是否可以在 main 内部使用 IntelliJ 'run' 命令运行 caliper？

Question

我是 caliper 的新手，我想知道是否可以创建一个 main 方法，然后右键单击并选择使用 IntelliJ 的“运行”？

public class Benchmark1 extends Benchmark{

    @Param({"10", "100", "1000", "10000"}) private int length;


    public void timeNanoTime(int reps) {
        for (int i = 0; i < reps; i++) {
            System.nanoTime();
        }
    }

    public static void main(String[] args) {
        CaliperMain.main(Benchmark1.class, args);
    }
}

当我尝试运行上述程序时，我收到此错误：

Experiment selection: 
  Instruments:   [allocation, micro]
  User parameters:   {length=[10, 100, 1000, 10000]}
  Virtual machines:  [default]
  Selection type:    Full cartesian product

This selection yields 8 experiments.
Starting experiment 1 of 8: {instrument=allocation, method=NanoTime, vm=default, parameters={length=10}}
java.lang.RuntimeException: java.lang.NoSuchMethodError: com.google.common.base.Stopwatch.elapsed(Ljava/util/concurrent/TimeUnit;)J
    at com.google.caliper.runner.ExperimentingCaliperRun.measure(ExperimentingCaliperRun.java:394)
    at com.google.caliper.runner.ExperimentingCaliperRun.run(ExperimentingCaliperRun.java:207)
    at com.google.caliper.runner.CaliperMain.exitlessMain(CaliperMain.java:131)
    at com.google.caliper.runner.CaliperMain.main(CaliperMain.java:78)
    at com.google.caliper.runner.CaliperMain.main(CaliperMain.java:66)
    at xxxxxxxxxxx(redacted).main(Benchmark1.java:28)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
Caused by: java.lang.NoSuchMethodError: com.google.common.base.Stopwatch.elapsed(Ljava/util/concurrent/TimeUnit;)J
    at com.google.caliper.runner.ExperimentingCaliperRun.getRemainingTrialNanos(ExperimentingCaliperRun.java:406)
    at com.google.caliper.runner.ExperimentingCaliperRun.access$400(ExperimentingCaliperRun.java:95)
    at com.google.caliper.runner.ExperimentingCaliperRun$LineConsumer.call(ExperimentingCaliperRun.java:513)
    at com.google.caliper.runner.ExperimentingCaliperRun$LineConsumer.call(ExperimentingCaliperRun.java:495)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
    at java.lang.Thread.run(Thread.java:680)
The worker exited without producing data. It has likely crashed. Run with --verbose to see any worker output.

An unexpected exception has been thrown by the caliper runner.
Please see https://sites.google.com/site/caliperusers/issues

Process finished with exit code 1

另外，由于我使用的是 IntelliJ，并且我的卡尺是在 maven 中定义的（即测试范围）：

<dependency>
    <groupId>com.google.caliper</groupId>
    <artifactId>caliper</artifactId>
    <version>${caliper-version}</version>
    <scope>test</scope>
</dependency>

如何从命令行运行 caliper？

Answer 1

我猜这是一个 CLASSPATH 混淆。您的 CLASSPATH 上可能有旧的 Guava 版本，而 Caliper 需要 14.0（其中添加了方法 elapsed(TimeUnit)）。更新就是这样。

如果您无法更新，请确保首先使用 Caliper 的 Guava...不知道会出现什么问题，但我可能会工作。