JNI test
A simple benchmark that tells how much time it takes to create a Java object when you (a) have to look up the class object and the constructor id; (b) already have them.
How to build
$ mvn package # Build the benchmark and Java code under test
$ cd src/main/cpp
$ make # Build the definitions of native methods
$ cd -
How to run
$ java -Djava.library.path=src/main/cpp/ -jar target/benchmarks.jar -wi 5 -i 10 -f 4
Results from my laptop
Throughput (the higher the better):
Benchmark Mode Cnt Score Error Units
JniBenchmark.baseline thrpt 50 153.299 ± 1.264 ops/us
JniBenchmark.createEntryCached thrpt 50 4.247 ± 0.024 ops/us
JniBenchmark.createEntrySimple thrpt 50 1.527 ± 0.012 ops/us
JniBenchmark.createObjectCached thrpt 50 4.839 ± 0.016 ops/us
JniBenchmark.getArgumentsFromNativeCode thrpt 50 57.672 ± 0.241 ops/us
Average time per operation (the lower the better):
Benchmark Mode Cnt Score Error Units
JniBenchmark.baseline avgt 50 0.008 ± 0.002 us/op
JniBenchmark.createEntryCached avgt 50 0.235 ± 0.001 us/op
JniBenchmark.createEntrySimple avgt 50 0.671 ± 0.024 us/op
JniBenchmark.createObjectCached avgt 50 0.207 ± 0.001 us/op
JniBenchmark.getArgumentsFromNativeCode avgt 50 0.018 ± 0.001 us/op