我只是想写一个简单的基准-
public class IntegerCompareBenchmark extends SimpleBenchmark {
private Integer left;
private Integer right;
@Override protected void setUp() {
left = 100;
right = 200;
}
public int timeIntsCompare(int reps) {
int val = 0;
for (int i = 0; i < reps; i++) {
val += Ints.compare(left, right);
}
return val;
}
public int timeIntegerCompare(int reps) {
int val = 0;
for (int i = 0; i < reps; i++) {
val += left.compareTo(right);
}
return val;
}
public static void main(String[] args) throws Exception {
Runner.main(IntegerCompareBenchmark.class, args);
}
}
但失败，但有例外-
Failed to execute java -cp com.google.caliper.InProcessRunner --warmupMillis 3000 --runMillis 1000 --measurementType TIME --marker //ZxJ/ -Dbenchmark=IntsCompare com.poc.IntegerCompareBenchmark
starting Scenario{vm=java, trial=0, benchmark=IntsCompare}
[caliper] [starting warmup]
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Error: Doing 2x as much work didn't take 2x as much time! Is the JIT optimizing away the body of your benchmark?
Usage: Runner [OPTIONS...] <benchmark>
<benchmark>: a benchmark class or suite
OPTIONS
-D<param>=<value>: fix a benchmark parameter to a given value.
Multiple values can be supplied by separating them with the
delimiter specified in the --delimiter argument.
For example: "-Dfoo=bar,baz,bat"
"benchmark" is a special parameter that can be used to specify
which benchmark methods to run. For example, if a benchmark has
the method "timeFoo", it can be run alone by using
"-Dbenchmark=Foo". "benchmark" also accepts a delimiter
separated list of methods to run.
-J<param>=<value>: set a JVM argument to the given value.
Multiple values can be supplied by separating them with the
delimiter specified in the --delimiter argument.
For example: "-JmemoryMax=-Xmx32M,-Xmx512M"
--delimiter <delimiter>: character or string to use as a delimiter
for parameter and vm values.
Default: ","
--warmupMillis <millis>: duration to warmup each benchmark
--runMillis <millis>: duration to execute each benchmark
--captureVmLog: record the VM's just-in-time compiler and GC logs.
This may slow down or break benchmark display tools.
--measureMemory: measure the number of allocations done and the amount of
memory used by invocations of the benchmark.
Default: off
--vm <vm>: executable to test benchmark on. Multiple VMs may be passed
in as a list separated by the delimiter specified in the
--delimiter argument.
--timeUnit <unit>: unit of time to use for result. Depends on the units
defined in the benchmark's getTimeUnitNames() method, if defined.
Default Options: ns, us, ms, s
--instanceUnit <unit>: unit to use for allocation instances result.
Depends on the units defined in the benchmark's
getInstanceUnitNames() method, if defined.
Default Options: instances, K instances, M instances, B instances
--memoryUnit <unit>: unit to use for allocation memory size result.
Depends on the units defined in the benchmark's
getMemoryUnitNames() method, if defined.
Default Options: B, KB, MB, GB
--saveResults <file/dir>: write results to this file or directory
--printScore: if present, also display an aggregate score for this run,
where higher is better. This number has no particular meaning,
but can be compared to scores from other runs that use the exact
same arguments.
--uploadResults <file/dir>: upload this file or directory of files
to the web app. This argument ends Caliper early and is thus
incompatible with all other arguments.
--debug: run without measurement for use with debugger or profiling.
--debug-reps: fixed number of reps to run with --debug.
Default: "1000"
[caliper] [scenarios finished]
An exception was thrown from the benchmark code.
com.google.caliper.ConfigurationException: Failed to execute java -cp <class path files> com.google.caliper.InProcessRunner --warmupMillis 3000 --runMillis 1000 --measurementType TIME --marker //ZxJ/ -Dbenchmark=IntsCompare com.poc.IntegerCompareBenchmark
at com.google.caliper.Runner.measure(Runner.java:309)
at com.google.caliper.Runner.runScenario(Runner.java:229)
at com.google.caliper.Runner.runOutOfProcess(Runner.java:378)
at com.google.caliper.Runner.run(Runner.java:97)
at com.google.caliper.Runner.main(Runner.java:423)
at com.google.caliper.Runner.main(Runner.java:440)
at com.poc.IntegerCompareBenchmark.main(IntegerCompareBenchmark.java:45)
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)
Process finished with exit code 1
我的其他基准测试运行得很好。我在这里做错了吗？
最佳答案
看起来您的VM的JIT可以将循环主体优化为零。考虑使用左右旋转值吗？ （也许基于val？）
关于java - 运行基准测试时发生异常，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/6646878/