richardstartin commented on issue #7866:
URL: https://github.com/apache/pinot/issues/7866#issuecomment-985997796
For the sake of posterity, here are the results for
`benchmarkThreadCpuTimer` with and without changes on my MacBook:
DCE:
```java
@Benchmark
public void benchmarkThreadCpuTimer() {
ThreadTimer threadTimer = new ThreadTimer();
long totalThreadCpuTimeNs = threadTimer.getThreadTimeNs();
}
```
```
Benchmark Mode Cnt Score Error Units
BenchmarkTimer.benchmarkThreadCpuTimer avgt 5 0.523 ± 0.106 ns/op
```
Blackhole, measurement disabled:
```java
@Benchmark
public long benchmarkThreadCpuTimer() {
ThreadTimer threadTimer = new ThreadTimer();
return threadTimer.getThreadTimeNs();
}
```
```
Benchmark Mode Cnt Score Error Units
BenchmarkTimer.benchmarkThreadCpuTimer avgt 5 1.988 ± 0.151 ns/op
```
Blackhole, measurement enabled:
```java
@Setup(Level.Trial)
public void setup() {
ThreadTimer.setThreadCpuTimeMeasurementEnabled(true);
}
@Benchmark
public long benchmarkThreadCpuTimer() {
ThreadTimer threadTimer = new ThreadTimer();
return threadTimer.getThreadTimeNs();
}
```
```
Benchmark Mode Cnt Score Error Units
BenchmarkTimer.benchmarkThreadCpuTimer avgt 5 2382.225 ± 304.219 ns/op
```
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