~bzr-pqm/bzr/bzr.dev

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(jam, andrew) Allow StaticTuple to hold more types,
and implement the + operator.

added added

removed removed

used as the interning structure for StaticTuple objects.

(John Arbash Meinel)

* ``bzrlib._static_tuple_pyx.StaticTuple`` is now available and used by

* ``bzrlib._static_tuple_c.StaticTuple`` is now available and used by

the btree index parser. This class functions similarly to ``tuple``

objects. However, it can only point at other ``StaticTuple`` instances

or strings. This allows us to remove it from the garbage collector (it

cannot be in a cycle), it also allows us to intern the objects. In

objects. However, it can only point to a limited collection of types.

(Currently StaticTuple, str, unicode, None, bool, int, long, float, and

not subclasses). This allows us to remove it from the garbage collector

(it cannot be in a cycle), it also allows us to intern the objects. In

testing, this can reduce peak memory by 20-40%, and significantly

improve performance by removing objects from being inspected by the

garbage collector. (John Arbash Meinel)

* ``GroupCompressBlock._ensure_content()`` will now release the

``zlib.decompressobj()`` when the first request is for all of the

of internal state and buffers. (For branching bzr.dev this drops peak

memory from 382MB => 345MB.) (John Arbash Meinel)

* When streaming content between ``2a`` format repositories, we now clear

caches from earlier versioned files. (So 'revisions' is cleared when we

start reading 'inventories', etc.) This can have a significant impact on

peak memory for initial copies (~200MB). (John Arbash Meinel)

Testing

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