Mercurial > hg
view tests/test-convert.t @ 42044:bb271ec2fbfb
compression: introduce a `storage.revlog.zstd.level` configuration
This option control the zstd compression level used when compressing revlog
chunk. The usage of zstd for revlog compression has not graduated from
experimental yet, but we intend to fix that soon.
The option name for the compression level is more straight forward to pick, so
this changesets comes first. Having a dedicated option for each compression
engine is useful because they don't support the same range of values.
I ran the same measurement as for the zlib compression level (in the parent
changesets). The variation in repository size is stay mostly in the same (small)
range. The "read/write" performance see smallish variation, but are overall much
better than zlib. Write performance show the same tend of having better write
performance for when reaching high-end compression.
Again, we don't intend to change the default zstd compression level (currently:
3) in this series. However this is worth investigating in the future.
The Performance comparison of zlib vs zstd is quite impressive. The repository
size stay in the same range, but the performance are much better in all
situations.
Comparison summary
==================
We are looking at:
- performance range for zlib
- performance range for zstd
- comparison of default zstd (level-3) to default zlib (level 6)
- comparison of the slowest zstd time to the fastest zlib time
Read performance:
-----------------
| zlib | zstd | cmp | f2s
mercurial | 0.170159 - 0.189219 | 0.144127 - 0.149624 | 80% | 88%
pypy | 2.679217 - 2.768691 | 1.532317 - 1.705044 | 60% | 63%
netbeans | 122.477027 - 141.620281 | 72.996346 - 89.731560 | 58% | 73%
mozilla | 147.867662 - 170.572118 | 91.700995 - 105.853099 | 56% | 71%
Write performance:
------------------
| zlib | zstd | cmp | f2s
mercurial | 53.250304 - 56.2936129 | 40.877025 - 45.677286 | 75% | 86%
pypy | 460.721984 - 476.589918 | 270.545409 - 301.002219 | 63% | 65%
netbeans | 520.560316 - 715.930400 | 370.356311 - 428.329652 | 55% | 82%
mozilla | 739.803002 - 987.056093 | 505.152906 - 591.930683 | 57% | 80%
Raw data
--------
repo alg lvl .hg/store size 00manifest.d read write
mercurial zlib 1 49,402,813 5,963,475 0.170159 53.250304
mercurial zlib 6 47,197,397 5,875,730 0.182820 56.264320
mercurial zlib 9 47,121,596 5,849,781 0.189219 56.293612
mercurial zstd 1 49,737,084 5,966,355 0.144127 40.877025
mercurial zstd 3 48,961,867 5,895,208 0.146376 42.268142
mercurial zstd 5 48,200,592 5,938,676 0.149624 43.162875
mercurial zstd 10 47,833,520 5,913,353 0.145185 44.012489
mercurial zstd 15 47,314,604 5,728,679 0.147686 45.677286
mercurial zstd 20 47,330,502 5,830,539 0.145789 45.025407
mercurial zstd 22 47,330,076 5,830,539 0.143996 44.690460
pypy zlib 1 370,830,572 28,462,425 2.679217 460.721984
pypy zlib 6 340,112,317 27,648,747 2.768691 467.537158
pypy zlib 9 338,360,736 27,639,003 2.763495 476.589918
pypy zstd 1 362,377,479 27,916,214 1.532317 270.545409
pypy zstd 3 354,137,693 27,905,988 1.686718 294.951509
pypy zstd 5 342,640,043 27,655,774 1.705044 301.002219
pypy zstd 10 334,224,327 27,164,493 1.567287 285.186239
pypy zstd 15 329,000,363 26,645,965 1.637729 299.561332
pypy zstd 20 324,534,039 26,199,547 1.526813 302.149827
pypy zstd 22 324,530,595 26,198,932 1.525718 307.821218
netbeans zlib 1 1,281,847,810 165,495,457 122.477027 520.560316
netbeans zlib 6 1,205,284,353 159,161,207 139.876147 715.930400
netbeans zlib 9 1,197,135,671 155,034,586 141.620281 678.297064
netbeans zstd 1 1,259,581,737 160,840,613 72.996346 370.356311
netbeans zstd 3 1,232,978,122 157,691,551 81.622317 396.733087
netbeans zstd 5 1,208,034,075 160,246,880 83.080549 364.342626
netbeans zstd 10 1,188,624,176 156,083,417 79.323935 403.594602
netbeans zstd 15 1,176,973,589 153,859,477 89.731560 428.329652
netbeans zstd 20 1,162,958,258 151,147,535 82.842667 392.335349
netbeans zstd 22 1,162,707,029 151,150,220 82.565695 402.840655
mozilla zlib 1 2,775,497,186 298,527,987 147.867662 751.263721
mozilla zlib 6 2,596,856,420 286,597,671 170.572118 987.056093
mozilla zlib 9 2,587,542,494 287,018,264 163.622338 739.803002
mozilla zstd 1 2,723,159,348 286,617,532 91.700995 570.042751
mozilla zstd 3 2,665,055,001 286,152,013 95.240155 561.412805
mozilla zstd 5 2,607,819,817 288,060,030 101.978048 505.152906
mozilla zstd 10 2,558,761,085 283,967,648 104.113481 497.771202
mozilla zstd 15 2,526,216,060 275,581,300 105.853099 591.930683
mozilla zstd 20 2,485,114,806 266,478,859 95.268795 576.515389
mozilla zstd 22 2,484,869,080 266,456,505 94.429282 572.785537
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
---|---|
date | Wed, 27 Mar 2019 18:35:59 +0100 |
parents | 7ba6b880b09a |
children | d98ec36be808 |
