JMH benchmark for #39 and #42

Just wanted to keep this here for further reference.

With #39 and #42 there were some changes done to have less GC happen and to improve the general Message.toString() performance.

Here are the files used. Just package them into a new JMH benchmark project and then use

• mvn clean install
• java -jar target/benchmarks.jar -prof gc

JMH benchmark
Message.java - the improved method is called toString2()
FieldMap.java
NumbersCache.java

Some example results where we can see that the troughput has been improved as well as the GC count and time is lower with the new method.

Benchmark                                                      Mode  Cnt       Score      Error   Units
MyBenchmark.testNewToString                                   thrpt  200  210499.265 ± 3857.339   ops/s
MyBenchmark.testNewToString:·gc.alloc.rate                    thrpt  200     248.304 ±    4.549  MB/sec
MyBenchmark.testNewToString:·gc.alloc.rate.norm               thrpt  200    1856.002 ±    0.001    B/op
MyBenchmark.testNewToString:·gc.churn.PS_Eden_Space           thrpt  200     252.547 ±   20.310  MB/sec
MyBenchmark.testNewToString:·gc.churn.PS_Eden_Space.norm      thrpt  200    1885.374 ±  144.966    B/op
MyBenchmark.testNewToString:·gc.churn.PS_Survivor_Space       thrpt  200       0.014 ±    0.004  MB/sec
MyBenchmark.testNewToString:·gc.churn.PS_Survivor_Space.norm  thrpt  200       0.107 ±    0.032    B/op
MyBenchmark.testNewToString:·gc.count                         thrpt  200     330.000             counts
MyBenchmark.testNewToString:·gc.time                          thrpt  200     237.000                 ms
MyBenchmark.testOldToString                                   thrpt  200  141528.707 ± 2649.763   ops/s
MyBenchmark.testOldToString:·gc.alloc.rate                    thrpt  200     586.761 ±   10.672  MB/sec
MyBenchmark.testOldToString:·gc.alloc.rate.norm               thrpt  200    6524.003 ±    8.524    B/op
MyBenchmark.testOldToString:·gc.churn.PS_Eden_Space           thrpt  200     586.614 ±   11.655  MB/sec
MyBenchmark.testOldToString:·gc.churn.PS_Eden_Space.norm      thrpt  200    6522.385 ±   53.678    B/op
MyBenchmark.testOldToString:·gc.churn.PS_Survivor_Space       thrpt  200       0.104 ±    0.008  MB/sec
MyBenchmark.testOldToString:·gc.churn.PS_Survivor_Space.norm  thrpt  200       1.167 ±    0.098    B/op
MyBenchmark.testOldToString:·gc.count                         thrpt  200    2748.000             counts
MyBenchmark.testOldToString:·gc.time                          thrpt  200    1835.000                 ms