Some basic Java performance benchmarks for Streams, some Date operations and Strings
Benchmarks are run using JMH and can be built using mvn clean install
Prebuilt jar is included as benchmarks.jar which can be run directly
My test command was java -jar benchmarks.jar -f 1 -i 10 -wi 10 -r 5 which resulted in the output of
Benchmark Mode Cnt Score Error Units
DateBenchmark.dateLong thrpt 10 398180671.307 ± 861095.156 ops/s
DateBenchmark.dateLongWithFormat thrpt 10 3205290.937 ± 17495.643 ops/s
DateBenchmark.dateParsingWithFormat thrpt 10 829339.030 ± 5872.319 ops/s
StreamBenchmark.testFor thrpt 10 1676.135 ± 33.174 ops/s
StreamBenchmark.testForInLoop thrpt 10 543.856 ± 2.759 ops/s
StreamBenchmark.testLargeStream thrpt 10 95.626 ± 0.480 ops/s
StreamBenchmark.testLargeStreamParallel thrpt 10 128.419 ± 1.185 ops/s
StreamBenchmark.testStream thrpt 10 1637.747 ± 11.793 ops/s
StreamBenchmark.testStreamInLoop thrpt 10 432.207 ± 1.098 ops/s
StreamBenchmark.testStreamParrallel thrpt 10 8068.937 ± 260.249 ops/s
StringBenchmark.stringAppend thrpt 10 22572323.301 ± 181309.750 ops/s
StringBenchmark.stringAppendBuilder thrpt 10 6983217.796 ± 54212.734 ops/s
StringBenchmark.stringAppendBuilderLoop thrpt 10 7202.648 ± 117.500 ops/s
StringBenchmark.stringAppendBuilderLoopSized thrpt 10 8106.539 ± 135.040 ops/s
StringBenchmark.stringAppendLoop thrpt 10 11.111 ± 0.373 ops/s
StringBenchmark.stringAppendLoopPlus thrpt 10 11.624 ± 0.056 ops/s
StringBenchmark.stringAppendLoopPlusDouble thrpt 10 11.593 ± 0.084 ops/s
StringBenchmark.stringConcat thrpt 10 116474840.767 ± 766799.557 ops/s
StringBenchmark.stringCreateLoop thrpt 10 6404.057 ± 97.817 ops/s
StringBenchmark.stringFormat thrpt 10 1384875.999 ± 7025.733 ops/s