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https://github.com/YunoHost-Apps/ihatemoney_ynh.git
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8e5ac8ae98
This avoids creating thousands of small SQL queries when computing the
balance of users. This significantly improves the performance of
displaying the main page of a project, since the balance of users is
displayed there:
Before this commit: 4004 SQL queries, 19793 ms elapsed time, 19753 ms CPU time, 2094 ms SQL time
After this commit: 12 SQL queries, 3688 ms elapsed time, 3753 ms CPU time, 50 ms SQL time
Measured request: display the sidebar with the balance of all users for the project (without displaying the list of bills)
This commit also greatly improves the performance of the "settle bills" page:
Before this commit: 8006 SQL queries, 39167 ms elapsed time, 39600 ms CPU time, 4141 ms SQL time
After this commit: 22 SQL queries, 7144 ms elapsed time, 7283 ms CPU time, 96 ms SQL time
Measured request: display the "Settle bills" page
Test setup to measure performance improvement:
- 5 users with various weights
- 1000 bills, each paid by a random user, each involving all 5 users
- laptop with Celeron N2830@2.16 GHz, SSD Samsung 850 EVO
- sqlite database on SSD, using sqlite 3.15.2
- python 2.7.13
- Flask-DebugToolbar 0.10.0 (to count SQL queries and loading time)
Performance measurements (using Flask-DebugToolbar on the second request,
to avoid measuring cold-cache performance):
- number of SQL queries
- elapsed time (from request to response)
- total CPU time consumed by the server handling the request
- total time spent on SQL queries (as reported by SQLAlchemy)
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| .. | ||
| migrations | ||
| static | ||
| templates | ||
| translations/fr/LC_MESSAGES | ||
| __init__.py | ||
| api.py | ||
| babel.cfg | ||
| default_settings.py | ||
| forms.py | ||
| manage.py | ||
| merged_settings.py | ||
| messages.pot | ||
| models.py | ||
| requirements.txt | ||
| run.py | ||
| tests.py | ||
| utils.py | ||
| web.py | ||