Mercurial > hg-stable
view tests/test-lfs-pointer.py @ 42480:66c27df1be84
deltas: skip if projected delta size is bigger than previous snapshot
Before computing any delta, we get a basic estimation of the delta size we can
expect and the resulted compressed value. We then checks this projected size
against the `size(snapshotⁿ) > size(snapshotⁿ⁺¹)` constraint. This allows to
exclude potential base candidates before doing any expensive computation.
This only apply to the intermediate-snapshot case since this constraint only
apply to them.
For some pathological cases of a private repository this step provide a
significant performance boost (timing from `hg perfrevlogwrite`):
before: 14.115908 seconds
after: 3.145906 seconds
author | Valentin Gatien-Baron <vgatien-baron@janestreet.com> |
---|---|
date | Thu, 25 Apr 2019 22:50:33 +0200 |
parents | 8a08aefa9273 |
children | 2372284d9457 |
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from __future__ import absolute_import, print_function # Import something from Mercurial, so the module loader gets initialized. from mercurial import pycompat del pycompat # unused for now from hgext.lfs import pointer def tryparse(text): r = {} try: r = pointer.deserialize(text) print('ok') except Exception as ex: print((b'%s' % ex).decode('ascii')) if r: text2 = r.serialize() if text2 != text: print('reconstructed text differs') return r t = (b'version https://git-lfs.github.com/spec/v1\n' b'oid sha256:4d7a214614ab2935c943f9e0ff69d22eadbb8f32b1' b'258daaa5e2ca24d17e2393\n' b'size 12345\n' b'x-foo extra-information\n') tryparse(b'') tryparse(t) tryparse(t.replace(b'git-lfs', b'unknown')) tryparse(t.replace(b'v1\n', b'v1\n\n')) tryparse(t.replace(b'sha256', b'ahs256')) tryparse(t.replace(b'sha256:', b'')) tryparse(t.replace(b'12345', b'0x12345')) tryparse(t.replace(b'extra-information', b'extra\0information')) tryparse(t.replace(b'extra-information', b'extra\ninformation')) tryparse(t.replace(b'x-foo', b'x_foo')) tryparse(t.replace(b'oid', b'blobid')) tryparse(t.replace(b'size', b'size-bytes').replace(b'oid', b'object-id'))