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annotate README @ 23343:f8a2647fe020

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setdiscovery: avoid a full changelog graph traversal We were definitely being suboptimal here: we were constructing two full sets, one with the full set of common nodes (i.e. a graph traversal) and one with all nodes. Then we subtract one set from the other. This whole process is O(commits) and causes discovery to be significantly slower than it should be. Instead, keep track of common incrementally and keep undecided as small as possible. This makes discovery massively faster on large repos: on one such repo, 'hg debugdiscovery' over SSH with one commit missing on the client and five on the server went from 4.5 seconds to 1.5. (An 'hg debugdiscovery' with no commits missing on the client, i.e. connection startup time, was 1.2 seconds.)
author Siddharth Agarwal <sid0@fb.com>
date Sun, 16 Nov 2014 00:40:29 -0800
parents df5ecb813426
children 4b0fc75f9403
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1 Mercurial
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2 =========
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3
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4 Mercurial is a fast, easy to use, distributed revision control tool
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5 for software developers.
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6
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Matt Mackall <mpm@selenic.com>
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7 Basic install:
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8
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9 $ make # see install targets
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10 $ make install # do a system-wide install
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11 $ hg debuginstall # sanity-check setup
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12 $ hg # see help
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14 Running without installing:
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15
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16 $ make local # build for inplace usage
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17 $ ./hg --version # should show the latest version
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18
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19 See http://mercurial.selenic.com/ for detailed installation
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20 instructions, platform-specific notes, and Mercurial user information.