view tests/test-convert-svn-move.t @ 16120:47ee41fcf42b

largefiles: optimize update speed by only updating changed largefiles

Historically, during 'hg update', every largefile in the working copy was
hashed (which is a very expensive operation on big files) and any
largefiles that did not have a hash that matched their standin were
updated.

This patch optimizes 'hg update' by keeping track of what standins have
changed between the old and new revisions, and only updating the largefiles
that have changed.  This saves a lot of time by avoiding the unecessary
calculation of a list of sha1 hashes for big files.

With this patch, the time 'hg update' takes to complete is a function of
how many largefiles need to be updated and what their size is.

Performance tests on a repository with about 80 largefiles ranging from
a few MB to about 97 MB are shown below.  The tests show how long it takes
to run 'hg update' with no changes actually being updated.

Mercurial 2.1 release:

$ time hg update
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
getting changed largefiles
0 largefiles updated, 0 removed

real    0m10.045s
user    0m9.367s
sys    0m0.674s

With this patch:

$ time hg update
0 files updated, 0 files merged, 0 files removed, 0 files unresolved

real    0m0.965s
user    0m0.845s
sys    0m0.115s

The same repsoitory, without the largefiles extension enabled:

$ time hg update
0 files updated, 0 files merged, 0 files removed, 0 files unresolved

real    0m0.799s
user    0m0.684s
sys    0m0.111s

So before the patch, 'hg update' with no changes was approximately 9.25s
slower with largefiles enabled.  With this patch, it is approximately 0.165s
slower.

  $ "$TESTDIR/hghave" svn svn-bindings || exit 80

  $ fixpath()
  > {
  >     tr '\\' /
  > }
  $ cat >> $HGRCPATH <<EOF
  > [extensions]
  > convert = 
  > graphlog =
  > EOF

  $ svnadmin create svn-repo
  $ svnadmin load -q svn-repo < "$TESTDIR/svn/move.svndump"
  $ svnpath=`pwd | fixpath`

SVN wants all paths to start with a slash. Unfortunately,
Windows ones don't. Handle that.

  $ expr "$svnpath" : "\/" > /dev/null
  > if [ $? -ne 0 ]; then
  >   svnpath="/$svnpath"
  > fi
  > svnurl="file://$svnpath/svn-repo"

Convert trunk and branches

  $ hg convert --datesort "$svnurl"/subproject A-hg
  initializing destination A-hg repository
  scanning source...
  sorting...
  converting...
  13 createtrunk
  12 moved1
  11 moved1
  10 moved2
  9 changeb and rm d2
  8 changeb and rm d2
  7 moved1again
  6 moved1again
  5 copyfilefrompast
  4 copydirfrompast
  3 add d3
  2 copy dir and remove subdir
  1 add d4old
  0 rename d4old into d4new

  $ cd A-hg
  $ hg glog --template '{rev} {desc|firstline} files: {files}\n'
  o  13 rename d4old into d4new files: d4new/g d4old/g
  |
  o  12 add d4old files: d4old/g
  |
  o  11 copy dir and remove subdir files: d3/d31/e d4/d31/e d4/f
  |
  o  10 add d3 files: d3/d31/e d3/f
  |
  o  9 copydirfrompast files: d2/d
  |
  o  8 copyfilefrompast files: d
  |
  o  7 moved1again files: d1/b d1/c
  |
  | o  6 moved1again files:
  | |
  o |  5 changeb and rm d2 files: d1/b d2/d
  | |
  | o  4 changeb and rm d2 files: b
  | |
  o |  3 moved2 files: d2/d
  | |
  o |  2 moved1 files: d1/b d1/c
  | |
  | o  1 moved1 files: b c
  |
  o  0 createtrunk files:
  

Check move copy records

  $ hg st --rev 12:13 --copies
  A d4new/g
    d4old/g
  R d4old/g

Check branches

  $ hg branches
  default                       13:* (glob)
  d1                             6:* (glob)
  $ cd ..

