CompilerProfiler.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
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 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
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 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
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package org.openjdk.jmh.profile;

import org.openjdk.jmh.infra.BenchmarkParams;
import org.openjdk.jmh.infra.IterationParams;
import org.openjdk.jmh.results.*;
import org.openjdk.jmh.runner.IterationType;

import java.lang.management.CompilationMXBean;
import java.lang.management.ManagementFactory;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;

public class CompilerProfiler implements InternalProfiler {
    private static final int UNDEFINED = -1;

    private final CompilationMXBean bean;

    private long prevTime = UNDEFINED;
    private long warmupTime = UNDEFINED;

    @Override
    public String getDescription() {
        return "JIT compiler profiling via standard MBeans";
    }

    public CompilerProfiler() throws ProfilerException {
        bean = ManagementFactory.getCompilationMXBean();
        if (!bean.isCompilationTimeMonitoringSupported()) {
            throw new ProfilerException("The MXBean is available, but compilation time monitoring is disabled.");
        }
    }

    @Override
    public void beforeIteration(BenchmarkParams benchmarkParams, IterationParams iterationParams) {
        try {
            if (prevTime == UNDEFINED) {
                long curTime = bean.getTotalCompilationTime();
                prevTime = curTime;
                warmupTime = curTime;
            }
        } catch (UnsupportedOperationException e) {
            // do nothing
        }
    }

    @Override
    public Collection<? extends Result> afterIteration(BenchmarkParams benchmarkParams, IterationParams iterationParams, IterationResult result) {
        try {
            long curTime = bean.getTotalCompilationTime();
            long delta = curTime - prevTime;
            prevTime = curTime;

            if (iterationParams.getType() == IterationType.MEASUREMENT) {
                Collection<ScalarResult> res = new ArrayList<>();
                if (warmupTime != UNDEFINED) {
                    res.add(new ScalarResult("compiler.time.warmup", curTime - warmupTime, "ms", AggregationPolicy.SUM));
                    warmupTime = UNDEFINED;
                }
                res.add(new ScalarResult("compiler.time.measurement", delta, "ms", AggregationPolicy.SUM));
                res.add(new ScalarResult("compiler.time.total", curTime, "ms", AggregationPolicy.MAX));
                return res;
            } else {
                return Collections.emptyList();
            }
        } catch (UnsupportedOperationException e) {
            return Collections.emptyList();
        }
    }

}