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$ cat >> $HGRCPATH <<EOF > [extensions] > convert= > [convert] > hg.saverev=False > EOF $ hg help convert hg convert [OPTION]... SOURCE [DEST [REVMAP]] convert a foreign SCM repository to a Mercurial one. Accepted source formats [identifiers]: - Mercurial [hg] - CVS [cvs] - Darcs [darcs] - git [git] - Subversion [svn] - Monotone [mtn] - GNU Arch [gnuarch] - Bazaar [bzr] - Perforce [p4] Accepted destination formats [identifiers]: - Mercurial [hg] - Subversion [svn] (history on branches is not preserved) If no revision is given, all revisions will be converted. Otherwise, convert will only import up to the named revision (given in a format understood by the source). If no destination directory name is specified, it defaults to the basename of the source with "-hg" appended. If the destination repository doesn't exist, it will be created. By default, all sources except Mercurial will use --branchsort. Mercurial uses --sourcesort to preserve original revision numbers order. Sort modes have the following effects: --branchsort convert from parent to child revision when possible, which means branches are usually converted one after the other. It generates more compact repositories. --datesort sort revisions by date. Converted repositories have good- looking changelogs but are often an order of magnitude larger than the same ones generated by --branchsort. --sourcesort try to preserve source revisions order, only supported by Mercurial sources. --closesort try to move closed revisions as close as possible to parent branches, only supported by Mercurial sources. If "REVMAP" isn't given, it will be put in a default location ("<dest>/.hg/shamap" by default). The "REVMAP" is a simple text file that maps each source commit ID to the destination ID for that revision, like so: <source ID> <destination ID> If the file doesn't exist, it's automatically created. It's updated on each commit copied, so 'hg convert' can be interrupted and can be run repeatedly to copy new commits. The authormap is a simple text file that maps each source commit author to a destination commit author. It is handy for source SCMs that use unix logins to identify authors (e.g.: CVS). One line per author mapping and the line format is: source author = destination author Empty lines and lines starting with a "#" are ignored. The filemap is a file that allows filtering and remapping of files and directories. Each line can contain one of the following directives: include path/to/file-or-dir exclude path/to/file-or-dir rename path/to/source path/to/destination Comment lines start with "#". A specified path matches if it equals the full relative name of a file or one of its parent directories. The "include" or "exclude" directive with the longest matching path applies, so line order does not matter. The "include" directive causes a file, or all files under a directory, to be included in the destination repository. The default if there are no "include" statements is to include everything. If there are any "include" statements, nothing else is included. The "exclude" directive causes files or directories to be omitted. The "rename" directive renames a file or directory if it is converted. To rename from a subdirectory into the root of the repository, use "." as the path to rename to. "--full" will make sure the converted changesets contain exactly the right files with the right content. It will make a full conversion of all files, not just the ones that have changed. Files that already are correct will not be changed. This can be used to apply filemap changes when converting incrementally. This is currently only supported for Mercurial and Subversion. The splicemap is a file that allows insertion of synthetic history, letting you specify the parents of a revision. This is useful if you want to e.g. give a Subversion merge two parents, or graft two disconnected series of history together. Each entry contains a key, followed by a space, followed by one or two comma-separated values: key parent1, parent2 The key is the revision ID in the source revision control system whose parents should be modified (same format as a key in .hg/shamap). The values are the revision IDs (in either the source or destination revision control system) that should be used as the new parents for that node. For example, if you have merged "release-1.0" into "trunk", then you should specify the revision on "trunk" as the first parent and the one on the "release-1.0" branch as the second. The branchmap is a file that allows you to rename a branch when it is being brought in from whatever external repository. When used in conjunction with a splicemap, it allows for a powerful combination to help fix even the most badly mismanaged repositories and turn them into nicely structured Mercurial repositories. The branchmap contains lines of the form: original_branch_name new_branch_name where "original_branch_name" is the name of the branch in the source repository, and "new_branch_name" is the name of the branch is the destination repository. No whitespace is allowed in the new branch name. This can be used to (for instance) move code in one repository from "default" to a named branch. Mercurial Source ################ The Mercurial source