use JMH to benchmark the performance of these two class
```
@BenchmarkMode({Mode.AverageTime})
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@Warmup(iterations = 3, time = 5)
@Measurement(iterations = 3, time = 5)
@Threads(10)
@Fork(1)
@State(Scope.Benchmark)
public class RandomBenchmark {
Random random = new Random();
@Benchmark
public int random() {
return random.nextInt();
}
@Benchmark
public int threadLocalRandom() {
return ThreadLocalRandom.current().nextInt();
}
public static void main(String[] args) throws RunnerException {
Options opt = new OptionsBuilder()
.include(RandomBenchmark.class.getSimpleName())
.build();
new Runner(opt).run();
}
}
```
and the output is shown below
```
Benchmark Mode Cnt Score Error Units
RandomBenchmark.random avgt 3 648.175 ± 267.727 ns/op
RandomBenchmark.threadLocalRandom avgt 3 18.935 ± 19.511 ns/op
```
[ Full content available at:
https://github.com/apache/incubator-dubbo/pull/2433 ]
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