[PATCH 4 of 5] debugformat: add information about sparse-revlog
Boris Feld
boris.feld at octobus.net
Mon Jul 16 14:50:24 EDT 2018
# HG changeset patch
# User Paul Morelle <paul.morelle at octobus.net>
# Date 1529584381 -7200
# Thu Jun 21 14:33:01 2018 +0200
# Node ID 35a23148fd05821bc620673e8217cbdb400f4412
# Parent c34ef3def14e04dca76c43667766496a99636b44
# EXP-Topic write-for-sparse-read
# Available At https://bitbucket.org/octobus/mercurial-devel/
# hg pull https://bitbucket.org/octobus/mercurial-devel/ -r 35a23148fd05
debugformat: add information about sparse-revlog
Show information about sparse-revlog in debugformat, just like other
requirements.
diff --git a/mercurial/upgrade.py b/mercurial/upgrade.py
--- a/mercurial/upgrade.py
+++ b/mercurial/upgrade.py
@@ -259,6 +259,28 @@ class generaldelta(requirementformatvari
'faster')
@registerformatvariant
+class sparserevlog(requirementformatvariant):
+ name = 'sparserevlog'
+
+ _requirement = localrepo.SPARSEREVLOG_REQUIREMENT
+
+ default = False
+
+ description = _('in order to limit disk reading and memory usage on older '
+ 'version, the span of a delta chain from its root to its '
+ 'end is limited, whatever the relevant data in this span. '
+ 'This can severly limit Mercurial ability to build good '
+ 'chain of delta resulting is much more storage space being '
+ 'taken and limit reusability of on disk delta during '
+ 'exchange.'
+ )
+
+ upgrademessage = _('Revlog supports delta chain with more unused data '
+ 'between payload. These gaps will be skipped at read '
+ 'time. This allows for better delta chains, making a '
+ 'better compression and faster exchange with server.')
+
+ at registerformatvariant
class removecldeltachain(formatvariant):
name = 'plain-cl-delta'
diff --git a/tests/test-upgrade-repo.t b/tests/test-upgrade-repo.t
--- a/tests/test-upgrade-repo.t
+++ b/tests/test-upgrade-repo.t
@@ -56,6 +56,7 @@ An upgrade of a repository created with
fncache: yes
dotencode: yes
generaldelta: yes
+ sparserevlog: no
plain-cl-delta: yes
compression: zlib
$ hg debugformat --verbose
@@ -63,6 +64,7 @@ An upgrade of a repository created with
fncache: yes yes yes
dotencode: yes yes yes
generaldelta: yes yes yes
+ sparserevlog: no no no
plain-cl-delta: yes yes yes
compression: zlib zlib zlib
$ hg debugformat --verbose --config format.usegfncache=no
@@ -70,6 +72,7 @@ An upgrade of a repository created with
fncache: yes yes yes
dotencode: yes yes yes
generaldelta: yes yes yes
+ sparserevlog: no no no
plain-cl-delta: yes yes yes
compression: zlib zlib zlib
$ hg debugformat --verbose --config format.usegfncache=no --color=debug
@@ -77,6 +80,7 @@ An upgrade of a repository created with
[formatvariant.name.uptodate|fncache: ][formatvariant.repo.uptodate| yes][formatvariant.config.default| yes][formatvariant.default| yes]
[formatvariant.name.uptodate|dotencode: ][formatvariant.repo.uptodate| yes][formatvariant.config.default| yes][formatvariant.default| yes]
[formatvariant.name.uptodate|generaldelta: ][formatvariant.repo.uptodate| yes][formatvariant.config.default| yes][formatvariant.default| yes]
+ [formatvariant.name.uptodate|sparserevlog: ][formatvariant.repo.uptodate| no][formatvariant.config.default| no][formatvariant.default| no]
[formatvariant.name.uptodate|plain-cl-delta:][formatvariant.repo.uptodate| yes][formatvariant.config.default| yes][formatvariant.default| yes]
[formatvariant.name.uptodate|compression: ][formatvariant.repo.uptodate| zlib][formatvariant.config.default| zlib][formatvariant.default| zlib]
$ hg debugformat -Tjson
@@ -100,6 +104,12 @@ An upgrade of a repository created with
"repo": true
},
{
+ "config": false,
+ "default": false,
+ "name": "sparserevlog",
+ "repo": false
+ },
+ {
"config": true,
"default": true,
"name": "plain-cl-delta",
@@ -119,6 +129,9 @@ An upgrade of a repository created with
requirements
preserved: dotencode, fncache, generaldelta, revlogv1, store
+ sparserevlog
+ Revlog supports delta chain with more unused data between payload. These gaps will be skipped at read time. This allows for better delta chains, making a better compression and faster exchange with server.
