ChineseTony commented on PR #7869:
URL: https://github.com/apache/rocketmq/pull/7869#issuecomment-1970299363
```java
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Measurement;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.annotations.Threads;
import org.openjdk.jmh.annotations.Warmup;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;
@BenchmarkMode(Mode.Throughput)
@Warmup(iterations = 3, time = 1)
@Measurement(iterations = 5, time = 3)
@Fork(1)
@State(value = Scope.Benchmark)
@OutputTimeUnit(TimeUnit.SECONDS)
public class MapUtil {
private Map<String, String> map = new HashMap<>();
@Setup
public void setup() {
for (int i = 0; i < 8000; i++) {
map.put(i + "", i + "");
}
}
@Benchmark
@Threads(8)
public void keySetMap() {
keySet();
}
@Benchmark
@Threads(8)
public void entrySetMap() {
entrySet();
}
private void entrySet() {
for (Map.Entry<String, String> entry : map.entrySet()) {
entry.getValue();
}
}
private void keySet() {
for (String key : map.keySet()) {
map.get(key);
}
}
}
```
Benchmark Mode Cnt Score Error Units
MapUtil.entrySetMap thrpt 5 172067.111 ± 452324.484 ops/s
MapUtil.keySetMap thrpt 5 109211.325 ± 41925.022 ops/s
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