Arvados

Because these are the classes that arv-mount might instantiate several thousand of, defining __slots__ could make for a noticeable improvement in memory use at little cost.

Note that __slots__ needs to be defined on all classes to get the full benefit. Subclasses that add no attributes to their parents need to say __slots__ = ().

#21541 added slots to the most commonly instantiated classes in arvados_fuse.fusedir. The following still need to have __slots__ defined:

• TmpCollectionDirectory
• UnsaveableCollection
• MagicDirectory
• TagsDirectory
• TagDirectory
• SharedDirectory

In addition, a number of classes in arvados.collection would benefit from defining __slots__

• CollectionBase
• RichCollectionBase
• Collection
• Subcollection
• CollectionReader