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https://github.com/YunoHost-Apps/ihatemoney_ynh.git
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74df614007
By defaut, SQLAlchemy uses lazy loading, which means that displaying n bills will generate around n queries (to get the list of owers of each bill). Pre-load the list of owers to drastically decrease the number of SQL queries. Before this commit: 1004 SQL queries, 7535 ms elapsed time, 7536 ms CPU time, 530 ms SQL time After this commit: 5 SQL queries, 3342 ms elapsed time, 3393 ms CPU time, 15 ms SQL time Measured request: display the list of all bills for the project (without displaying the sidebar with balances) 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 with 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 | ||