view tests/test-minirst.py.out @ 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

== paragraphs ==
60 column format:
----------------------------------------------------------------------
This is some text in the first paragraph.

  A small indented paragraph. It is followed by some lines
  containing random whitespace.

The third and final paragraph.
----------------------------------------------------------------------

30 column format:
----------------------------------------------------------------------
This is some text in the first
paragraph.

  A small indented paragraph.
  It is followed by some lines
  containing random
  whitespace.

The third and final paragraph.
----------------------------------------------------------------------

html format:
----------------------------------------------------------------------
<p>
This is some text in the first paragraph.
</p>
<p>
A small indented paragraph.
It is followed by some lines
containing random whitespace.
</p>
<p>
The third and final paragraph.
</p>
----------------------------------------------------------------------

== definitions ==
60 column format:
----------------------------------------------------------------------
A Term
  Definition. The indented lines make up the definition.

Another Term
    Another definition. The final line in the definition
    determines the indentation, so this will be indented
    with four spaces.

  A Nested/Indented Term
    Definition.
----------------------------------------------------------------------

30 column format:
----------------------------------------------------------------------
A Term
  Definition. The indented
  lines make up the
  definition.

Another Term
    Another definition. The
    final line in the
    definition determines the
    indentation, so this will
    be indented with four
    spaces.

  A Nested/Indented Term
    Definition.
----------------------------------------------------------------------

html format:
----------------------------------------------------------------------
<dl>
 <dt>A Term
 <dd>Definition. The indented lines make up the definition.
 <dt>Another Term
 <dd>Another definition. The final line in the definition determines the indentation, so this will be indented with four spaces.
 <dt>A Nested/Indented Term
 <dd>Definition.
</dl>
----------------------------------------------------------------------

== literals ==
60 column format:
----------------------------------------------------------------------
The fully minimized form is the most convenient form:

  Hello
    literal
      world

In the partially minimized form a paragraph simply ends with
space-double-colon.

  ////////////////////////////////////////
  long un-wrapped line in a literal block
  \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\

  This literal block is started with '::',
    the so-called expanded form. The paragraph
      with '::' disappears in the final output.
----------------------------------------------------------------------

30 column format:
----------------------------------------------------------------------
The fully minimized form is
the most convenient form:

  Hello
    literal
      world

In the partially minimized
form a paragraph simply ends
with space-double-colon.

  ////////////////////////////////////////
  long un-wrapped line in a literal block
  \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\

  This literal block is started with '::',
    the so-called expanded form. The paragraph
      with '::' disappears in the final output.
----------------------------------------------------------------------

html format:
----------------------------------------------------------------------
<p>
The fully minimized form is the most
convenient form:
</p>
<pre>
Hello
  literal
    world
</pre>
<p>
In the partially minimized form a paragraph
simply ends with space-double-colon.
</p>
<pre>
////////////////////////////////////////
long un-wrapped line in a literal block
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
</pre>
<pre>
This literal block is started with '::',
  the so-called expanded form. The paragraph
    with '::' disappears in the final output.
</pre>
----------------------------------------------------------------------

== lists ==
60 column format:
----------------------------------------------------------------------
- This is the first list item.

  Second paragraph in the first list item.

- List items need not be separated by a blank line.
- And will be rendered without one in any case.

We can have indented lists:

  - This is an indented list item
  - Another indented list item:

      - A literal block in the middle
            of an indented list.

      (The above is not a list item since we are in the literal block.)

  Literal block with no indentation (apart from
  the two spaces added to all literal blocks).

1. This is an enumerated list (first item).
2. Continuing with the second item.
(1) foo
(2) bar
1) Another
2) List

Line blocks are also a form of list:

This is the first line. The line continues here.
This is the second line.

Bullet lists are also detected:

* This is the first bullet
* This is the second bullet It has 2 lines
* This is the third bullet
----------------------------------------------------------------------

30 column format:
----------------------------------------------------------------------
- This is the first list item.

  Second paragraph in the
  first list item.

- List items need not be
  separated by a blank line.
- And will be rendered without
  one in any case.

We can have indented lists:

  - This is an indented list
    item
  - Another indented list
    item:

      - A literal block in the middle
            of an indented list.

      (The above is not a list item since we are in the literal block.)

  Literal block with no indentation (apart from
  the two spaces added to all literal blocks).

1. This is an enumerated list
   (first item).
2. Continuing with the second
   item.
(1) foo
(2) bar
1) Another
2) List

Line blocks are also a form of
list:

This is the first line. The
line continues here.
This is the second line.