recognizes the following configuration options, which you can set on the command line with "--config": convert.hg.ignoreerrors ignore integrity errors when reading. Use it to fix Mercurial repositories with missing revlogs, by converting from and to Mercurial. Default is False. convert.hg.saverev store original revision ID in changeset (forces target IDs to change). It takes a boolean argument and defaults to False. convert.hg.startrev specify the initial Mercurial revision. The default is 0. convert.hg.revs revset specifying the source revisions to convert. Bazaar Source ############# The following options can be used with "--config": convert.bzr.saverev whether to store the original Bazaar commit ID in the metadata of the destination commit. The default is True. CVS Source ########## CVS source will use a sandbox (i.e. a checked-out copy) from CVS to indicate the starting point of what will be converted. Direct access to the repository files is not needed, unless of course the repository is ":local:". The conversion uses the top level directory in the sandbox to find the CVS repository, and then uses CVS rlog commands to find files to convert. This means that unless a filemap is given, all files under the starting directory will be converted, and that any directory reorganization in the CVS sandbox is ignored. The following options can be used with "--config": convert.cvsps.cache Set to False to disable remote log caching, for testing and debugging purposes. Default is True. convert.cvsps.fuzz Specify the maximum time (in seconds) that is allowed between commits with identical user and log message in a single changeset. When very large files were checked in as part of a changeset then the default may not be long enough. The default is 60. convert.cvsps.logencoding Specify encoding name to be used for transcoding CVS log messages. Multiple encoding names can be specified as a list (see 'hg help config.Syntax'), but only the first acceptable encoding in the list is used per CVS log entries. This transcoding is executed before cvslog hook below. convert.cvsps.mergeto Specify a regular expression to which commit log messages are matched. If a match occurs, then the conversion process will insert a dummy revision merging the branch on which this log message occurs to the branch indicated in the regex. Default is "{{mergetobranch ([-\w]+)}}" convert.cvsps.mergefrom Specify a regular expression to which commit log messages are matched. If a match occurs, then the conversion process will add the most recent revision on the branch indicated in the regex as the second parent of the changeset. Default is "{{mergefrombranch ([-\w]+)}}" convert.localtimezone use local time (as determined by the TZ environment variable) for changeset date/times. The default is False (use UTC). hooks.cvslog Specify a Python function to be called at the end of gathering the CVS log. The function is passed a list with the log entries, and can modify the entries in-place, or add or delete them. hooks.cvschangesets Specify a Python function to be called after the changesets are calculated from the CVS log. The function is passed a list with the changeset entries, and can modify the changesets in-place, or add or delete them. An additional "debugcvsps" Mercurial command allows the builtin changeset merging code to be run without doing a conversion. Its parameters and output are similar to that of cvsps 2.1. Please see the command help for more details. Subversion Source ################# Subversion source detects classical trunk/branches/tags layouts. By default, the supplied "svn://repo/path/" source URL is converted as a single branch. If "svn://repo/path/trunk" exists it replaces the default branch. If "svn://repo/path/branches" exists, its subdirectories are listed as possible branches. If "svn://repo/path/tags" exists, it is looked for tags referencing converted branches. Default "trunk", "branches" and "tags" values can be overridden with following options. Set them to paths relative to the source URL, or leave them blank to disable auto detection. The following options can be set with "--config": convert.svn.branches specify the directory containing branches. The default is "branches". convert.svn.tags specify the directory containing tags. The default is "tags". convert.svn.trunk specify the name of the trunk branch. The default is "trunk". convert.localtimezone use local time (as determined by the TZ environment variable) for changeset date/times. The default is False (use UTC). Source history can be retrieved starting at a specific revision, instead of being integrally converted. Only single branch conversions are supported. convert.svn.startrev specify start Subversion revision number. The default is 0. Git Source ########## The Git importer converts commits from all reachable branches (refs in refs/heads) and remotes (refs in refs/remotes) to Mercurial. Branches are converted to bookmarks with the same name, with the leading 'refs/heads' stripped. Git submodules are