, Sep 17 2015, 19:25:26) 
[GCC 5.2.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> 1

>>> 
real	0m7.689s
user	0m6.340s
sys	0m0.400s

I've tried going through the imports done in 1.8 to see if there was anything I could do to improve its time but I failed to identify the guilty ones...
I've downgraded my application to django 1.7 because it has a lot of management commands and I had no impact, but I was wondering if it's a known fact that 1.8 has a lot more (or heavier) imports than 1.7..

Thanks

Change History (5)

comment:1 by Filipe Pina, 9 years ago

Type: UncategorizedCleanup/optimization

comment:2 by Tim Graham, 9 years ago

Summary: Raspberry Pi 1.7 vs 1.8 performanceDjango 1.8 startup takes longer than Django 1.7

No immediate ideas come to mind. Can you bisect to find the commit where the performance changed?

comment:3 by Collin Anderson, 9 years ago

Also, did you try running the 1.8 test _after_ you ran the 1.7 test? The time difference could just be loading shared python code from the SD card into ram for the first time.

comment:4 by Aymeric Augustin, 9 years ago

Perhaps Django 1.8 gained some checks which are expensive on this particular project?

You could test for that by running:

export DJANGO_SETTINGS_MODULE=yourproject.settings
time python -c "import django; django.setup()"

How long does that take on 1.7 and 1.8?

Try running it on 1.7, 1.8, 1.7, 1.8 for the reason Collin brought up.

Version 0, edited 9 years ago by Aymeric Augustin (next)

comment:5 by Tim Graham, 9 years ago

Resolution: needsinfo
Status: newclosed
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