unportant.gist.jep180.MemoryFootprint.java Source code

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Here is the source code for unportant.gist.jep180.MemoryFootprint.java

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/*
 * Copyright 2014 Clment MATHIEU
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package unportant.gist.jep180;

import com.google.common.collect.ImmutableList;
import org.openjdk.jol.info.GraphLayout;

import java.util.HashMap;

public class MemoryFootprint {

    public static void main(String[] args) {

        for (int count : ImmutableList.of(10, 100, 1000, 10000, 100000, 1000000)) {
            Collider djbCollider = Colliders.get(Colliders.DJBX31A);
            ImmutableList<String> strings = djbCollider.generate(count);

            {
                HashMap<String, Object> map = new HashMap<String, Object>();
                for (String s : strings) {
                    map.put(s, s);
                }

                System.out.println(count + " djb " + GraphLayout.parseInstance(map).totalSize());
            }

            {
                RandomStrings randomCollider = new RandomStrings();
                strings = randomCollider.generate(count, strings.get(0).length());

                HashMap<String, Object> map = new HashMap<String, Object>();
                for (String s : strings) {
                    map.put(s, s);
                }

                System.out.println(count + " rnd " + GraphLayout.parseInstance(map).totalSize());
            }
        }
    }
}