converted to Git subrepos in Mercurial. The following options can be set with "--config": convert.git.similarity specify how similar files modified in a commit must be to be imported as renames or copies, as a percentage between "0" (disabled) and "100" (files must be identical). For example, "90" means that a delete/add pair will be imported as a rename if more than 90% of the file hasn't changed. The default is "50". convert.git.findcopiesharder while detecting copies, look at all files in the working copy instead of just changed ones. This is very expensive for large projects, and is only effective when "convert.git.similarity" is greater than 0. The default is False. convert.git.renamelimit perform rename and copy detection up to this many changed files in a commit. Increasing this will make rename and copy detection more accurate but will significantly slow down computation on large projects. The option is only relevant if "convert.git.similarity" is greater than 0. The default is "400". convert.git.committeractions list of actions to take when processing author and committer values. Git commits have separate author (who wrote the commit) and committer (who applied the commit) fields. Not all destinations support separate author and committer fields (including Mercurial). This config option controls what to do with these author and committer fields during conversion. A value of "messagedifferent" will append a "committer: ..." line to the commit message if the Git committer is different from the author. The prefix of that line can be specified using the syntax "messagedifferent=<prefix>". e.g. "messagedifferent=git-committer:". When a prefix is specified, a space will always be inserted between the prefix and the value. "messagealways" behaves like "messagedifferent" except it will always result in a "committer: ..." line being appended to the commit message. This value is mutually exclusive with "messagedifferent". "dropcommitter" will remove references to the committer. Only references to the author will remain. Actions that add references to the committer will have no effect when this is set. "replaceauthor" will replace the value of the author field with the committer. Other actions that add references to the committer will still take effect when this is set. The default is "messagedifferent". convert.git.extrakeys list of extra keys from commit metadata to copy to the destination. Some Git repositories store extra metadata in commits. By default, this non-default metadata will be lost during conversion. Setting this config option can retain that metadata. Some built-in keys such as "parent" and "branch" are not allowed to be copied. convert.git.remoteprefix remote refs are converted as bookmarks with "convert.git.remoteprefix" as a prefix followed by a /. The default is 'remote'. convert.git.saverev whether to store the original Git commit ID in the metadata of the destination commit. The default is True. convert.git.skipsubmodules does not convert root level .gitmodules files or files with 160000 mode indicating a submodule. Default is False. Perforce Source ############### The Perforce (P4) importer can be given a p4 depot path or a client specification as source. It will convert all files in the source to a flat Mercurial repository, ignoring labels, branches and integrations. Note that when a depot path is given you then usually should specify a target directory, because otherwise the target may be named "...-hg". The following options can be set with "--config": convert.p4.encoding specify the encoding to use when decoding standard output of the Perforce command line tool. The default is default system encoding. convert.p4.startrev specify initial Perforce revision (a Perforce changelist number). Mercurial Destination ##################### The Mercurial destination will recognize Mercurial subrepositories in the destination directory, and update the .hgsubstate file automatically if the destination subrepositories contain the <dest>/<sub>/.hg/shamap file. Converting a repository with subrepositories requires converting a single repository at a time, from the bottom up. The following options are supported: convert.hg.clonebranches dispatch source branches in separate clones. The default is False. convert.hg.tagsbranch branch name for tag revisions, defaults to "default". convert.hg.usebranchnames preserve branch names. The default is True. convert.hg.sourcename records the given string as a 'convert_source' extra value on each commit made in the target repository. The default is None. All Destinations ################ All destination types accept the following options: convert.skiptags does not convert tags from the source repo to the target repo. The default is False. options ([+] can be repeated): -s --source-type TYPE source repository type -d --dest-type TYPE destination repository type -r --rev REV [+] import up to source revision REV -A --authormap FILE remap usernames using this file --filemap FILE remap file names using