Subversion vs. Git: Debunking Myths About Debunking Myths
Subversion vs. Git: Myths and Facts claims to dispel some myths about version control systems. I doubted their “facts” and checked some of them. The result of the test was the undermined authority of the site, and skepticism about the rest of the statements.
Below is an example where they compare the size of the repository. Conclusion - the difference is not significant.
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I was embarrassed by a different number of commits, and in fact different primary sources (who knows how they synchronize these repositories there). Also, I was not satisfied with the level of detail describing the process of obtaining these numbers.
So let's start our experiment!
svn. 213 , 79758 88 .
39864 . 1701 160 .
, ( 32 ). git — svn ( , ).
, , .
, git_from_svn/.git: 208 7841 509 . git, , . 2 : “loose” object “packfile".
, :
:
6826 (30.21 ) .
:
".git" 136 (945 , 255 ). .
, svn — bare : 106 M, 19 , 8 .
( ).
, loose , . , . .
«».
– . , 0,01 . - svn, . , ( svn checkout). , .
TotalSeconds: 14.0737539
TotalSeconds: 21.8173709
Git . , git , svn — .
TotalSeconds: 4.3741352
TotalSeconds: 1.2700857
, .
. .
PS: , « », , , , .
!
Update:
VBKesha , svnadmin pack.
214 MB (4,644 Files, 89 Folders)
, .
A little about why it interested me
I relatively recently changed jobs, got into a company that uses svn, but the transition to git often pops up in discussions.
Once I witnessed a discussion of this topic. Colleagues discussed the same site and came to the conclusion that "we change the awl for soap."
In this dialogue, I was an unwitting listener, but what was there for the site and its arguments interested me. I went to understand.
Once I witnessed a discussion of this topic. Colleagues discussed the same site and came to the conclusion that "we change the awl for soap."
In this dialogue, I was an unwitting listener, but what was there for the site and its arguments interested me. I went to understand.
Let's start with the first statement
Git repositories are significantly smaller than equivalent Subversion ones
False. A myth.
There are several ways to complete the data. Subversion and Git repositories with data. Subversion repositories couldn’t be much smaller than the git ones.
Below is an example where they compare the size of the repository. Conclusion - the difference is not significant.
')
I was embarrassed by a different number of commits, and in fact different primary sources (who knows how they synchronize these repositories there). Also, I was not satisfied with the level of detail describing the process of obtaining these numbers.
So let's start our experiment!
Get svn repository
svnrdump.exe dump https://core.svn.wordpress.org/ > svndump
svnadmin create svn
svnadmin load svn < svndump svn. 213 , 79758 88 .
39864 . 1701 160 .
git svn clone -s --prefix "svn/" file:///%path%/svn git_from_svn , ( 32 ). git — svn ( , ).
, , .
, git_from_svn/.git: 208 7841 509 . git, , . 2 : “loose” object “packfile".
, :
git count-objects -v -H:
count: 6826
size: 30.21 MiB
in-pack: 249852
packs: 25
size-pack: 145.51 MiB
prune-packable: 73
garbage: 0
size-garbage: 0 bytes
6826 (30.21 ) .
git gc
git count-objects -v -H:
count: 0
size: 0 bytes
in-pack: 256605
packs: 1
size-pack: 104.54 MiB
prune-packable: 0
garbage: 0
size-garbage: 0 bytes
".git" 136 (945 , 255 ). .
, svn — bare : 106 M, 19 , 8 .
svn — 213 M (79 758 , 88 )
svn( pack) — 214 M (4 644 , 89 ) ( )
git svn — 208 M (7 841 , 509 )
git svn(pack) — 136 M (945 , 255 )
git bare(pack) — 106 M (19 , 8 )
( ).
, loose , . , . .
Branches are expensive in Subversion
False. A myth.
Branches in Subversion are implemented with Copy-On-Write strategy (referred to as ‘Cheap Copies’ in the svnbook). No matter how large a repository or project is, it takes a constant amount of time and space to make a branch. In fact, Subversion branches are extremely cheap beginning with version 1.0 and you can branch even for small bugfixes in a very busy and large project.
«».
– . , 0,01 . - svn, . , ( svn checkout). , .
–
svn checkout %local_path%/trunkTotalSeconds: 14.0737539
git clone %local_path%TotalSeconds: 21.8173709
Git . , git , svn — .
–
svn switch <local_path>/branches/4.7TotalSeconds: 4.3741352
git checkout -B "4.7" "origin/4.7"TotalSeconds: 1.2700857
, .
. .
PS: , « », , , , .
!
Update:
VBKesha , svnadmin pack.
svnadmin.exe pack svn214 MB (4,644 Files, 89 Folders)
, .
Source: https://habr.com/ru/post/320704/
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