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OperatorMergePerf.java

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/**

* Copyright 2016 Netflix, Inc.

*

* 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 io.reactivex;

import java.util.*;

import java.util.concurrent.TimeUnit;

import org.openjdk.jmh.annotations.*;

import org.openjdk.jmh.infra.Blackhole;

import io.reactivex.Flowable;

import io.reactivex.functions.Function;

import io.reactivex.schedulers.Schedulers;

@BenchmarkMode(Mode.Throughput)

@OutputTimeUnit(TimeUnit.SECONDS)

public class OperatorMergePerf {

// flatMap

@Benchmark

public void oneStreamOfNthatMergesIn1(final InputMillion input) throws InterruptedException {

Flowable<Flowable<Integer>> os = Flowable.range(1, input.size)

.map(new Function<Integer, Flowable<Integer>>() {

@Override

public Flowable<Integer> apply(Integer v) {

return Flowable.just(v);

}

});

PerfSubscriber o = input.newLatchedObserver();

Flowable.merge(os).subscribe(o);

if (input.size == 1) {

while (o.latch.getCount() != 0);

} else {

o.latch.await();

}

}

// flatMap

@Benchmark

public void merge1SyncStreamOfN(final InputMillion input) throws InterruptedException {

Flowable<Flowable<Integer>> os = Flowable.just(1).map(new Function<Integer, Flowable<Integer>>() {

@Override

public Flowable<Integer> apply(Integer i) {

return Flowable.range(0, input.size);

}

});

PerfSubscriber o = input.newLatchedObserver();

Flowable.merge(os).subscribe(o);

if (input.size == 1) {

while (o.latch.getCount() != 0);

} else {

o.latch.await();

}

}

@Benchmark

public void mergeNSyncStreamsOfN(final InputThousand input) throws InterruptedException {

Flowable<Flowable<Integer>> os = input.observable.map(new Function<Integer, Flowable<Integer>>() {

@Override

public Flowable<Integer> apply(Integer i) {

return Flowable.range(0, input.size);

}

});

PerfSubscriber o = input.newLatchedObserver();

Flowable.merge(os).subscribe(o);

if (input.size == 1) {

while (o.latch.getCount() != 0);

} else {

o.latch.await();

}

}

@Benchmark

public void mergeNAsyncStreamsOfN(final InputThousand input) throws InterruptedException {

Flowable<Flowable<Integer>> os = input.observable.map(new Function<Integer, Flowable<Integer>>() {

@Override

public Flowable<Integer> apply(Integer i) {

return Flowable.range(0, input.size).subscribeOn(Schedulers.computation());

}

});

PerfSubscriber o = input.newLatchedObserver();

Flowable.merge(os).subscribe(o);

if (input.size == 1) {

while (o.latch.getCount() != 0);

} else {

o.latch.await();

}

}

@Benchmark

public void mergeTwoAsyncStreamsOfN(final InputThousand input) throws InterruptedException {

PerfSubscriber o = input.newLatchedObserver();

Flowable<Integer> ob = Flowable.range(0, input.size).subscribeOn(Schedulers.computation());

Flowable.merge(ob, ob).subscribe(o);

if (input.size == 1) {

while (o.latch.getCount() != 0);

} else {

o.latch.await();

}

}

@Benchmark

public void mergeNSyncStreamsOf1(final InputForMergeN input) throws InterruptedException {

PerfSubscriber o = input.newLatchedObserver();

Flowable.merge(input.observables).subscribe(o);

if (input.size == 1) {

while (o.latch.getCount() != 0);

} else {

o.latch.await();

}

}

@State(Scope.Thread)

public static class InputForMergeN {

@Param({ "1", "100", "1000" })

// @Param({ "1000" })

public int size;

private Blackhole bh;

List<Flowable<Integer>> observables;

@Setup

public void setup(final Blackhole bh) {

this.bh = bh;

observables = new ArrayList<Flowable<Integer>>();

for (int i = 0; i < size; i++) {

observables.add(Flowable.just(i));

}

}

public PerfSubscriber newLatchedObserver() {

return new PerfSubscriber(bh);

}

}

@State(Scope.Thread)

public static class InputMillion extends InputWithIncrementingInteger {

@Param({ "1", "1000", "1000000" })

// @Param({ "1000" })

public int size;

@Override

public int getSize() {

return size;

}

}

@State(Scope.Thread)

public static class InputThousand extends InputWithIncrementingInteger {

@Param({ "1", "1000" })

// @Param({ "1000" })

public int size;

@Override

public int getSize() {

return size;

}

}

}