mqliang opened a new issue #7866:
URL: https://github.com/apache/pinot/issues/7866
Benchmark code
```
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@Measurement(iterations = 5, time = 30)
@Fork(1)
@State(Scope.Benchmark)
public class BenchmarkTimer {
public static void main(String[] args)
throws Exception {
ChainedOptionsBuilder opt = new
OptionsBuilder().include(BenchmarkTimer.class.getSimpleName());
new Runner(opt.build()).run();
}
@Benchmark
public void benchmarkThreadCpuTimer() {
ThreadTimer threadTimer = new ThreadTimer();
long totalThreadCpuTimeNs = threadTimer.getThreadTimeNs();
}
@Benchmark
public void benchmarkSystemCurrentTimeMillis() {
long startWallClockTimeMs = System.currentTimeMillis();
long totalWallClockTimeMs = System.currentTimeMillis() -
startWallClockTimeMs;
long totalWallClockTimeNs =
TimeUnit.MILLISECONDS.toNanos(totalWallClockTimeMs);
}
@Benchmark
public void benchmarkSystemNanoTime() {
long startWallClockTimeNs = System.nanoTime();
long totalWallClockTimeNs = System.nanoTime() - startWallClockTimeNs;
}
}
```
Benchmark result of adoptopenjdk-11.jdk on macOS Monterey v12.0.1
```
Benchmark Mode Cnt Score Error
Units
BenchmarkTimer.benchmarkSystemCurrentTimeMillis avgt 5 54.111 ± 12.025
ns/op
BenchmarkTimer.benchmarkSystemNanoTime avgt 5 61.704 ± 0.645
ns/op
BenchmarkTimer.benchmarkThreadCpuTimer avgt 5 0.526 ± 0.023
ns/op
```
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