~bzr-pqm/bzr/bzr.dev

Viewing changes to NEWS

Bring in bzr.dev 4761 which includes CHKMap and CHKInventory tweaks.
It also brings in StaticTuple concatenation, and ability to hold None, etc.

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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