Comment 32 for bug 1626675

Reviewed: https://review.openstack.org/382068
Committed: https://git.openstack.org/cgit/openstack/heat/commit/?id=adb8629a90eff299974c7d8138fe60194d5961ec
Submitter: Jenkins
Branch: master

commit adb8629a90eff299974c7d8138fe60194d5961ec
Author: Zane Bitter <email address hidden>
Date: Tue Oct 4 16:46:58 2016 -0400

    Use __slots__ in ResourceInfo classes

    A TripleO environment typically contains hundreds of resource type
    mappings. And a TripleO deployment typically contains hundreds of nested
    stacks. The result is typically tens of thousands of ResourceInfo objects
    all loaded in memory at the same time.

    This change saves memory by using slots for these classes instead of
    __dict__. I'd expect this to save on the order of tens of megabytes of RAM
    in a TripleO deployment - comparatively modest, but an easy win given that
    it is such a simple change.

    Change-Id: Ia0f17be794618d7b41c463e1992755947c56d4d1
    Partial-Bug: #1626675