package org.openjdk.jmh.profile;
import org.openjdk.jmh.infra.BenchmarkParams;
import org.openjdk.jmh.infra.IterationParams;
import org.openjdk.jmh.results.*;
import java.lang.management.CompilationMXBean;
import java.lang.management.ManagementFactory;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
public class CompilerProfiler implements InternalProfiler {
private long startCompTime;
@Override
public String getDescription() {
return "JIT compiler profiling via standard MBeans";
}
public CompilerProfiler() throws ProfilerException {
CompilationMXBean comp = ManagementFactory.getCompilationMXBean();
if (!comp.isCompilationTimeMonitoringSupported()) {
throw new ProfilerException("The MXBean is available, but compilation time monitoring is disabled.");
}
}
@Override
public void beforeIteration(BenchmarkParams benchmarkParams, IterationParams iterationParams) {
CompilationMXBean comp = ManagementFactory.getCompilationMXBean();
try {
startCompTime = comp.getTotalCompilationTime();
} catch (UnsupportedOperationException e) {
}
}
@Override
public Collection<? extends Result> afterIteration(BenchmarkParams benchmarkParams, IterationParams iterationParams, IterationResult result) {
CompilationMXBean comp = ManagementFactory.getCompilationMXBean();
try {
long curTime = comp.getTotalCompilationTime();
return Arrays.asList(
new ScalarResult(Defaults.PREFIX + "compiler.time.profiled", curTime - startCompTime, "ms", AggregationPolicy.SUM),
new ScalarResult(Defaults.PREFIX + "compiler.time.total", curTime, "ms", AggregationPolicy.MAX)
);
} catch (UnsupportedOperationException e) {
return Collections.emptyList();
}
}
}