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Pure Ruby MessagePack decoding speed

For fun I'm writing a MessagePack encoder/decoder in pure Ruby to see how close to the speed of the native C and Java implementations I can get. Currently it's just 20% slower than the native C extension for decoding (haven't implemented encoding yet), and twice as slow as native Java, when running in the latest Java 1.7.

Below are some benchmarks run in both MRI and JRuby, comparing the native decoders for both platforms with my pure Ruby implementation with and without InvokeDynamic in JRuby.

The MessagePack decoder code is here: https://github.com/iconara/msgpack-pure-ruby/blob/647bcf74f8b059e5e31cc620f81eeb39b73393a4/lib/msgpack.rb

The benchmark code is here: https://github.com/iconara/msgpack-pure-ruby/blob/647bcf74f8b059e5e31cc620f81eeb39b73393a4/spec/benchmark.rb

The benchmark outputs start with the output of java -version and then runs a series of benchmarks with one million repetitions of decoding the same chunk of bytes. The lines beginning with * show the Ruby version used and additional info.

All of the tests were run in OS X 10.8.4.

java version "1.6.0_51"
Java(TM) SE Runtime Environment (build 1.6.0_51-b11-457-11M4509)
Java HotSpot(TM) 64-Bit Server VM (build 20.51-b01-457, mixed mode)
* jruby-1.7.4 native java msgpack
Rehearsal ----------------------------------------------
msgpack 7.150000 0.220000 7.370000 ( 6.993000)
------------------------------------- total: 7.370000sec
user system total real
msgpack 6.800000 0.200000 7.000000 ( 6.761000)
========================================================
* jruby-1.7.4 pure ruby msgpack
Rehearsal ----------------------------------------------
msgpack 20.360000 0.180000 20.540000 ( 20.166000)
------------------------------------ total: 20.540000sec
user system total real
msgpack 20.210000 0.170000 20.380000 ( 20.203000)
========================================================
java version "1.7.0_40"
Java(TM) SE Runtime Environment (build 1.7.0_40-b40)
Java HotSpot(TM) 64-Bit Server VM (build 24.0-b55, mixed mode)
* jruby-1.7.4 native java msgpack
Rehearsal ----------------------------------------------
msgpack 6.080000 0.160000 6.240000 ( 3.626000)
------------------------------------- total: 6.240000sec
user system total real
msgpack 2.270000 0.020000 2.290000 ( 2.244000)
========================================================
* jruby-1.7.4 pure ruby msgpack with -Xcompile.invokedynamic=true
Rehearsal ----------------------------------------------
msgpack 11.080000 0.170000 11.250000 ( 8.310000)
------------------------------------ total: 11.250000sec
user system total real
msgpack 5.980000 0.040000 6.020000 ( 5.946000)
========================================================
* jruby-1.7.4 pure ruby msgpack with -X+C -J-XX:+TieredCompilation -Xcompile.invokedynamic=true
Rehearsal ----------------------------------------------
msgpack 9.250000 0.190000 9.440000 ( 6.353000)
------------------------------------- total: 9.440000sec
user system total real
msgpack 5.270000 0.030000 5.300000 ( 5.183000)
========================================================
* jruby-1.7.4 pure ruby msgpack with -Xcompile.invokedynamic=false
Rehearsal ----------------------------------------------
msgpack 9.300000 0.140000 9.440000 ( 7.576000)
------------------------------------- total: 9.440000sec
user system total real
msgpack 6.550000 0.020000 6.570000 ( 6.477000)
========================================================
* jruby-head (9422f547) pure ruby msgpack with -X+C -J-XX:+TieredCompilation -Xcompile.invokedynamic=true
Rehearsal ----------------------------------------------
msgpack 9.600000 0.200000 9.800000 ( 6.186000)
------------------------------------- total: 9.800000sec
user system total real
msgpack 4.690000 0.020000 4.710000 ( 4.597000)
========================================================
* jruby-head (9422f547) pure ruby msgpack with -Xcompile.invokedynamic=false
Rehearsal ----------------------------------------------
msgpack 9.910000 0.150000 10.060000 ( 8.050000)
------------------------------------ total: 10.060000sec
user system total real
msgpack 7.110000 0.020000 7.130000 ( 7.047000)
========================================================
* ruby-2.0.0-p195 native msgpack
Rehearsal ----------------------------------------------
msgpack 3.930000 0.220000 4.150000 ( 4.185830)
------------------------------------- total: 4.150000sec
user system total real
msgpack 3.910000 0.210000 4.120000 ( 4.175436)
========================================================
* ruby-2.0.0-p195 pure ruby msgpack
Rehearsal ----------------------------------------------
msgpack 17.530000 0.040000 17.570000 ( 17.599123)
------------------------------------ total: 17.570000sec
user system total real
msgpack 17.250000 0.030000 17.280000 ( 17.313037)
========================================================
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