1.x: ConcatMap vs ConcatMapIterable perf (#3853)

Author: akarnokd

src/perf/java/rx/operators/ConcatMapInterablePerf.java

@@ -0,0 +1,181 @@
+/**
+ * Copyright 2014 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 rx.operators;
+
+import java.util.*;
+import java.util.concurrent.TimeUnit;
+
+import org.openjdk.jmh.annotations.Benchmark;
+import org.openjdk.jmh.annotations.BenchmarkMode;
+import org.openjdk.jmh.annotations.Mode;
+import org.openjdk.jmh.annotations.OutputTimeUnit;
+import org.openjdk.jmh.annotations.Param;
+import org.openjdk.jmh.annotations.Scope;
+import org.openjdk.jmh.annotations.Setup;
+import org.openjdk.jmh.annotations.State;
+import org.openjdk.jmh.infra.Blackhole;
+
+import rx.Observable;
+import rx.functions.Func1;
+import rx.jmh.LatchedObserver;
+
+/**
+ * Benchmark ConcatMapIterable.
+ * <p>
+ * gradlew benchmarks "-Pjmh=-f 1 -tu s -bm thrpt -wi 5 -i 5 -r 1 .*ConcatMapInterablePerf.*"
+ * <p>
+ * gradlew benchmarks "-Pjmh=-f 1 -tu ns -bm avgt -wi 5 -i 5 -r 1 .*ConcatMapInterablePerf.*"
+ */
+@BenchmarkMode(Mode.Throughput)
+@OutputTimeUnit(TimeUnit.SECONDS)
+@State(Scope.Thread)
+public class ConcatMapInterablePerf {
+
+    @Param({"1", "10", "100", "1000", "10000", "100000", "1000000"})
+    public int count;
+    
+    Observable<Integer> justPlain;
+    
+    Observable<Integer> justIterable;
+
+    Observable<Integer> rangePlain;
+    
+    Observable<Integer> rangeIterable;
+
+    Observable<Integer> xrangePlain;
+    
+    Observable<Integer> xrangeIterable;
+
+    Observable<Integer> chainPlain;
+    
+    Observable<Integer> chainIterable;
+
+    @Setup
+    public void setup() {
+        Integer[] values = new Integer[count];
+        for (int i = 0; i < count; i++) {
+            values[i] = i;
+        }
+        
+        int c = 1000000 / count;
+        Integer[] xvalues = new Integer[c];
+        for (int i = 0; i < c; i++) {
+            xvalues[i] = i;
+        }
+        
+        Observable<Integer> source = Observable.from(values);
+
+        justPlain = source.concatMap(new Func1<Integer, Observable<Integer>>() {
+            @Override
+            public Observable<Integer> call(Integer v) {
+                return Observable.just(v);
+            }
+        });
+        justIterable = source.concatMapIterable(new Func1<Integer, Iterable<Integer>>() {
+            @Override
+            public Iterable<Integer> call(Integer v) {
+                return Collections.singleton(v);
+            }
+        });
+
+        final Observable<Integer> range = Observable.range(1, 2);
+        final List<Integer> xrange = Arrays.asList(1, 2);
+        
+        rangePlain = source.concatMap(new Func1<Integer, Observable<Integer>>() {
+            @Override
+            public Observable<Integer> call(Integer v) {
+                return range;
+            }
+        });
+        rangeIterable = source.concatMapIterable(new Func1<Integer, Iterable<Integer>>() {
+            @Override
+            public Iterable<Integer> call(Integer v) {
+                return xrange;
+            }
+        });
+        
+        final Observable<Integer> xsource = Observable.from(xvalues);
+        final List<Integer> xvaluesList = Arrays.asList(xvalues);
+        
+        xrangePlain = source.concatMap(new Func1<Integer, Observable<Integer>>() {
+            @Override
+            public Observable<Integer> call(Integer v) {
+                return xsource;
+            }
+        });
+        xrangeIterable = source.concatMapIterable(new Func1<Integer, Iterable<Integer>>() {
+            @Override
+            public Iterable<Integer> call(Integer v) {
+                return xvaluesList;
+            }
+        });
+
+        chainPlain = xrangePlain.concatMap(new Func1<Integer, Observable<Integer>>() {
+            @Override
+            public Observable<Integer> call(Integer v) {
+                return Observable.just(v);
+            }
+        });
+        chainIterable = xrangeIterable.concatMapIterable(new Func1<Integer, Iterable<Integer>>() {
+            @Override
+            public Iterable<Integer> call(Integer v) {
+                return Collections.singleton(v);
+            }
+        });
+    }
+    
+    @Benchmark
+    public void justPlain(Blackhole bh) {
+        justPlain.subscribe(new LatchedObserver<Integer>(bh));
+    }
+
+    @Benchmark
+    public void justIterable(Blackhole bh) {
+        justIterable.subscribe(new LatchedObserver<Integer>(bh));
+    }
+
+    @Benchmark
+    public void rangePlain(Blackhole bh) {
+        rangePlain.subscribe(new LatchedObserver<Integer>(bh));
+    }
+
+    @Benchmark
+    public void rangeIterable(Blackhole bh) {
+        rangeIterable.subscribe(new LatchedObserver<Integer>(bh));
+    }
+
+    @Benchmark
+    public void xrangePlain(Blackhole bh) {
+        xrangePlain.subscribe(new LatchedObserver<Integer>(bh));
+    }
+
+    @Benchmark
+    public void xrangeIterable(Blackhole bh) {
+        xrangeIterable.subscribe(new LatchedObserver<Integer>(bh));
+    }
+
+    @Benchmark
+    public void chainPlain(Blackhole bh) {
+        chainPlain.subscribe(new LatchedObserver<Integer>(bh));
+    }
+
+    @Benchmark
+    public void chainIterable(Blackhole bh) {
+        chainIterable.subscribe(new LatchedObserver<Integer>(bh));
+    }
+
+}