[Sqlalchemy-commits] commit/sqlalchemy: zzzeek: Warn on _compiled_cache growth

[Bitbucket <com...@bi...>]

1 new commit in sqlalchemy:

https://bitbucket.org/zzzeek/sqlalchemy/commits/cef4e5ff38dc/
Changeset:   cef4e5ff38dc
Branch:      master
User:        zzzeek
Date:        2017-04-12 16:53:40+00:00
Summary:     Warn on _compiled_cache growth

Added warnings to the LRU "compiled cache" used by the :class:`.Mapper`
(and ultimately will be for other ORM-based LRU caches) such that
when the cache starts hitting its size limits, the application will
emit a warning that this is a performance-degrading situation that
may require attention.   The LRU caches can reach their size limits
primarily if an application is making use of an unbounded number
of :class:`.Engine` objects, which is an antipattern.  Otherwise,
this may suggest an issue that should be brought to the SQLAlchemy
developer's attention.

Additionally, adjusted the test_memusage algorithm again as the
previous one could still allow a growing memory size to be missed.

Change-Id: I020d1ceafb7a08f6addfa990a1e7acd09f933240

Affected #:  6 files

Repository URL: https://bitbucket.org/zzzeek/sqlalchemy/

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