  $ mkdir test-replace
  $ cd test-replace
  $ svnadmin create svn-repo
  $ svnadmin load -q svn-repo < "$TESTDIR/svn/replace.svndump"

Convert files being replaced by directories

  $ hg convert svn-repo hg-repo
  initializing destination hg-repo repository
  scanning source...
  sorting...
  converting...
  6 initial
  5 clobber symlink
  4 clobber1
  3 clobber2
  2 adddb
  1 branch
  0 clobberdir

  $ cd hg-repo

Manifest before

  $ hg -v manifest -r 1
  644   a
  644   d/b
  644   d2/a
  644 @ dlink
  644 @ dlink2
  644   dlink3

Manifest after clobber1

  $ hg -v manifest -r 2
  644   a/b
  644   d/b
  644   d2/a
  644   dlink/b
  644 @ dlink2
  644   dlink3

Manifest after clobber2

  $ hg -v manifest -r 3
  644   a/b
  644   d/b
  644   d2/a
  644   dlink/b
  644 @ dlink2
  644 @ dlink3

Manifest after clobberdir

  $ hg -v manifest -r 6
  644   a/b
  644   d/b
  644   d2/a
  644   d2/c
  644   dlink/b
  644 @ dlink2
  644 @ dlink3

Try updating

  $ hg up -qC default
  $ cd ..

Test convert progress bar'

  $ cat >> $HGRCPATH <<EOF
  > [extensions]
  > progress = 
  > [progress]
  > assume-tty = 1
  > delay = 0
  > changedelay = 0
  > format = topic bar number
  > refresh = 0
  > width = 60
  > EOF

  $ hg convert svn-repo hg-progress 2>&1 | $TESTDIR/filtercr.py
  
  scanning [ <=>                                          ] 1
  scanning [  <=>                                         ] 2
  scanning [   <=>                                        ] 3
  scanning [    <=>                                       ] 4
  scanning [     <=>                                      ] 5
  scanning [      <=>                                     ] 6
  scanning [       <=>                                    ] 7
                                                              
  converting [                                          ] 0/7
  getting files [=====>                                 ] 1/6
  getting files [============>                          ] 2/6
  getting files [==================>                    ] 3/6
  getting files [=========================>             ] 4/6
  getting files [===============================>       ] 5/6
  getting files [======================================>] 6/6
                                                              
  converting [=====>                                    ] 1/7
  scanning paths [                                      ] 0/1
  getting files [======================================>] 1/1
                                                              
  converting [===========>                              ] 2/7
  scanning paths [                                      ] 0/2
  scanning paths [==================>                   ] 1/2
  getting files [========>                              ] 1/4
  getting files [==================>                    ] 2/4
  getting files [============================>          ] 3/4
  getting files [======================================>] 4/4
                                                              
  converting [=================>                        ] 3/7
  scanning paths [                                      ] 0/1
  getting files [======================================>] 1/1
                                                              
  converting [=======================>                  ] 4/7
  scanning paths [                                      ] 0/1
  getting files [======================================>] 1/1
                                                              
  converting [=============================>            ] 5/7
  scanning paths [                                      ] 0/3
  scanning paths [===========>                          ] 1/3
  scanning paths [========================>             ] 2/3
  getting files [===>                                   ] 1/8
  getting files [========>                              ] 2/8
  getting files [=============>                         ] 3/8
  getting files [==================>                    ] 4/8
  getting files [=======================>               ] 5/8
  getting files [============================>          ] 6/8
  getting files [=================================>     ] 7/8
  getting files [======================================>] 8/8
                                                              
  converting [===================================>      ] 6/7
  scanning paths [                                      ] 0/1
  getting files [===>                                   ] 1/8
  getting files [========>                              ] 2/8
  getting files [=============>                         ] 3/8
  getting files [==================>                    ] 4/8
  getting files [=======================>               ] 5/8
  getting files [============================>          ] 6/8
  getting files [=================================>     ] 7/8
  getting files [======================================>] 8/8
                                                              
  initializing destination hg-progress repository
  scanning source...
  sorting...
  converting...
  6 initial
  5 clobber symlink
  4 clobber1
  3 clobber2
  2 adddb
  1 branch
  0 clobberdir