+
additional optimizations are available by specifying "--optimize <name>":
redeltaparent
@@ -143,6 +156,9 @@ An upgrade of a repository created with
requirements
preserved: dotencode, fncache, generaldelta, revlogv1, store
+ sparserevlog
+ Revlog supports delta chain with more unused data between payload. These gaps will be skipped at read time. This allows for better delta chains, making a better compression and faster exchange with server.
+
redeltaparent
deltas within internal storage will choose a new base revision if needed
@@ -170,6 +186,7 @@ Various sub-optimal detections work
fncache: no
dotencode: no
generaldelta: no
+ sparserevlog: no
plain-cl-delta: yes
compression: zlib
$ hg debugformat --verbose
@@ -177,6 +194,7 @@ Various sub-optimal detections work
fncache: no yes yes
dotencode: no yes yes
generaldelta: no yes yes
+ sparserevlog: no no no
plain-cl-delta: yes yes yes
compression: zlib zlib zlib
$ hg debugformat --verbose --config format.usegeneraldelta=no
@@ -184,6 +202,7 @@ Various sub-optimal detections work
fncache: no yes yes
dotencode: no yes yes
generaldelta: no no yes
+ sparserevlog: no no no
plain-cl-delta: yes yes yes
compression: zlib zlib zlib
$ hg debugformat --verbose --config format.usegeneraldelta=no --color=debug
@@ -191,6 +210,7 @@ Various sub-optimal detections work
[formatvariant.name.mismatchconfig|fncache: ][formatvariant.repo.mismatchconfig| no][formatvariant.config.default| yes][formatvariant.default| yes]
[formatvariant.name.mismatchconfig|dotencode: ][formatvariant.repo.mismatchconfig| no][formatvariant.config.default| yes][formatvariant.default| yes]
[formatvariant.name.mismatchdefault|generaldelta: ][formatvariant.repo.mismatchdefault| no][formatvariant.config.special| no][formatvariant.default| yes]
+ [formatvariant.name.uptodate|sparserevlog: ][formatvariant.repo.uptodate| no][formatvariant.config.default| no][formatvariant.default| no]
[formatvariant.name.uptodate|plain-cl-delta:][formatvariant.repo.uptodate| yes][formatvariant.config.default| yes][formatvariant.default| yes]
[formatvariant.name.uptodate|compression: ][formatvariant.repo.uptodate| zlib][formatvariant.config.default| zlib][formatvariant.default| zlib]
$ hg debugupgraderepo
@@ -221,6 +241,9 @@ Various sub-optimal detections work
generaldelta
repository storage will be able to create optimal deltas; new repository data will be smaller and read times should decrease; interacting with other repositories using this storage model should require less network and CPU resources, making "hg push" and "hg pull" faster
+ sparserevlog
+ Revlog supports delta chain with more unused data between payload. These gaps will be skipped at read time. This allows for better delta chains, making a better compression and faster exchange with server.
