Merge pull request #3376 from akarnokd/RxVsStreamPerf2x

2.x: perf comparing Observable, NbpObservable, Stream and ParallelStream

Author: akarnokd

src/perf/java/io/reactivex/RxVsStreamPerf.java

@@ -0,0 +1,99 @@
+/**
+ * Copyright 2015 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;
+
+@BenchmarkMode(Mode.Throughput)
+@Warmup(iterations = 5)
+@Measurement(iterations = 5, time = 5, timeUnit = TimeUnit.SECONDS)
+@OutputTimeUnit(TimeUnit.SECONDS)
+@Fork(value = 1)
+@State(Scope.Thread)
+public class RxVsStreamPerf {
+    @Param({ "1", "1000", "1000000" })
+    public int times;
+    
+    Observable<Integer> range;
+    
+    NbpObservable<Integer> rangeNbp;
+
+    Observable<Integer> rangeFlatMap;
+
+    NbpObservable<Integer> rangeNbpFlatMap;
+    
+    List<Integer> values;
+
+    @Setup
+    public void setup() {
+        range = Observable.range(1, times);
+        
+        rangeFlatMap = range.flatMap(v -> Observable.range(v, 2));
+        
+        rangeNbp = NbpObservable.range(1, times);
+
+        rangeNbpFlatMap = rangeNbp.flatMap(v -> NbpObservable.range(v, 2));
+        
+        values = range.toList().toBlocking().first();
+    }
+    
+    @Benchmark
+    public void range(Blackhole bh) {
+        range.subscribe(new LatchedObserver<>(bh));
+    }
+
+    @Benchmark
+    public void rangeNbp(Blackhole bh) {
+        rangeNbp.subscribe(new LatchedNbpObserver<>(bh));
+    }
+
+    @Benchmark
+    public void rangeFlatMap(Blackhole bh) {
+        rangeFlatMap.subscribe(new LatchedObserver<>(bh));
+    }
+
+    @Benchmark
+    public void rangeNbpFlatMap(Blackhole bh) {
+        rangeNbpFlatMap.subscribe(new LatchedNbpObserver<>(bh));
+    }
+    
+    @Benchmark
+    public void stream(Blackhole bh) {
+        values.stream().forEach(bh::consume);
+    }
+
+    @Benchmark
+    public void streamFlatMap(Blackhole bh) {
+        values.stream()
+        .flatMap(v -> Arrays.asList(v, v + 1).stream())
+        .forEach(bh::consume);
+    }
+    
+    @Benchmark
+    public void streamParallel(Blackhole bh) {
+        values.stream().parallel().forEach(bh::consume);
+    }
+
+    @Benchmark
+    public void streamParallelFlatMap(Blackhole bh) {
+        values.stream()
+        .flatMap(v -> Arrays.asList(v, v + 1).stream())
+        .parallel()
+        .forEach(bh::consume);
+    }
+}