Re: Moving documentation to XML

Hello, Peter.

I've managed to speed up html generation from xml (make xslthtml) from
32 min. (in my environment) to 4 min. by modifying slowest XSL templates.
All my modifications incorporated in a single file
stylesheet-xhtml-speedup.xsl, which is included in stylesheet.xsl.
I performed optimization by analyzing output of:
xsltproc --profile --stringparam pg.version '9.6devel' stylesheet.xsl
postgres.xml
Initial statistics:
number               match                name      mode Calls Tot 100us Avg

     0             appendix label.markup
23090 90677526   3927
     1              chapter label.markup
28870 39740757   1376
     2 chunk-all-sections             1289 23845066  18498
     3                     make.legalnotice.head.links
2578 9630258   3735
     4            indexterm reference   2579 4126513   1600
     5 html.head             1289 3112534   2414
...
index % time    self  children    called     name
                 0.479 1326.034     22/23090     toc.line [61]
                 5.128 1308.245  21944/23090 sect1[label.markup] [13]
                 3.772 1318.264    850/23090 substitute-markup [15]
                 1.355 1304.631    274/23090
figure|table|example[label.markup] [32]
[0]    47.95  906.775    1.613  23090 appendix[label.markup] [0]
                 1.613    0.000  23090/23090 autolabel.format [29]
-----------------------------------------------
                 5.128 1308.245  24708/28870 sect1[label.markup] [13]
                 0.479 1326.034    130/28870     toc.line [61]
                 3.772 1318.264   2112/28870 substitute-markup [15]
                 1.355 1304.631   1920/28870
figure|table|example[label.markup] [32]
[1]    21.01  397.408    1.613  28870 chapter[label.markup] [1]
                 1.613    0.000  28870/28870 autolabel.format [29]
-----------------------------------------------
                 0.164  238.606   1289/1289 process-chunk-element [98]
[2]    12.61  238.451    0.225   1289 chunk-all-sections [2]
                 0.225    7.117   1289/1289 process-chunk [86]
-----------------------------------------------
                31.125  112.261   1289/2578      html.head [5]
                96.303   96.726   1289/2578 make.legalnotice.head.links [3]
[3]     5.09   96.303   96.726   2578 make.legalnotice.head.links [3]
                96.303   96.726   1289/3867 make.legalnotice.head.links [3]
                 0.339    0.494   1289/3867
*[object.title.markup.textonly] [69]
                 0.085    0.781   1289/3867 ln.or.rh.filename [116]

-----------------------------------------------


Currrent statistics:
number               match                name      mode Calls Tot 100us Avg

     0 chunk-all-sections             1289 5405958   4193
     1                     make.legalnotice.head.links
                                                            1289
3159538   2451
     2 html.head             1289 3068417   2380
     3                         gentext.template 689835 2327761      3
     4                            l10n.language 564453 1455253      2
     5 href.target            29881 1344063     44
---
index % time    self  children    called     name
                 0.136   54.207   1289/1289 process-chunk-element [95]
[0]    20.40   54.060    0.312   1289 chunk-all-sections [0]
                 0.312    6.468   1289/1289 process-chunk [67]
-----------------------------------------------
                30.684   45.458   1289/1289      html.head [2]
[1]    11.92   31.595    0.448   1289 make.legalnotice.head.links [1]
                 0.290    0.403   1289/2578
*[object.title.markup.textonly] [71]
                 0.159    0.828   1289/2578 ln.or.rh.filename [91]
-----------------------------------------------
                 0.330   31.617   1289/1289 chunk-element-content [65]
[2]    11.58   30.684   45.458   1289     html.head [2]
                31.595    0.448   1289/15462 make.legalnotice.head.links [1]
                13.441    4.726   5153/15462 href.target [5]
                 0.290    0.403   5153/15462
*[object.title.markup.textonly] [71]
                 0.115    1.576   1289/15462 head.content [99]
                 0.012    0.000   1289/15462 system.head.content [186]
                 0.006    0.000   1289/15462 user.head.content [228]

To make sure that result of the transformation is the same, I've
compared original .html's with .html's generated with modified templates.
Unfortunately xslt generates random id's, so it's needed to exclude them
before comparing. I do that with:
for f in */*.html; do sed -e
's/id=\"\(ftn\.\)\?id[a-z][0-9]\+\"/id=\"id\"/g' -i $f ; sed -e
's/href=\"[^#]*#\(ftn\.\)\?id[a-z][0-9]\+\"/href=\"#\"/g' -i $f; done


So if it's acceptable way to speed up generation of HTML (and maybe some
other formats), what other steps should we take to move away from SGML?
If the performance is still not satisfying, please let me know, I'll
continue to optimize xslt.
Beside performance issues, I can see some difference in results of 'make
html' and 'make xslthtml'. For example, see doc/src/sgml/html/spi.html
(xslt-generated version doesn't contain the lists of functions).

Best regards,
Alexander



06.04.2015 23:02, Peter Eisentraut wrote:
> On 4/2/15 5:22 PM, Luzanov Pavel wrote:
>> Peter,
>>
>>
>> I found this message in archives:
>>
>> http://www.postgresql.org/message-id/flat/519C3D99.9000304@gmx.net#519C3D99.9000304@gmx.net
>>
>>
>> and, as you recommend, tested a speed of building docs on a fresh Ubuntu
>> installation.
>>
>> 50sec for make html
>> and 14min 50sec for make xslthtml
>> 17 times slower!
>>
>>
>> Is it still a main stopper for moving to XML?
> Yes :)
>
>
>