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  • Committer: John Arbash Meinel
  • Date: 2009-10-29 16:15:43 UTC
  • mto: This revision was merged to the branch mainline in revision 4780.
  • Revision ID: john@arbash-meinel.com-20091029161543-tdqlm2l4e2z5o7le
We don't have to pad 'short' records.

When writing a row, we reserve 120 bytes from the first node so that we
can write our 'B+Tree Graph Index' signature and other meta-information.
For the root node, we don't always use the 120 bytes, and for non-root
rows, we don't use that data at all. So we usually pad back that
record. However, for indexes that fit entirely in the root record,
we don't pad them to 4096, and it turns out we don't need to pad
them with the spare 120 bytes either.

I was doing a test with lots of 'chained' btree indexes, and this
extra padding ended up being 4.6M => 4.3M of wasted space. I imagine
that bzr-search will have a similar issue with tiny indexes.

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tests/test_ids.py
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# Copyright (C) 2007 Jelmer Vernooij <jelmer@samba.org>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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from bzrlib.plugins.git import tests
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from bzrlib.plugins.git.mapping import default_mapping
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class TestRevidConversion(tests.TestCase):
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    def test_simple_git_to_bzr_revision_id(self):
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        self.assertEqual("git-experimental:"
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                         "c6a4d8f1fa4ac650748e647c4b1b368f589a7356",
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                         default_mapping.revision_id_foreign_to_bzr(
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                            "c6a4d8f1fa4ac650748e647c4b1b368f589a7356"))
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    def test_simple_bzr_to_git_revision_id(self):
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        self.assertEqual("c6a4d8f1fa4ac650748e647c4b1b368f589a7356",
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                         default_mapping.revision_id_bzr_to_foreign(
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                            "git-experimental:"
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                            "c6a4d8f1fa4ac650748e647c4b1b368f589a7356"))