JMH Perf Tests

[benjchristensen]

1. Migrate all previous tests into rx.archive until we have matured with JMH
2. JMH config in gradle
3. Start of benchmarking with JMH for baseline, map and serialize

To Run

Inside ./rxjava-core/ invoke ../gradlew benchmarks

Or from base invoke ./gradlew benchmarks and it will scan each sub-module for benchmarks and then only find them in rxjava-core.

Output

Result : 72.204 ±(99.9%) 7.524 ns/op
  Statistics: (min, avg, max) = (69.221, 72.204, 74.048), stdev = 1.954
  Confidence interval (99.9%): [64.680, 79.729]


Benchmark                                                          (size)   Mode   Samples         Mean   Mean error    Units
r.jmh.Baseline.forLoopInvokingFunction                               1024   avgt         5     3230.689      486.080    ns/op
r.jmh.Baseline.forLoopInvokingFunction                            1048576   avgt         5  3394679.521   148858.373    ns/op
r.operators.OperatorMapPerf.mapIdentityFunction                         1   avgt         5       91.338        8.504    ns/op
r.operators.OperatorMapPerf.mapIdentityFunction                      1024   avgt         5     5626.727     1209.108    ns/op
r.operators.OperatorMapPerf.mapIdentityFunction                   1048576   avgt         5  6268747.085   258008.983    ns/op
r.operators.OperatorSerializePerf.noSerializationSingleThreaded      1024   avgt         5       42.198        0.791    ns/op
r.operators.OperatorSerializePerf.noSerializationSingleThreaded   1048576   avgt         5       45.935        0.911    ns/op
r.operators.OperatorSerializePerf.serializedSingleStream             1024   avgt         5       69.410       10.499    ns/op
r.operators.OperatorSerializePerf.serializedSingleStream          1048576   avgt         5       72.305       11.450    ns/op
r.operators.OperatorSerializePerf.synchronizedSingleStream           1024   avgt         5       72.238        7.233    ns/op
r.operators.OperatorSerializePerf.synchronizedSingleStream        1048576   avgt         5       72.204        7.524    ns/op

[benjchristensen]

Thank you @gvsmirnov for help getting this running. Please don't hesitate to provide suggestions and tips.

The things I'm still trying to figure out are:

1. How to measure object allocation.
2. Passing arguments into the ./gradlew benchmarks command as right now everything is hardcoded inside build.gradle
3. How to generate an UberJar/ShadowJar with all necessary code so the testing can be done via an executable jar as JMH typically done.