Merge pull request #2911 from akarnokd/OperatorPublishPerf

OperatorPublish benchmark

src/perf/java/rx/operators/OperatorPublishPerf.java

@@ -0,0 +1,159 @@
+/**
+ * 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.*;
+
+import org.openjdk.jmh.annotations.*;
+import org.openjdk.jmh.infra.Blackhole;
+
+import rx.*;
+import rx.Observable;
+import rx.functions.Action0;
+import rx.observables.ConnectableObservable;
+import rx.schedulers.Schedulers;
+
+/**
+ * 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 .*OperatorPublishPerf.*"
+ * <p>
+ * gradlew benchmarks "-Pjmh=-f 1 -tu ns -bm avgt -wi 5 -i 5 -r 1 .*OperatorPublishPerf.*"
+ */
+@BenchmarkMode(Mode.Throughput)
+@OutputTimeUnit(TimeUnit.SECONDS)
+@State(Scope.Thread)
+public class OperatorPublishPerf {
+    static final class SharedLatchObserver extends Subscriber<Integer> {
+        final CountDownLatch cdl;
+        final int batchFrequency;
+        final Blackhole bh;
+        int received;
+        public SharedLatchObserver(CountDownLatch cdl, int batchFrequency, Blackhole bh) {
+            this.cdl = cdl;
+            this.batchFrequency = batchFrequency;
+            this.bh = bh;
+        }
+        @Override
+        public void onStart() {
+            request(batchFrequency);
+        }
+        @Override
+        public void onNext(Integer t) {
+            if (bh != null) {
+                bh.consume(t);
+            }
+            if (++received == batchFrequency) {
+                received = 0;
+                request(batchFrequency);
+            }
+        }
+        @Override
+        public void onError(Throwable e) {
+            e.printStackTrace();
+            cdl.countDown();
+        }
+        @Override
+        public void onCompleted() {
+            cdl.countDown();
+        }
+    }
+
+
+    /** How long the range should be. */
+    @Param({"1", "1000", "1000000"})
+    private int size;
+    /** Should children use observeOn? */
+    @Param({"false", "true"})
+    private boolean async;
+    /** Number of child subscribers. */
+    @Param({"0", "1", "2", "3", "4", "5"})
+    private int childCount;
+    /** How often the child subscribers should re-request. */
+    @Param({"1", "2", "4", "8", "16", "32", "64"})
+    private int batchFrequency;
+
+    private ConnectableObservable<Integer> source;
+    private Observable<Integer> observable;
+    private CyclicBarrier sourceDone;
+    @Setup
+    public void setup() {
+        List<Integer> list = new ArrayList<Integer>();
+        for (int i = 0; i < size; i++) {
+            list.add(i);
+        }
+        Observable<Integer> src = Observable.from(list);
+        if (childCount == 0) {
+            sourceDone = new CyclicBarrier(2);
+            src = src
+                // for childCount == 0, make sure we measure how fast the source is depleted
+                .doOnCompleted(new Action0() {
+                    @Override
+                    public void call() {
+                        try {
+                            sourceDone.await(2, TimeUnit.SECONDS);
+                        } catch (InterruptedException ex) {
+                            // ignored
+                        } catch (BrokenBarrierException ex) {
+                            // ignored
+                        } catch (TimeoutException ex) {
+                            // ignored
+                        }
+                    }
+                });
+        }
+        source = src.publish();
+        observable = async ? source.observeOn(Schedulers.computation()) : source;
+    }
+
+    @Benchmark
+    public void benchmark(Blackhole bh) throws InterruptedException, 
+            TimeoutException, BrokenBarrierException {
+        CountDownLatch completion = null;
+        int cc = childCount;
+
+        if (cc > 0) {
+            completion = new CountDownLatch(cc);
+            Observable<Integer> o = observable;
+            for (int i = 0; i < childCount; i++) {
+                o.subscribe(new SharedLatchObserver(completion, batchFrequency, bh));
+            }
+        }
+
+        Subscription s = source.connect();
+
+        if (cc == 0) {
+            sourceDone.await(2, TimeUnit.SECONDS);
+        }
+        if (completion != null && !completion.await(2, TimeUnit.SECONDS)) {
+            throw new RuntimeException("Source hung!");
+        }
+        s.unsubscribe();
+    }
+//    public static void main(String[] args) throws Exception {
+//        OperatorPublishPerf o = new OperatorPublishPerf();
+//        o.async = true;
+//        o.batchFrequency = 1;
+//        o.childCount = 1;
+//        o.size = 1000000;
+//        o.setup();
+//        for (int j = 0; j < 1000; j++) {
+//            o.benchmark(null);
+//        }
+//    }
+}