Bullet lists are also
detected:

* This is the first bullet
* This is the second bullet It
  has 2 lines
* This is the third bullet
----------------------------------------------------------------------

html format:
----------------------------------------------------------------------
<ul>
 <li> This is the first list item.
<p>
Second paragraph in the first list item.
</p>
 <li> List items need not be separated   by a blank line.
 <li> And will be rendered without   one in any case.
</ul>
<p>
We can have indented lists:
</p>
<ul>
 <li> This is an indented list item
 <li> Another indented list item:
<pre>
- A literal block in the middle
      of an indented list.
</pre>
<pre>
(The above is not a list item since we are in the literal block.)
</pre>
</ul>
<pre>
Literal block with no indentation (apart from
the two spaces added to all literal blocks).
</pre>
<ol>
 <li> This is an enumerated list (first item).
 <li> Continuing with the second item.
 <li> foo
 <li> bar
 <li> Another
 <li> List
</ol>
<p>
Line blocks are also a form of list:
</p>
<ol>
 <li> This is the first line.   The line continues here.
 <li> This is the second line.
</ol>
<p>
Bullet lists are also detected:
</p>
<ul>
 <li> This is the first bullet
 <li> This is the second bullet   It has 2 lines
 <li> This is the third bullet
</ul>
----------------------------------------------------------------------

== options ==
60 column format:
----------------------------------------------------------------------
There is support for simple option lists, but only with long
options:

 -X --exclude filter  an option with a short and long option
                      with an argument
 -I --include         an option with both a short option and
                      a long option
    --all             Output all.
    --both            Output both (this description is quite
                      long).
    --long            Output all day long.
    --par             This option has two paragraphs in its
                      description. This is the first.

                      This is the second.  Blank lines may
                      be omitted between options (as above)
                      or left in (as here).

The next paragraph looks like an option list, but lacks the
two-space marker after the option. It is treated as a normal
paragraph:

--foo bar baz
----------------------------------------------------------------------

30 column format:
----------------------------------------------------------------------
There is support for simple
option lists, but only with
long options:

 -X --exclude filter  an
                      option
                      with a
                      short
                      and
                      long
                      option
                      with an
                      argumen
                      t
 -I --include         an
                      option
                      with
                      both a
                      short
                      option
                      and a
                      long
                      option
    --all             Output
                      all.
    --both            Output
                      both
                      (this d
                      escript
                      ion is
                      quite
                      long).
    --long            Output
                      all day
                      long.
    --par             This
                      option
                      has two
                      paragra
                      phs in
                      its des
                      criptio
                      n. This
                      is the
                      first.

                      This is
                      the
                      second.
                      Blank
                      lines
                      may be
                      omitted
                      between
                      options
                      (as
                      above)
                      or left
                      in (as
                      here).

The next paragraph looks like
an option list, but lacks the
two-space marker after the
option. It is treated as a
normal paragraph:

--foo bar baz
----------------------------------------------------------------------

html format:
----------------------------------------------------------------------
<p>
There is support for simple option lists,
but only with long options:
</p>
<dl>
 <dt>-X --exclude filter
 <dd>an option with a short and long option with an argument
 <dt>-I --include
 <dd>an option with both a short option and a long option
 <dt>   --all
 <dd>Output all.
 <dt>   --both
 <dd>Output both (this description is quite long).
 <dt>   --long
 <dd>Output all day long.
 <dt>   --par
 <dd>This option has two paragraphs in its description. This is the first.
<p>
This is the second.  Blank lines may be omitted between
options (as above) or left in (as here).
</p>
</dl>
<p>
The next paragraph looks like an option list, but lacks the two-space
marker after the option. It is treated as a normal paragraph:
</p>
<p>
--foo bar baz
</p>
----------------------------------------------------------------------

== fields ==
60 column format:
----------------------------------------------------------------------
a             First item.
ab            Second item. Indentation and wrapping is
              handled automatically.

Next list:

small         The larger key below triggers full indentation
              here.
much too large
              This key is big enough to get its own line.
----------------------------------------------------------------------

30 column format:
----------------------------------------------------------------------
a             First item.
ab            Second item.
              Indentation and
              wrapping is
              handled
              automatically.

Next list:

small         The larger key
              below triggers
              full indentation
              here.
much too large
              This key is big
              enough to get
              its own line.
----------------------------------------------------------------------

html format:
----------------------------------------------------------------------
<dl>
 <dt>a
 <dd>First item.
 <dt>ab
 <dd>Second item. Indentation and wrapping is handled automatically.
</dl>
<p>
Next list:
</p>
<dl>
 <dt>small
 <dd>The larger key below triggers full indentation here.
 <dt>much too large
 <dd>This key is big enough to get its own line.
</dl>
----------------------------------------------------------------------

== containers (normal) ==
60 column format:
----------------------------------------------------------------------
Normal output.
----------------------------------------------------------------------

30 column format:
----------------------------------------------------------------------
Normal output.
----------------------------------------------------------------------

html format:
----------------------------------------------------------------------
<p>
Normal output.
</p>
----------------------------------------------------------------------

== containers (verbose) ==
60 column format:
----------------------------------------------------------------------
Normal output.

Verbose output.
----------------------------------------------------------------------
['debug', 'debug']
----------------------------------------------------------------------

30 column format:
----------------------------------------------------------------------
Normal output.

Verbose output.
----------------------------------------------------------------------
['debug', 'debug']
----------------------------------------------------------------------

html format:
----------------------------------------------------------------------
<p>
Normal output.
</p>
<p>
Verbose output.
</p>
----------------------------------------------------------------------
['debug', 'debug']
----------------------------------------------------------------------

== containers (debug) ==
60 column format:
----------------------------------------------------------------------
Normal output.

