Mercurial > hg
view tests/test-revlog-packentry.t @ 31467:08ecec297521
bdiff: use Python memory allocator in fixws
Python has its own memory allocation APIs. For allocations
<= 512 bytes, it allocates memory from arenas. This means that
average small allocations don't call the system allocator, which
makes them faster. Also, arena allocations cut down on memory
fragmentation, which can matter for performance in long-running
processes.
Another advantage of using the Python memory allocator is that
allocations are tracked by Python. This is a bigger deal in
Python 3, as modern versions of Python have some decent built-in
tools for examining memory usage, leaks, etc.
This patch converts a trivial malloc() + free() in the bdiff code
to use the Python allocator APIs. Since the object being
operated on is a line, chances are it will use an arena. So,
this could have a net positive impact on performance (although
I didn't measure it).
author | Gregory Szorc <gregory.szorc@gmail.com> |
---|---|
date | Thu, 09 Mar 2017 11:54:25 -0800 |
parents | 6cc1f388ac80 |
children | 009d0283de5f |
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$ hg init repo $ cd repo $ touch foo $ hg ci -Am 'add foo' adding foo $ hg up -C null 0 files updated, 0 files merged, 1 files removed, 0 files unresolved this should be stored as a delta against rev 0 $ echo foo bar baz > foo $ hg ci -Am 'add foo again' adding foo created new head $ hg debugindex foo rev offset length ..... linkrev nodeid p1 p2 (re) 0 0 0 ..... 0 b80de5d13875 000000000000 000000000000 (re) 1 0 13 ..... 1 0376abec49b8 000000000000 000000000000 (re) $ cd ..