Caliper中的以下基准测试代码
import com.google.caliper.BeforeExperiment;
import com.google.caliper.Benchmark;
import com.google.caliper.Param;
import com.google.caliper.runner.CaliperMain;
public class Bench_IsInstrumentationWorking {
@Param({"1000"})
private int size;
private double[] array;
@BeforeExperiment
private void init(){
array=new double[size];
}
@Benchmark
public void bench(int reps){
for (int i = 0; i < reps; i++) {
for (int j = 0; j < size; j++) {
array[j]=Math.random();
}
}
}
public static void main(String[] args) {
CaliperMain.main(Bench_IsInstrumentationWorking.class,args);
}
}
所有分配指标的结果为 0：
Experiment selection:
Benchmark Methods: [bench]
Instruments: [allocation, runtime]
User parameters: {size=[1000]}
Target VMs: [default@local]
This selection yields 2 experiments.
Trial Report (1 of 2):
Experiment {instrument=allocation, benchmarkMethod=bench, target=default@local, parameters={size=1000}}
Results:
bytes(B): min=0.00, 1st qu.=0.00, median=0.00, mean=0.00, 3rd qu.=0.00, max=0.00
objects: min=0.00, 1st qu.=0.00, median=0.00, mean=0.00, 3rd qu.=0.00, max=0.00
Trial Report (2 of 2):
Experiment {instrument=runtime, benchmarkMethod=bench, target=default@local, parameters={size=1000}}
Results:
runtime(ns): min=17175.93, 1st qu.=17264.70, median=17345.48, mean=17403.70, 3rd qu.=17414.21, max=18080.08
Collected 27 measurements from:
2 instrument(s)
2 virtual machine(s)
1 benchmark(s)
Execution complete: 19.28 s.
~/tmp/someNumber/trial-1.log充满了
Oct 05, 2021 5:53:26 AM com.google.monitoring.runtime.instrumentation.AllocationInstrumenter instrument
[stderr] WARNING: Failed to instrument class.
[stderr] java.lang.IllegalArgumentException: Unsupported class file major version 60
[stderr] at com.google.monitoring.runtime.instrumentation.asm.ClassReader.<init>(ClassReader.java:195)
[stderr] at com.google.monitoring.runtime.instrumentation.asm.ClassReader.<init>(ClassReader.java:176)
[stderr] at com.google.monitoring.runtime.instrumentation.asm.ClassReader.<init>(ClassReader.java:162)
[stderr] at com.google.monitoring.runtime.instrumentation.AllocationInstrumenter.instrument(AllocationInstrumenter.java:192)
[stderr] at com.google.monitoring.runtime.instrumentation.AllocationInstrumenter.instrument(AllocationInstrumenter.java:220)
[stderr] at com.google.monitoring.runtime.instrumentation.AllocationInstrumenter.transform(AllocationInstrumenter.java:174)
[stderr] at java.instrument/java.lang.instrument.ClassFileTransformer.transform(ClassFileTransformer.java:244)
[stderr] at java.instrument/sun.instrument.TransformerManager.transform(TransformerManager.java:188)
[stderr] at java.instrument/sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:565)
[stderr] at java.instrument/sun.instrument.InstrumentationImpl.retransformClasses0(Native Method)
[stderr] at java.instrument/sun.instrument.InstrumentationImpl.retransformClasses(InstrumentationImpl.java:168)
[stderr] at com.google.monitoring.runtime.instrumentation.AllocationInstrumenter.bootstrap(AllocationInstrumenter.java:157)
[stderr] at com.google.monitoring.runtime.instrumentation.AllocationInstrumenter.premain(AllocationInstrumenter.java:109)
[stderr] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[stderr] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
[stderr] at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[stderr] at java.base/java.lang.reflect.Method.invoke(Method.java:567)
[stderr] at com.google.monitoring.runtime.instrumentation.AllocationInstrumenterBootstrap.premain(AllocationInstrumenterBootstrap.java:48)
[stderr] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[stderr] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
[stderr] at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[stderr] at java.base/java.lang.reflect.Method.invoke(Method.java:567)
[stderr] at java.instrument/sun.instrument.InstrumentationImpl.loadClassAndStartAgent(InstrumentationImpl.java:515)
[stderr]
- 为什么会这样以及如何解决这个问题？
我的猜测是 Caliper 使用的库可能不适合 JDK 16（请参阅下面的环境详细信息）。如果是这样，当前的最大值是多少。它将运行的受支持版本？
进一步调查显示，即使在 JDK x.0.2 (11<=x<=14) 上运行，分配也保持为 0，但日志文件没有显示错误。在 15.0.2 上，行为与 16 和 17 相同（如上）
环境：
卡尺：1.0-beta-3
Gradle：7.2
OpenJDK：16.0.1
IDE：IntelliJ 2021.2.2，社区版
操作系统：Ubuntu 20.04.3 LTS
构建.gradle：
plugins {
id 'java'
}
group 'yourGroup.id'
version '0.0-SNAPSHOT'
repositories {
mavenCentral()
// mavenLocal()
}
dependencies {
testImplementation 'org.junit.jupiter:junit-jupiter-api:5.7.0'
testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.7.0'
implementation 'com.google.caliper:caliper:1.0-beta-3'
}
test {
useJUnitPlatform()
}