Initial debug output.
----------------------------------------------------------------------
['verbose']
----------------------------------------------------------------------

30 column format:
----------------------------------------------------------------------
Normal output.

Initial debug output.
----------------------------------------------------------------------
['verbose']
----------------------------------------------------------------------

html format:
----------------------------------------------------------------------
<p>
Normal output.
</p>
<p>
Initial debug output.
</p>
----------------------------------------------------------------------
['verbose']
----------------------------------------------------------------------

== containers (verbose debug) ==
60 column format:
----------------------------------------------------------------------
Normal output.

Initial debug output.

Verbose output.

Debug output.
----------------------------------------------------------------------
[]
----------------------------------------------------------------------

30 column format:
----------------------------------------------------------------------
Normal output.

Initial debug output.

Verbose output.

Debug output.
----------------------------------------------------------------------
[]
----------------------------------------------------------------------

html format:
----------------------------------------------------------------------
<p>
Normal output.
</p>
<p>
Initial debug output.
</p>
<p>
Verbose output.
</p>
<p>
Debug output.
</p>
----------------------------------------------------------------------
[]
----------------------------------------------------------------------

== roles ==
60 column format:
----------------------------------------------------------------------
Please see 'hg add'.
----------------------------------------------------------------------

30 column format:
----------------------------------------------------------------------
Please see 'hg add'.
----------------------------------------------------------------------

html format:
----------------------------------------------------------------------
<p>
Please see 'hg add'.
</p>
----------------------------------------------------------------------

== sections ==
60 column format:
----------------------------------------------------------------------
Title
=====

Section
-------

Subsection
''''''''''

Markup: "foo" and 'hg help'
---------------------------
----------------------------------------------------------------------

30 column format:
----------------------------------------------------------------------
Title
=====

Section
-------

Subsection
''''''''''

Markup: "foo" and 'hg help'
---------------------------
----------------------------------------------------------------------

html format:
----------------------------------------------------------------------
<h1>Title</h1>
<h2>Section</h2>
<h3>Subsection</h3>
<h2>Markup: &quot;foo&quot; and 'hg help'</h2>
----------------------------------------------------------------------

== admonitions ==
60 column format:
----------------------------------------------------------------------
Note:
   This is a note

   - Bullet 1
   - Bullet 2

   Warning!
      This is a warning Second input line of warning

!Danger!
   This is danger
----------------------------------------------------------------------

30 column format:
----------------------------------------------------------------------
Note:
   This is a note

   - Bullet 1
   - Bullet 2

   Warning!
      This is a warning Second
      input line of warning

!Danger!
   This is danger
----------------------------------------------------------------------

html format:
----------------------------------------------------------------------
<p>
<b>Note:</b> 
</p>
<p>
This is a note
</p>
<ul>
 <li> Bullet 1
 <li> Bullet 2
</ul>
<p>
<b>Warning!</b> This is a warning Second input line of warning
</p>
<p>
<b>!Danger!</b> This is danger
</p>
----------------------------------------------------------------------

== comments ==
60 column format:
----------------------------------------------------------------------
Some text.

   Some indented text.

Empty comment above
----------------------------------------------------------------------

30 column format:
----------------------------------------------------------------------
Some text.

   Some indented text.

Empty comment above
----------------------------------------------------------------------

html format:
----------------------------------------------------------------------
<p>
Some text.
</p>
<p>
Some indented text.
</p>
<p>
Empty comment above
</p>
----------------------------------------------------------------------

  === === ========================================
  a   b   c                                       
  === === ========================================
  1   2   3                                       
  foo bar baz this list is very very very long man
  === === ========================================

== table ==
60 column format:
----------------------------------------------------------------------
  a   b   c
  ------------------------------------------------
  1   2   3
  foo bar baz this list is very very very long man
----------------------------------------------------------------------

30 column format:
----------------------------------------------------------------------
  a   b   c
  ------------------------------
  1   2   3
  foo bar baz this list is
          very very very long
          man
----------------------------------------------------------------------

html format:
----------------------------------------------------------------------
<table>
<tr><td>a</td>
<td>b</td>
<td>c</td></tr>
<tr><td>1</td>
<td>2</td>
<td>3</td></tr>
<tr><td>foo</td>
<td>bar</td>
<td>baz this list is very very very long man</td></tr>
</table>
----------------------------------------------------------------------

 = ==== ======================================
 s long line goes on here                     
   xy   tried to fix here by indenting        
 = ==== ======================================

== table+nl ==
60 column format:
----------------------------------------------------------------------
 s long line goes on here
   xy   tried to fix here by indenting
----------------------------------------------------------------------

30 column format:
----------------------------------------------------------------------
 s long line goes on here
   xy   tried to fix here by
        indenting
----------------------------------------------------------------------

html format:
----------------------------------------------------------------------
<table>
<tr><td>s</td>
<td>long</td>
<td>line goes on here</td></tr>
<tr><td></td>
<td>xy</td>
<td>tried to fix here by indenting</td></tr>
</table>
----------------------------------------------------------------------