Hi,
Our team has been intensively using SQLAlchemy for five years now. Over the
years, we've accumulated a large number of models (roughly 350).
Over time, our app start-up has also slowed quite a bit. This has some
negative effects since it's tied to several dev processes like starting up
a shell environment, locally reloading our web server, and running our
tests.
I have been doing some profiling to try to identify why, and it turns out a
large portion of this time (~4.5s) is taken up setting up the model classes
and configuring the mappers:
- 2.1s is spent setting up the initial mappings:
sqlalchemy/ext/declarative/base.py:106(setup_mapping)
- 2.4s is spent configuring the mapping:
sqlalchemy/orm/mapper.py:2945(configure_mappers)
While each individual call does not take much time, it ends up taking a
long time cumulatively for our hundreds of models.
Does anybody have advice on changes we can make to our app or models to
improve the performance here? Attached some SQLAlchemy perf files. Happy to
dive more into these if they might be tackleable on my end!
--
SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
To post example code, please provide an MCVE: Minimal, Complete, and Verifiable
Example. See http://stackoverflow.com/help/mcve for a full description.
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ncalls tottime percall cumtime percall filename:lineno(function)
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506/441 0.010 0.000 0.051 0.000
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55/45 0.000 0.000 0.049 0.001
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