Històrics i rèpliques amb git¶

Aquesta pàgina és purament un quadern de notes; si no enteneu gaire de què va, cap problema (FerranJorba)

• [http://thread.gmane.org/gmane.comp.version-control.git/70612 I don't want the .git directory next to my code], (http://news.gmane.org/gmane.comp.version%2dcontrol.git, 2008-01-16)

• /mnt/CLARIION/ és un volum muntat via NFS en un Clariion Celerra

• /mnt/VOLUM-I/ és un volum iSCSI SataBeast

11-feb-2008

$ git --version

git version 1.5.5.GIT

$ pwd

/mnt/CLARIION/ddd

$ export GIT_DIR=/mnt/VOLUM-I/1-01/ddd/ddd-docs.git

$ git init

Initialized empty Git repository in /mnt/VOLUM-I/1-01/ddd/ddd-docs.git

$ git add pub/ariel/ariel_a1951m1n21.info

fatal: This operation must be run in a work tree

$ export GIT_WORK_TREE=$PWD

$ git add pub/ariel/ariel_a1951m1n21.info

$ git status

# On branch master

#

# Initial commit

#

# Changes to be committed:

#   (use "git rm --cached <file>..." to unstage)

#

#       new file: pub/ariel/ariel_a1951m1n21.info

#

$ time git commit -m "Initial commit with a sample journal (Ariel)" 

$ set | grep GIT >git.README

$ cat git.README 

GIT_DIR=/mnt/VOLUM-I/1-01/ddd/ddd-docs.git

GIT_WORK_TREE=/mnt/CLARIION/ddd

$ du -hs uab

15G     uab

$ du -hs pub

60G     pub

$ time git add uab

2 h (aprox).

$ time git commit -m "Add uab/" 

[...]

 create mode 100644 uab/pubmat/02141493v49n2p351.png

 create mode 100644 uab/pubmat/02141493v49n2p363.info

 create mode 100644 uab/pubmat/02141493v49n2p363.pdf

 create mode 100644 uab/pubmat/02141493v49n2p363.png

[...]

real    7m56.954s

user    0m18.609s

sys     0m41.211s

$ time git add pub/        

[...]

error: open("pub/guies/2008-09/prova/sedQPO0P4"): Permission denied

fatal: unable to index file pub/guies/2008-09/prova/sedQPO0P4

real    38m51.920s

user    24m32.840s

sys     2m36.362s

$ rm -rf pub/guies/2008-09/prova/

$ time git add pub 

error: readlink("pub/redes-vell/html-vol8/cover.png"): No such file or directory

fatal: unable to index file pub/redes-vell/html-vol8/cover.png

real    127m4.635s

user    82m19.817s

sys     7m31.012s

$ ls -l pub/redes-vell/html-vol8/cover.png

lrwxrwxrwx 1 ddd users 64 Dec  2 16:47 pub/redes-vell/html-vol8/cover.png -> an?lisis de redes sociales mediante diagramas estructurales.png

$ rm pub/redes-vell/html-vol8/cover.png

$ time git add pub 

real    92m41.896s

user    47m43.651s

sys     3m33.265s

$ time git commit -m "Add pub/ (60 GB)" 

Created commit e8fbc22: Add pub/ (60 GB)

[...]

 create mode 100644 pub/virolet/a1926m5d22n229.pdf

 create mode 100644 pub/virolet/a1926m5d22n229.png

 create mode 100644 pub/virolet/a1926m5d29n230.info

 create mode 100644 pub/virolet/a1926m5d29n230.pdf

 create mode 100644 pub/virolet/a1926m5d29n230.png

[...]

real    9m34.080s

user    0m32.898s

sys     0m31.926s

$ date; time git fsck; date

Fri Feb 13 13:10:25 CET 2009

dangling blob b80060892154649dd815882397faf4ca2138bf9e

dangling blob e80c002edbca7759b239885502cc456215c652bc

dangling blob 560e586176aba8d733c52b6f7389aa9619203cf7

dangling blob e214983717f3b2bdf78abf2ceb5d3ba9957fc342

[...]

dangling blob 4ba69f45849c3d0b71cdaebc5af15d11039781fc

dangling blob 8bbaff6754c0248c9617777c832b67b0b84c68af

dangling blob f7e90f9b31478fdff6f85ca479b134c092644000

dangling blob 0bf747922da7539ed0b7e384ef28601ecc5ebbd1

real    121m52.941s

user    42m25.515s

sys     3m24.445s

Fri Feb 13 15:12:18 CET 2009

$ date; time git count-objects; date

Mon Feb 16 09:27:59 CET 2009

143692 objects, 71828560 kilobytes

real    2m2.457s

user    0m0.088s

sys     0m1.700s

Mon Feb 16 09:30:02 CET 2009

$ du -hs

69G     .

$ date; time git gc; du -hs; date

Mon Feb 16 09:33:07 CET 2009

Counting objects: 143557, done.

Compressing objects: 100% (141209/141209), done.