+
additional optimizations are available by specifying "--optimize <name>":
redeltaparent
@@ -263,6 +286,9 @@ Various sub-optimal detections work
generaldelta
repository storage will be able to create optimal deltas; new repository data will be smaller and read times should decrease; interacting with other repositories using this storage model should require less network and CPU resources, making "hg push" and "hg pull" faster
+ sparserevlog
+ Revlog supports delta chain with more unused data between payload. These gaps will be skipped at read time. This allows for better delta chains, making a better compression and faster exchange with server.
+
additional optimizations are available by specifying "--optimize <name>":
redeltaparent
@@ -289,6 +315,9 @@ Upgrading a repository that is already m
requirements
preserved: dotencode, fncache, generaldelta, revlogv1, store
+ sparserevlog
+ Revlog supports delta chain with more unused data between payload. These gaps will be skipped at read time. This allows for better delta chains, making a better compression and faster exchange with server.
+
beginning upgrade...
repository locked and read-only
creating temporary repository to stage migrated data: $TESTTMP/modern/.hg/upgrade.* (glob)
@@ -326,6 +355,9 @@ Upgrading a repository to generaldelta w
generaldelta
repository storage will be able to create optimal deltas; new repository data will be smaller and read times should decrease; interacting with other repositories using this storage model should require less network and CPU resources, making "hg push" and "hg pull" faster
+ sparserevlog
+ Revlog supports delta chain with more unused data between payload. These gaps will be skipped at read time. This allows for better delta chains, making a better compression and faster exchange with server.
+
beginning upgrade...
repository locked and read-only
creating temporary repository to stage migrated data: $TESTTMP/upgradegd/.hg/upgrade.* (glob)
@@ -423,6 +455,9 @@ store files with special filenames aren'
requirements
preserved: dotencode, fncache, generaldelta, revlogv1, store
+ sparserevlog
+ Revlog supports delta chain with more unused data between payload. These gaps will be skipped at read time. This allows for better delta chains, making a better compression and faster exchange with server.
+
beginning upgrade...
repository locked and read-only
creating temporary repository to stage migrated data: $TESTTMP/store-filenames/.hg/upgrade.* (glob)
@@ -454,6 +489,9 @@ store files with special filenames aren'
requirements
preserved: dotencode, fncache, generaldelta, revlogv1, store
+ sparserevlog
+ Revlog supports delta chain with more unused data between payload. These gaps will be skipped at read time. This allows for better delta chains, making a better compression and faster exchange with server.
+
redeltafulladd
each revision will be added as new content to the internal storage; this will likely drastically slow down execution time, but some extensions might need it
@@ -512,6 +550,9 @@ Check upgrading a large file repository
requirements
preserved: dotencode, fncache, generaldelta, largefiles, revlogv1, store
+ sparserevlog
+ Revlog supports delta chain with more unused data between payload. These gaps will be skipped at read time. This allows for better delta chains, making a better compression and faster exchange with server.
+
beginning upgrade...
repository locked and read-only
creating temporary repository to stage migrated data: $TESTTMP/largefilesrepo/.hg/upgrade.* (glob)
@@ -564,6 +605,9 @@ Check upgrading a large file repository
requirements
preserved: dotencode, fncache, generaldelta, largefiles, lfs, revlogv1, store
+ sparserevlog
+ Revlog supports delta chain with more unused data between payload. These gaps will be skipped at read time. This allows for better delta chains, making a better compression and faster exchange with server.
+
beginning upgrade...
repository locked and read-only
creating temporary repository to stage migrated data: $TESTTMP/largefilesrepo/.hg/upgrade.* (glob)
@@ -659,6 +703,9 @@ repository config is taken in account
requirements
preserved: dotencode, fncache, generaldelta, revlogv1, store
+ sparserevlog
+ Revlog supports delta chain with more unused data between payload. These gaps will be skipped at read time. This allows for better delta chains, making a better compression and faster exchange with server.
+
redeltaall
deltas within internal storage will be fully recomputed; this will likely drastically slow down execution time
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