Benchmark

IndexOfCharWithIndexAligned.java

/*
 * Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
 * Copyright Huawei Technologies Co., Ltd. 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.
 *
 * 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.bench.java.lang;

import java.util.Random;
import org.openjdk.jmh.annotations.*;
import java.util.concurrent.TimeUnit;
 
@State(Scope.Benchmark)
@Warmup(iterations = 5)
@Measurement(iterations = 5, time = 10, TimeUnit = TimeUnit.SECONDS)
@BenchmarkMode(Mode.Throughput)
@OutputTimeUnit(TimeUnit.MILLISECONDS)
public class IndexOfBenchmark {
    private static final Random rng = new Random(1999);
    private static final int pathCnt = 1000;
    private static final String [] latn1Len64         = new String[pathCnt];

    static {
        for (int i = 0; i < pathCnt; i++) {
            latn1Len64[i] = makeRndString(false, 64);
        }
    }

    private static String makeRndString(boolean isUtf16, int length) {
        StringBuilder sb = new StringBuilder(length);
        if(length > 0){
            sb.append(isUtf16 ? '☺' : 'b');

            for (int i = 1; i < length - 1; i++) {
                sb.append((char)('b' + rng.nextInt(26)));
            }

            sb.append(rng.nextInt(3) >= 1 ? 'a' : 'b'); //66.6% of time 'a' is in string
        }
        return sb.toString();
    }

    @Benchmark
    @Fork(value = 1, jvmArgs={"-XX:+AvoidUnalignedAccesses"})
    public static void latin1Len0064Char() {
        int ret = 0;
        for (String what : latn1Len64) {
            ret += what.indexOf('a');
        }
    }

    @Benchmark
    @Fork(value = 1, jvmArgs={"-XX:+AvoidUnalignedAccesses"})
    public static void latin1Len0064CharWithIndex1() {
        int ret = 0;
        for (String what : latn1Len64) {
            ret += what.indexOf('a', 1);
        }
    }

    @Benchmark
    @Fork(value = 1, jvmArgs={"-XX:+AvoidUnalignedAccesses"})
    public static void latin1Len0064CharWithIndex2() {
        int ret = 0;
        for (String what : latn1Len64) {
            ret += what.indexOf('a', 2);
        }
    }

    @Benchmark
    @Fork(value = 1, jvmArgs={"-XX:+AvoidUnalignedAccesses"})
    public static void latin1Len0064CharWithIndex3() {
        int ret = 0;
        for (String what : latn1Len64) {
            ret += what.indexOf('a', 3);
        }
    }

    @Benchmark
    @Fork(value = 1, jvmArgs={"-XX:+AvoidUnalignedAccesses"})
    public static void latin1Len0064CharWithIndex4() {
        int ret = 0;
        for (String what : latn1Len64) {
            ret += what.indexOf('a', 4);
        }
    }

    @Benchmark
    @Fork(value = 1, jvmArgs={"-XX:+AvoidUnalignedAccesses"})
    public static void latin1Len0064CharWithIndex5() {
        int ret = 0;
        for (String what : latn1Len64) {
            ret += what.indexOf('a', 5);
        }
    }

    @Benchmark
    @Fork(value = 1, jvmArgs={"-XX:+AvoidUnalignedAccesses"})
    public static void latin1Len0064CharWithIndex6() {
        int ret = 0;
        for (String what : latn1Len64) {
            ret += what.indexOf('a', 6);
        }
    }

    @Benchmark
    @Fork(value = 1, jvmArgs={"-XX:+AvoidUnalignedAccesses"})
    public static void latin1Len0064CharWithIndex7() {
        int ret = 0;
        for (String what : latn1Len64) {
            ret += what.indexOf('a', 7);
        }
    }
}

IndexOfCharWithIndexUnaligned.java

/*
 * Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
 * Copyright Huawei Technologies Co., Ltd. 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.
 *
 * 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.bench.java.lang;

import java.util.Random;
import org.openjdk.jmh.annotations.*;
import java.util.concurrent.TimeUnit;
 
@State(Scope.Benchmark)
@Warmup(iterations = 5)
@Measurement(iterations = 5, time = 10, TimeUnit = TimeUnit.SECONDS)
@BenchmarkMode(Mode.Throughput)
@OutputTimeUnit(TimeUnit.MILLISECONDS)
public class IndexOfBenchmark {
    private static final Random rng = new Random(1999);
    private static final int pathCnt = 1000;
    private static final String [] latn1Len64         = new String[pathCnt];

    static {
        for (int i = 0; i < pathCnt; i++) {
            latn1Len64[i] = makeRndString(false, 64);
        }
    }

    private static String makeRndString(boolean isUtf16, int length) {
        StringBuilder sb = new StringBuilder(length);
        if(length > 0){
            sb.append(isUtf16 ? '☺' : 'b');

            for (int i = 1; i < length - 1; i++) {
                sb.append((char)('b' + rng.nextInt(26)));
            }

            sb.append(rng.nextInt(3) >= 1 ? 'a' : 'b'); //66.6% of time 'a' is in string
        }
        return sb.toString();
    }

    @Benchmark
    @Fork(value = 1, jvmArgs={"-XX:-AvoidUnalignedAccesses"})
    public static void latin1Len0064Char() {
        int ret = 0;
        for (String what : latn1Len64) {
            ret += what.indexOf('a');
        }
    }

    @Benchmark
    @Fork(value = 1, jvmArgs={"-XX:-AvoidUnalignedAccesses"})
    public static void latin1Len0064CharWithIndex1() {
        int ret = 0;
        for (String what : latn1Len64) {
            ret += what.indexOf('a', 1);
        }
    }

    @Benchmark
    @Fork(value = 1, jvmArgs={"-XX:-AvoidUnalignedAccesses"})
    public static void latin1Len0064CharWithIndex2() {
        int ret = 0;
        for (String what : latn1Len64) {
            ret += what.indexOf('a', 2);
        }
    }

    @Benchmark
    @Fork(value = 1, jvmArgs={"-XX:-AvoidUnalignedAccesses"})
    public static void latin1Len0064CharWithIndex3() {
        int ret = 0;
        for (String what : latn1Len64) {
            ret += what.indexOf('a', 3);
        }
    }

    @Benchmark
    @Fork(value = 1, jvmArgs={"-XX:-AvoidUnalignedAccesses"})
    public static void latin1Len0064CharWithIndex4() {
        int ret = 0;
        for (String what : latn1Len64) {
            ret += what.indexOf('a', 4);
        }
    }

    @Benchmark
    @Fork(value = 1, jvmArgs={"-XX:-AvoidUnalignedAccesses"})
    public static void latin1Len0064CharWithIndex5() {
        int ret = 0;
        for (String what : latn1Len64) {
            ret += what.indexOf('a', 5);
        }
    }

    @Benchmark
    @Fork(value = 1, jvmArgs={"-XX:-AvoidUnalignedAccesses"})
    public static void latin1Len0064CharWithIndex6() {
        int ret = 0;
        for (String what : latn1Len64) {
            ret += what.indexOf('a', 6);
        }
    }

    @Benchmark
    @Fork(value = 1, jvmArgs={"-XX:-AvoidUnalignedAccesses"})
    public static void latin1Len0064CharWithIndex7() {
        int ret = 0;
        for (String what : latn1Len64) {
            ret += what.indexOf('a', 7);
        }
    }
}