Writing objects: 100% (143557/143557), done.

Total 143557 (delta 44795), reused 0 (delta 0)

Removing duplicate objects: 100% (256/256), done.

real    688m22.913s

user    522m33.703s

sys     23m16.447s

68G     .

Mon Feb 16 21:01:31 CET 2009

$ du -hs

68G     .

$ date; time git fsck; date

Tue Feb 17 09:09:52 CET 2009

dangling blob b80060892154649dd815882397faf4ca2138bf9e

dangling blob e80c002edbca7759b239885502cc456215c652bc

dangling blob 560e586176aba8d733c52b6f7389aa9619203cf7

[...]

dangling blob 4ba69f45849c3d0b71cdaebc5af15d11039781fc

dangling blob 8bbaff6754c0248c9617777c832b67b0b84c68af

dangling blob f7e90f9b31478fdff6f85ca479b134c092644000

dangling blob 0bf747922da7539ed0b7e384ef28601ecc5ebbd1

real    0m2.886s

user    0m1.064s

sys     0m0.080s

Tue Feb 17 09:09:55 CET 2009

$ time git status

[...]

#       uab/procur/2008-09/p28041a2008-09g12mTiCAT.pdf

#       uab/procur/2008-09/p28041a2008-09g12mTiCAT.png

#       uab/procur/2008-09/p28058a2007-08mTiCAT.info

#       uab/procur/2008-09/p28058a2007-08mTiCAT.pdf

#       uab/procur/2008-09/p28058a2007-08mTiCAT.png

no changes added to commit (use "git add" and/or "git commit -a")

real    1m20.441s

user    0m22.765s

sys     0m6.644s

$ date; time git gc; du -hs; date

Tue Feb 17 09:26:00 CET 2009

Counting objects: 143557, done.

Counting objects: 143557, done.

Compressing objects: 100% (96414/96414), done.

Writing objects: 100% (143557/143557), done.

Total 143557 (delta 44795), reused 143557 (delta 44795)

real    95m31.468s

user    37m18.860s

sys     9m47.377s

68G     .

Tue Feb 17 11:01:32 CET 2009

$ time git fsck

[...]

fc

dangling blob 8bbaff6754c0248c9617777c832b67b0b84c68af

dangling blob f7e90f9b31478fdff6f85ca479b134c092644000

dangling blob 0bf747922da7539ed0b7e384ef28601ecc5ebbd1

real    0m1.527s

user    0m1.036s

sys     0m0.076s

$ time git prune

real    0m2.794s

user    0m1.004s

sys     0m0.076s

Rendiment amb git (antic)¶

 ddd@morera:/mnt/VOLUM-I/2-10/marca$ time git init-db

 defaulting to local storage area

 real    0m0.104s

 user    0m0.000s

 sys     0m0.004s

 ddd@morera:/mnt/VOLUM-I/2-10/marca$ time git add .

 real    2071m11.567s

 user    1699m21.444s

 sys     78m3.685s

 ddd@morera:/mnt/VOLUM-I/2-10/marca$ time git commit

*** Environment problem:

*** Your [[[[name]]]] cannot be determined from your system services (gecos).

*** You would need to set GIT_AUTHOR_NAME and GIT_COMMITTER_NAME

*** environment variables; otherwise you won't be able to perform

*** certain operations because of "empty ident" errors.

*** Alternatively, you can use user.[[[[name]]]] configuration variable.

 fatal: empty ident  <ddd@morera.uab.es> not allowed

 real    0m8.884s

 user    0m1.016s

 sys     0m0.724s

 ddd@morera:/mnt/VOLUM-I/2-10/marca$ export GIT_AUTHOR_NAME=Ferran.Jorba@uab.cat

 ddd@morera:/mnt/VOLUM-I/2-10/marca$ export GIT_COMMITTER_NAME=Ferran.Jorba@uab.cat

 ddd@morera:/mnt/VOLUM-I/2-10/marca$ time git commit

 [...]

 [Surt l'editor amb un text com ara aquest:

  # Please enter the commit message for your changes.

  # (Comment lines starting with '#' will not be included)

  #

  # Initial commit

  #

  # Updated but not checked in:

  #   (will commit)

  #

  #       new file: BCHG-Marca-1/Ariel/Correccions/07_08_1846_003_004.info

  #       new file: BCHG-Marca-1/Ariel/Correccions/07_08_1846_003_004.pdf

  #       new file: BCHG-Marca-1/Ariel/Correccions/07_08_1947_011.info

  #       new file: BCHG-Marca-1/Ariel/Correccions/07_08_1947_011.pdf

  #       new file: BCHG-Marca-1/Ariel/Correccions/11_12_1946_007_008.info

  #       new file: BCHG-Marca-1/Ariel/Correccions/11_12_1946_007_008.pdf

  #       new file: BCHG-Marca-1/Ariel/Correccions/11_12_1947_013.info

  #       new file: BCHG-Marca-1/Ariel/Correccions/11_12_1947_013.pdf

  #       new file: BCHG-Marca-1/Ariel/Pdf/01_1951_021.info

  ...

