Merge pull request #3475 from akarnokd/FlatMapRangePerf1x

1.x: benchmark range + flatMap throughput.

Author: akarnokd

src/perf/java/rx/operators/FlatMapRangePerf.java

@@ -0,0 +1,73 @@
+/**
+ * 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.concurrent.TimeUnit;
+
+import org.openjdk.jmh.annotations.*;
+import org.openjdk.jmh.infra.Blackhole;
+
+import rx.Observable;
+import rx.functions.Func1;
+import rx.jmh.LatchedObserver;
+
+/**
+ * Benchmark typical atomic operations on volatile fields and AtomicXYZ classes.
+ * <p>
+ * gradlew benchmarks "-Pjmh=-f 1 -tu s -bm thrpt -wi 5 -i 5 -r 1 .*FlatMapRangePerf.*"
+ * <p>
+ * gradlew benchmarks "-Pjmh=-f 1 -tu ns -bm avgt -wi 5 -i 5 -r 1 .*FlatMapRangePerf.*"
+ */
+@BenchmarkMode(Mode.Throughput)
+@OutputTimeUnit(TimeUnit.SECONDS)
+@State(Scope.Thread)
+public class FlatMapRangePerf {
+    @Param({ "1", "10", "1000", "1000000" })
+    public int times;
+    
+    Observable<Integer> rangeFlatMapJust;
+    Observable<Integer> rangeFlatMapRange;
+    
+    @Setup
+    public void setup() {
+        Observable<Integer> range = Observable.range(1, times);
+        
+        rangeFlatMapJust = range.flatMap(new Func1<Integer, Observable<Integer>>() {
+            @Override
+            public Observable<Integer> call(Integer v) {
+                return Observable.just(v);
+            }
+        });
+        rangeFlatMapRange = range.flatMap(new Func1<Integer, Observable<Integer>>() {
+            @Override
+            public Observable<Integer> call(Integer v) {
+                return Observable.range(v, 2);
+            }
+        });
+    }
+    
+    @Benchmark
+    public void rangeFlatMapJust(Blackhole bh) {
+        rangeFlatMapJust.subscribe(new LatchedObserver<Object>(bh));
+    }
+
+    @Benchmark
+    public void rangeFlatMapRange(Blackhole bh) {
+        rangeFlatMapRange.subscribe(new LatchedObserver<Object>(bh));
+    }
+
+}