contents of file --full apply filemap changes by converting all files again --splicemap FILE splice synthesized history into place --branchmap FILE change branch names while converting --branchsort try to sort changesets by branches --datesort try to sort changesets by date --sourcesort preserve source changesets order --closesort try to reorder closed revisions (some details hidden, use --verbose to show complete help) $ hg init a $ cd a $ echo a > a $ hg ci -d'0 0' -Ama adding a $ hg cp a b $ hg ci -d'1 0' -mb $ hg rm a $ hg ci -d'2 0' -mc $ hg mv b a $ hg ci -d'3 0' -md $ echo a >> a $ hg ci -d'4 0' -me $ cd .. $ hg convert a 2>&1 | grep -v 'subversion python bindings could not be loaded' assuming destination a-hg initializing destination a-hg repository scanning source... sorting... converting... 4 a 3 b 2 c 1 d 0 e $ hg --cwd a-hg pull ../a pulling from ../a searching for changes no changes found 5 local changesets published conversion to existing file should fail $ touch bogusfile $ hg convert a bogusfile initializing destination bogusfile repository abort: cannot create new bundle repository [255] #if unix-permissions no-root conversion to dir without permissions should fail $ mkdir bogusdir $ chmod 000 bogusdir $ hg convert a bogusdir abort: Permission denied: *bogusdir* (glob) [255] user permissions should succeed $ chmod 700 bogusdir $ hg convert a bogusdir initializing destination bogusdir repository scanning source... sorting... converting... 4 a 3 b 2 c 1 d 0 e #endif test pre and post conversion actions $ echo 'include b' > filemap $ hg convert --debug --filemap filemap a partialb | \ > grep 'run hg' run hg source pre-conversion action run hg sink pre-conversion action run hg sink post-conversion action run hg source post-conversion action converting empty dir should fail "nicely $ mkdir emptydir override $PATH to ensure p4 not visible; use $PYTHON in case we're running from a devel copy, not a temp installation $ PATH="$BINDIR" "$PYTHON" "$BINDIR"/hg convert emptydir assuming destination emptydir-hg initializing destination emptydir-hg repository emptydir does not look like a CVS checkout $TESTTMP/emptydir does not look like a Git repository emptydir does not look like a Subversion repository emptydir is not a local Mercurial repository emptydir does not look like a darcs repository emptydir does not look like a monotone repository emptydir does not look like a GNU Arch repository emptydir does not look like a Bazaar repository cannot find required "p4" tool abort: emptydir: missing or unsupported repository [255] convert with imaginary source type $ hg convert --source-type foo a a-foo initializing destination a-foo repository abort: foo: invalid source repository type [255] convert with imaginary sink type $ hg convert --dest-type foo a a-foo abort: foo: invalid destination repository type [255] testing: convert must not produce duplicate entries in fncache $ hg convert a b initializing destination b repository scanning source... sorting... converting... 4 a 3 b 2 c 1 d 0 e contents of fncache file: #if repofncache $ cat b/.hg/store/fncache | sort data/a.i (reporevlogstore !) data/b.i (reporevlogstore !) #endif test bogus URL #if no-msys $ hg convert -q bzr+ssh://foobar@selenic.com/baz baz abort: bzr+ssh://foobar@selenic.com/baz: missing or unsupported repository [255] #endif test revset converted() lookup $ hg --config convert.hg.saverev=True convert a c initializing destination c repository scanning source... sorting... converting... 4 a 3 b 2 c 1 d 0 e $ echo f > c/f $ hg -R c ci -d'0 0' -Amf adding f created new head $ hg -R c log -r "converted(09d945a62ce6)" changeset: 1:98c3dd46a874 user: test date: Thu Jan 01 00:00:01 1970 +0000 summary: b $ hg -R c log -r "converted()" changeset: 0:31ed57b2037c user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: a changeset: 1:98c3dd46a874 user: test date: Thu Jan 01 00:00:01 1970 +0000 summary: b changeset: 2:3b9ca06ef716 user: test date: Thu Jan 01 00:00:02 1970 +0000 summary: c changeset: 3:4e0debd37cf2 user: test date: Thu Jan 01 00:00:03 1970 +0000 summary: d changeset: 4:9de3bc9349c5 user: test date: Thu Jan 01 00:00:04 1970 +0000 summary: e test specifying a sourcename $ echo g > a/g $ hg -R a ci -d'0 0' -Amg adding g $ hg --config convert.hg.sourcename=mysource --config convert.hg.saverev=True convert a c scanning source... sorting... converting... 0 g $ hg -R c log -r tip --template '{extras % "{extra}\n"}' branch=default convert_revision=a3bc6100aa8ec03e00aaf271f1f50046fb432072 convert_source=mysource $ cat > branchmap.txt << EOF > old branch new_branch > EOF $ hg -R a branch -q 'old branch' $ echo gg > a/g $ hg -R a ci -m 'branch name with spaces' $ hg convert --branchmap branchmap.txt a d initializing destination d repository scanning source... sorting... converting... 6 a 5 b 4 c 3 d 2 e 1 g 0 branch name with spaces $ hg -R a branches old branch 6:a24a66ade009 default 5:a3bc6100aa8e (inactive) $ hg -R d branches new_branch 6:64ed208b732b default 5:a3bc6100aa8e (inactive)