benchmarks.md



Benchmarks
Some benchmarks, run on an ancient Thinkpad running Intel Core 2 Duo at 2GHz.
|Implementation     |  Time (sec)|
|-------------------|-----------:|
| Markdown.pl       | 2921.24    |
| Python markdown   |  291.25    |
| PHP markdown      |   20.82    |
| kramdown          |   17.32    |
| cheapskate        |    8.24    |
| peg-markdown      |    5.45    |
| parsedown         |    5.06    |
| commonmark.js |    2.09    |
| marked            |    1.93    |
| discount          |    1.86    |
| cmark         |    0.37    |
| sundown           |    0.34    |
To run these benchmarks, use make bench PROG=/path/to/program.
The input text is a 11MB Markdown file built by concatenating the
Markdown sources of all the localizations of the first edition of
Pro Git by Scott Chacon.
time is used to measure execution speed.  The reported
time is the difference between the time to run the program
with the benchmark input and the time to run it with no input.
(This procedure ensures that implementations in dynamic languages are
not penalized by startup time.) Amedian of ten runs is taken.  The
process is reniced to a high priority so that the system doesn't
interrupt runs.
JavaScript libraries
Here are some focused benchmarks of four JavaScript libraries
(using versions available on 17 Jan 2015). They test performance
on different kinds of Markdown texts.  With the exception of
the first (the README.md from this project), the samples are taken
from the markdown-it
repository.  Results show a ratio of ops/second (higher is better)
against the slowest implementation (always showdown).
| Sample                 |showdown  |commonmark|marked    |markdown-it|
|------------------------|---------:|---------:|---------:|----------:|
|README.md               |         1|       3.2|       3.1|        4.4|
|block-bq-flat.md        |         1|       8.0|      12.8|       11.3|
|block-bq-nested.md      |         1|      10.8|       9.9|       12.6|
|block-code.md           |         1|      24.9|      58.4|       83.2|
|block-fences.md         |         1|      16.4|      66.5|       65.5|
|block-heading.md        |         1|      10.7|      11.0|       17.5|
|block-hr.md             |         1|      14.4|      14.6|       37.7|
|block-html.md           |         1|       7.9|       2.8|       14.8|
|block-lheading.md       |         1|      14.4|      17.7|       26.1|
|block-list-flat.md      |         1|       4.3|       4.3|       10.4|
|block-list-nested.md    |         1|       7.4|       5.7|       19.1|
|block-ref-flat.md       |         1|       1.8|       1.1|        1.5|
|block-ref-nested.md     |         1|       1.5|       1.4|        2.4|
|inline-autolink.md      |         1|       4.1|       7.0|        4.5|
|inline-backticks.md     |         1|      15.8|      13.7|       30.7|
|inline-em-flat.md       |         1|       4.1|       3.8|        8.7|
|inline-em-nested.md     |         1|       5.2|       4.6|        8.3|
|inline-em-worst.md      |         1|       5.3|       4.9|        3.4|
|inline-entity.md        |         1|       4.8|       9.7|        7.7|
|inline-escape.md        |         1|       4.6|       2.9|       12.4|
|inline-html.md          |         1|       3.6|       5.2|        5.0|
|inline-links-flat.md    |         1|       3.7|       4.0|        4.1|
|inline-links-nested.md  |         1|       3.8|       1.0|        1.5|
|inline-newlines.md      |         1|       6.9|       6.5|       13.1|
|rawtabs.md              |         1|       8.9|       9.7|       13.4|
To run these:

npm install marked showdown markdown-it
Create a samples subdirectory and copy the samples you
want to test into it.
sh tools/detailed_benchmarks.sh