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JSON module performance comparison under Lua
============================================
Mark Pulford <mark@kyne.com.au>
:revdate: January 22, 2012
This performance comparison aims to provide a guide of relative
performance between several fast and popular JSON modules.
The examples used in this comparison were mostly sourced from the
http://json.org[JSON website] and
http://tools.ietf.org/html/rfc4627[RFC 4627].
Performance will vary widely between platforms and data sets. These
results should only be used as an approximation.
Modules
-------
The following JSON modules for Lua were tested:
http://chiselapp.com/user/dhkolf/repository/dkjson/[DKJSON 2.1]::
- Lua implementation with no dependencies on other libraries
- Supports LPeg to improve decode performance
https://github.com/brimworks/lua-yajl[Lua YAJL 2.0]::
- C wrapper for the YAJL library
http://www.kyne.com.au/%7Emark/software/lua-cjson.php[Lua CJSON 2.0.0]::
- C implementation with no dependencies on other libraries
Summary
-------
All modules were built and tested as follows:
DKJSON:: Tested with/without LPeg 10.2.
Lua YAJL:: Tested with YAJL 2.0.4.
Lua CJSON:: Tested with Libc and internal floating point conversion
routines.
The following Lua implementations were used for this comparison:
- http://www.lua.org[Lua 5.1.4] (_Lua_)
- http://www.luajit.org[LuaJIT 2.0.0-beta9] (_JIT_)
These results show the number of JSON operations per second sustained by
each module. All results have been normalised against the pure Lua
DKJSON implementation.
.Decoding performance
............................................................................
| DKJSON | Lua YAJL | Lua CJSON
| No LPeg With LPeg | | Libc Internal
| Lua JIT Lua JIT | Lua JIT | Lua JIT Lua JIT
example1 | 1x 2x 2.6x 3.4x | 7.1x 10x | 14x 20x 14x 20x
example2 | 1x 2.2x 2.9x 4.4x | 6.7x 9.9x | 14x 22x 14x 22x
example3 | 1x 2.1x 3x 4.3x | 6.9x 9.3x | 14x 21x 15x 22x
example4 | 1x 2x 2.5x 3.7x | 7.3x 10x | 12x 19x 12x 20x
example5 | 1x 2.2x 3x 4.5x | 7.8x 11x | 16x 24x 16x 24x
numbers | 1x 2.2x 2.3x 4x | 4.6x 5.5x | 8.9x 10x 13x 17x
rfc-example1 | 1x 2.1x 2.8x 4.3x | 6.1x 8.1x | 13x 19x 14x 21x
rfc-example2 | 1x 2.1x 3.1x 4.2x | 7.1x 9.2x | 15x 21x 17x 24x
types | 1x 2.2x 2.6x 4.3x | 5.3x 7.4x | 12x 20x 13x 21x
-------------|-------------------------|------------|-----------------------
= Average => | 1x 2.1x 2.7x 4.1x | 6.5x 9x | 13x 20x 14x 21x
............................................................................
.Encoding performance
.............................................................................
| DKJSON | Lua YAJL | Lua CJSON
| No LPeg With LPeg | | Libc Internal
| Lua JIT Lua JIT | Lua JIT | Lua JIT Lua JIT
example1 | 1x 1.8x 0.97x 1.6x | 3.1x 5.2x | 23x 29x 23x 29x
example2 | 1x 2x 0.97x 1.7x | 2.6x 4.3x | 22x 28x 22x 28x
example3 | 1x 1.9x 0.98x 1.6x | 2.8x 4.3x | 13x 15x 16x 18x
example4 | 1x 1.7x 0.96x 1.3x | 3.9x 6.1x | 15x 19x 17x 21x
example5 | 1x 2x 0.98x 1.7x | 2.7x 4.5x | 20x 23x 20x 23x
numbers | 1x 2.3x 1x 2.2x | 1.3x 1.9x | 3.8x 4.1x 4.2x 4.6x
rfc-example1 | 1x 1.9x 0.97x 1.6x | 2.2x 3.2x | 8.5x 9.3x 11x 12x
rfc-example2 | 1x 1.9x 0.98x 1.6x | 2.6x 3.9x | 10x 11x 17x 19x
types | 1x 2.2x 0.97x 2x | 1.2x 1.9x | 11x 13x 12x 14x
-------------|-------------------------|------------|-----------------------
= Average => | 1x 1.9x 0.98x 1.7x | 2.5x 3.9x | 14x 17x 16x 19x
.............................................................................
// vi:ft=asciidoc tw=72:
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