@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@Warmup(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
@Measurement(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
@Fork(1)
@State(Scope.Benchmark)
public class JMHSample_27_Params {
/**
* In many cases, the experiments require walking the configuration space
* for a benchmark. This is needed for additional control, or investigating
* how the workload performance changes with different settings.
*/
@Param({"1", "31", "65", "101", "103"})
public int arg;
@Param({"0", "1", "2", "4", "8", "16", "32"})
public int certainty;
@Benchmark
public boolean bench() {
return BigInteger.valueOf(arg).isProbablePrime(certainty);
}
public static void main(String[] args) throws RunnerException {
Options opt = new OptionsBuilder()
.include(JMHSample_27_Params.class.getSimpleName())
// .param("arg", "41", "42") // Use this to selectively constrain/override parameters
.build();
new Runner(opt).run();
}
}
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-core</artifactId>
<version>1.20</version>
</dependency>
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-generator-annprocess</artifactId>
<version>1.20</version>
</dependency>
//放到plugins中
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>2.0</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<finalName>microbenchmarks</finalName>
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>org.openjdk.jmh.Main</mainClass>
</transformer>
</transformers>
</configuration>
</execution>
</executions>
</plugin>
package com.beikbank.settlement.jms;
import org.openjdk.jmh.annotations.*;
import org.openjdk.jmh.runner.Runner;
import org.openjdk.jmh.runner.RunnerException;
import org.openjdk.jmh.runner.options.Options;
import org.openjdk.jmh.runner.options.OptionsBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.concurrent.TimeUnit;
@BenchmarkMode(Mode.AverageTime) // 测试方法平均执行时间
@OutputTimeUnit(TimeUnit.MICROSECONDS) // 输出结果的时间粒度为微秒
@State(Scope.Thread) // 每个测试线程一个实例
public class FirstBenchMark {
private static Logger log = LoggerFactory.getLogger(FirstBenchMark.class);
@Benchmark
public String stringConcat() {
String a = "a";
String b = "b";
String c = "c";
String s = a + b + c;
log.debug(s);
return s;
}
public static void main(String[] args) throws RunnerException {
// 使用一个单独进程执行测试,执行5遍warmup,然后执行5遍测试
Options opt = new OptionsBuilder().include(FirstBenchMark.class.getSimpleName()).forks(1).warmupIterations(5)
.measurementIterations(5).build();
new Runner(opt).run();
}
}
...
16:05:49.342 [com.beikbank.settlement.jms.FirstBenchMark.stringConcat-jmh-worker-1] DEBUG com.beikbank.settlement.jms.FirstBenchMark - abc
16:05:49.342 [com.beikbank.settlement.jms.FirstBenchMark.stringConcat-jmh-worker-1] DEBUG com.beikbank.settlement.jms.FirstBenchMark - abc
75.525 us/op
Result "com.beikbank.settlement.jms.FirstBenchMark.stringConcat":
71.340 ±(99.9%) 12.417 us/op [Average]
(min, avg, max) = (68.386, 71.340, 75.525), stdev = 3.225
CI (99.9%): [58.923, 83.757] (assumes normal distribution)
# Run complete. Total time: 00:00:14
Benchmark Mode Cnt Score Error Units
FirstBenchMark.stringConcat avgt 5 71.340 ± 12.417 us/op
可以看出此方法运行时间在71微秒正负12微秒之间
参考 https://blog.csdn.net/lxbjkben/article/details/79410740