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/*
* Copyright (c) 2020, 2020, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* 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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package org.openjdk.jmh.profile;
import org.openjdk.jmh.infra.BenchmarkParams;
import org.openjdk.jmh.results.BenchmarkResult;
import org.openjdk.jmh.results.Result;
import org.openjdk.jmh.results.TextResult;
import org.openjdk.jmh.util.FileUtils;
import org.openjdk.jmh.util.TempFile;
import org.openjdk.jmh.util.Utils;
import java.io.File;
import java.io.IOException;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.concurrent.TimeUnit;
public final class LinuxPerfC2CProfiler implements ExternalProfiler {
protected final TempFile perfBinData;
public LinuxPerfC2CProfiler() throws ProfilerException {
try {
perfBinData = FileUtils.weakTempFile("perf-c2c-bin");
} catch (IOException e) {
throw new ProfilerException(e);
}
}
@Override
public Collection addJVMInvokeOptions(BenchmarkParams params) {
long delay = TimeUnit.NANOSECONDS.toMillis(params.getWarmup().getCount() *
params.getWarmup().getTime().convertTo(TimeUnit.NANOSECONDS))
+ TimeUnit.SECONDS.toMillis(1); // loosely account for the JVM lag
return Arrays.asList("perf", "c2c", "record", "-o", perfBinData.getAbsolutePath(), "--", "--delay", String.valueOf(delay));
}
@Override
public Collection addJVMOptions(BenchmarkParams params) {
return Collections.emptyList();
}
@Override
public void beforeTrial(BenchmarkParams params) {}
@Override
public Collection afterTrial(BenchmarkResult br, long pid, File stdOut, File stdErr) {
try {
Process process = new ProcessBuilder("perf", "c2c", "report", "--stats", "-i", perfBinData.getAbsolutePath())
.redirectErrorStream(true)
.start();
Collection lines = FileUtils.readAllLines(process.getInputStream());
String out = Utils.join(lines, System.lineSeparator());
return Collections.singleton(new TextResult(out, "perfc2c"));
} catch (IOException e) {
throw new RuntimeException(e);
}
}
@Override
public boolean allowPrintOut() {
return false;
}
@Override
public boolean allowPrintErr() {
return false;
}
@Override
public String getDescription() {
return "Linux perf c2c profiler";
}
}