tests/test-repo-compengines.t
author Paul Morelle <paul.morelle@octobus.net>
Thu, 21 Jun 2018 18:19:57 +0200
changeset 38646 93313f66b69b
parent 37415 c2c8962a9465
child 40905 4fe18205bbdb
permissions -rw-r--r--
debugdeltachain: avoid division by zero when a chain is empty The two ratios chainratio and extraratio are computed using dividers that may be zero when the file is empty. As the denominators are integers, the limit of the ratio "just before zero" is the numerator value itself. If the numerator itself is zero, the ratio value is still meaningful: in both cases, a "good" value is a low ratio, and a size of zero is the optimal case.
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A new repository uses zlib storage, which doesn't need a requirement
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  $ hg init default
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  $ cd default
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  $ cat .hg/requires
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  dotencode
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  fncache
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  generaldelta
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  revlogv1
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  store
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  testonly-simplestore (reposimplestore !)
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  $ touch foo
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  $ hg -q commit -A -m 'initial commit with a lot of repeated repeated repeated text to trigger compression'
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  $ hg debugrevlog -c | grep 0x78
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      0x78 (x)  :   1 (100.00%)
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      0x78 (x)  : 110 (100.00%)
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  $ cd ..
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Unknown compression engine to format.compression aborts
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  $ hg --config experimental.format.compression=unknown init unknown
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  abort: compression engine unknown defined by experimental.format.compression not available
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  (run "hg debuginstall" to list available compression engines)
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  [255]
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A requirement specifying an unknown compression engine results in bail
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  $ hg init unknownrequirement
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  $ cd unknownrequirement
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  $ echo exp-compression-unknown >> .hg/requires
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  $ hg log
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  abort: repository requires features unknown to this Mercurial: exp-compression-unknown!
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  (see https://mercurial-scm.org/wiki/MissingRequirement for more information)
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  [255]
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  $ cd ..
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#if zstd
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  $ hg --config experimental.format.compression=zstd init zstd
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  $ cd zstd
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  $ cat .hg/requires
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  dotencode
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  exp-compression-zstd
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  fncache
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  generaldelta
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  revlogv1
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  store
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  testonly-simplestore (reposimplestore !)
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  $ touch foo
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  $ hg -q commit -A -m 'initial commit with a lot of repeated repeated repeated text'
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  $ hg debugrevlog -c | grep 0x28
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      0x28      :  1 (100.00%)
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      0x28      : 98 (100.00%)
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  $ cd ..
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Specifying a new format.compression on an existing repo won't introduce data
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with that engine or a requirement
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  $ cd default
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  $ touch bar
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  $ hg --config experimental.format.compression=zstd -q commit -A -m 'add bar with a lot of repeated repeated repeated text'
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  $ cat .hg/requires
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  dotencode
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  fncache
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  generaldelta
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  revlogv1
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  store
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  testonly-simplestore (reposimplestore !)
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  $ hg debugrevlog -c | grep 0x78
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      0x78 (x)  :   2 (100.00%)
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      0x78 (x)  : 199 (100.00%)
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#endif