 Hi afegeixo a dalt de tot: Primer commit amb Git, i surto]

 Committing initial tree 2479889df3287fba828a48c12cf0b81fa1e08fbd

 real    1m25.382s

 user    0m1.800s

 sys     0m1.616s

En resum:

• 505 GB en 34 hores

• 15 GB per hora

• 1 GB en 4 minuts

• Git crea el directori .git (ocult) i ocupa 357.6 GB (un 70% del tamany original). És a dir, que gestionar-ho amb git representa un overhead del 70% en espai de disc.

Proves de git amb git i linux-kernel¶

 ddd@morera:/mnt/VOLUM-I/2-10/proves-git/git$ time git clone git://git.kernel.org/pub/scm/git/git.git

 remote: Counting objects: 72402, done.

 remote: Compressing objects: 100% (19633/19633), done.

 Indexing 72402 objects.

 remote: Total 72402 (delta 51879), reused 71831 (delta 51441)

  100% (72402/72402) done

 Resolving 51879 deltas.

  100% (51879/51879) done

 Checking files out...

  100% (1246/1246) done

 real    0m28.992s

 user    0m22.529s

 sys     0m1.068s

 ddd@morera:/mnt/VOLUM-I/2-10/proves-git/linux-kernel$ time git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git

 remote: Counting objects: 723252, done.

 remote: Compressing objects: 100% (128603/128603), done.

 Indexing 723252 objects.

 remote: Total 723252 (delta 600335), reused 716266 (delta 593654)

  100% (723252/723252) done

 Resolving 600335 deltas.

  100% (600335/600335) done

 Checking files out...

  100% (23787/23787) done

 real    5m11.887s

 user    3m54.487s

 sys     0m12.673s

Rendiment amb mercurial¶

 ddd@morera:/mnt/VOLUM-I/2-09/marca$ time hg init

 real    0m6.770s

 user    0m0.156s

 sys     0m0.032s

 $ time hg commit

 nothing changed

 real    0m3.921s

 user    0m1.296s

 sys     0m0.592s

 $ time hg add

 [...]

 pdf-repaginats/La nova revista/1928/a1928m08n20.pdf: files over 10MB may cause memory and performance problems

 (use 'hg revert pdf-repaginats/La nova revista/1928/a1928m08n20.pdf' to unadd the file)

 pdf-repaginats/La nova revista/1928/a1928m09n21.pdf: files over 10MB may cause memory and performance problems

 (use 'hg revert pdf-repaginats/La nova revista/1928/a1928m09n21.pdf' to unadd the file)

 [...]

 pdf-repaginats/La Esfera/1916/Num 143_setembre.pdf: files over 10MB may cause memory and performance problems

 (use 'hg revert pdf-repaginats/La Esfera/1916/Num 143_setembre.pdf' to unadd the file)

 pdf-repaginats/La Esfera/1916/Num 144_setembre.pdf: files over 10MB may cause memory and performance problems

 (use 'hg revert pdf-repaginats/La Esfera/1916/Num 144_setembre.pdf' to unadd the file)

 [...]

 pdf-repaginats/Vic/1936/1936.pdf: files over 10MB may cause memory and performance problems

 (use 'hg revert pdf-repaginats/Vic/1936/1936.pdf' to unadd the file)

 real    0m7.309s

 user    0m3.580s

 sys     0m0.928s

 $ time hg commit

 [...]

 [Surt l'editor amb un text com ara aquest:

  HG: user: ddd@morera.uab.es

  HG: branch default

  HG: changed BCHG-Marca-1/Ariel/Correccions/07_08_1846_003_004.info

  HG: changed BCHG-Marca-1/Ariel/Correccions/07_08_1846_003_004.pdf

  HG: changed BCHG-Marca-1/Ariel/Correccions/07_08_1947_011.info

  HG: changed BCHG-Marca-1/Ariel/Correccions/07_08_1947_011.pdf

  HG: changed BCHG-Marca-1/Ariel/Correccions/11_12_1946_007_008.info

  HG: changed BCHG-Marca-1/Ariel/Correccions/11_12_1946_007_008.pdf

  HG: changed BCHG-Marca-1/Ariel/Correccions/11_12_1947_013.info

  HG: changed BCHG-Marca-1/Ariel/Correccions/11_12_1947_013.pdf

  ...

 Hi afegeixo a dalt de tot: Primer commit amb Mercurial, i surto]

 real    2517m29.572s

 user    1811m55.538s

 sys     205m16.658s

En resum:

• 505 GB en 41 hores (quasi tot en el commit; però no sé quan em es va obrir l'editor)

• x GB per hora

• 1 GB en x minuts

• Mercurial crea el directori .hg (ocult) i ocupa 362.6 GB (un 71% del tamany original). És a dir, que gestionar-ho amb Mercurial representa un overhead del 71% en espai de disc.