org.openjdk.jol.operations.HeapDumpStats Maven / Gradle / Ivy
/*
* Copyright (c) 2012, 2013, 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).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package org.openjdk.jol.operations;
import org.openjdk.jol.Operation;
import org.openjdk.jol.datamodel.*;
import org.openjdk.jol.heap.HeapDumpReader;
import org.openjdk.jol.info.ClassData;
import org.openjdk.jol.info.ClassLayout;
import org.openjdk.jol.layouters.CurrentLayouter;
import org.openjdk.jol.layouters.HotSpotLayouter;
import org.openjdk.jol.layouters.Layouter;
import org.openjdk.jol.layouters.RawLayouter;
import org.openjdk.jol.util.Multiset;
import java.io.File;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import static java.lang.System.in;
import static java.lang.System.out;
/**
* @author Aleksey Shipilev
*/
public class HeapDumpStats implements Operation {
@Override
public String label() {
return "heapdumpstats";
}
@Override
public String description() {
return "Consume the heap dump and print the most frequent instances.";
}
public void run(String... args) throws Exception {
if (args.length == 0) {
System.err.println("Expected a hprof file name.");
return;
}
String path = args[0];
out.println("Heap Dump: " + path);
HeapDumpReader reader = new HeapDumpReader(new File(path));
Multiset data = reader.parse();
final Multiset counts = new Multiset<>();
final Multiset sizes = new Multiset<>();
Layouter layouter = new HotSpotLayouter(new CurrentDataModel());
for (ClassData cd : data.keys()) {
long size = layouter.layout(cd).instanceSize();
counts.add(cd.name(), data.count(cd));
sizes.add(cd.name(), data.count(cd) * size);
}
List sorted = new ArrayList<>();
sorted.addAll(sizes.keys());
Collections.sort(sorted, new Comparator() {
@Override
public int compare(String o1, String o2) {
return Long.valueOf(sizes.count(o2)).compareTo(sizes.count(o1));
}
});
final int printFirst = Integer.getInteger("printFirst", 30);
int idx = 0;
out.printf(" %10s %10s %10s %s%n", "COUNT", "AVG", "SIZE", "DESCRIPTION");
out.println("-------------------------------------------------------------------------");
for (String name : sorted) {
if (++idx > printFirst) break;
long cnt = counts.count(name);
long size = sizes.count(name);
out.printf(" %10d %10d %10d %s%n", cnt, size / cnt, size, name);
}
out.println("-------------------------------------------------------------------------");
out.printf(" %10d %10s %10d %s%n", counts.size(), "", sizes.size(), "(total)");
}
}
© 2015 - 2024 Weber Informatics LLC | Privacy Policy