2.x: Add PublishProcessor JMH perf comparison (#5675)

build.gradle

@@ -53,7 +53,7 @@ targetCompatibility = JavaVersion.VERSION_1_6
 def junitVersion = "4.12"
 def reactiveStreamsVersion = "1.0.1"
 def mockitoVersion = "2.1.0"
-def jmhVersion = "1.16"
+def jmhLibVersion = "1.19"
 def testNgVersion = "6.11"
 
 // --------------------------------------
@@ -192,8 +192,9 @@ publishing.publications.all {
 }
 
 jmh {
-    jmhVersion = "1.19"
+    jmhVersion = jmhLibVersion
     humanOutputFile = null
+    includeTests = false
 
     if (project.hasProperty("jmh")) {
         include = ".*" + project.jmh + ".*"

src/jmh/java/io/reactivex/PerfBoundedSubscriber.java

@@ -0,0 +1,56 @@
+/**
+ * Copyright (c) 2016-present, RxJava Contributors.
+ *
+ * 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.concurrent.CountDownLatch;
+
+import org.openjdk.jmh.infra.Blackhole;
+import org.reactivestreams.Subscription;
+
+/**
+ * Performance subscriber with a one-time request from the upstream.
+ */
+public class PerfBoundedSubscriber extends CountDownLatch implements FlowableSubscriber<Object> {
+
+    final Blackhole bh;
+
+    final long request;
+
+    public PerfBoundedSubscriber(Blackhole bh, long request) {
+        super(1);
+        this.bh = bh;
+        this.request = request;
+    }
+
+    @Override
+    public void onSubscribe(Subscription s) {
+        s.request(request);
+    }
+
+    @Override
+    public void onComplete() {
+        countDown();
+    }
+
+    @Override
+    public void onError(Throwable e) {
+        countDown();
+    }
+
+    @Override
+    public void onNext(Object t) {
+        bh.consume(t);
+    }
+
+}

src/jmh/java/io/reactivex/PublishProcessorPerf.java

@@ -0,0 +1,109 @@
+/**
+ * Copyright (c) 2016-present, RxJava Contributors.
+ *
+ * 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.concurrent.TimeUnit;
+
+import org.openjdk.jmh.annotations.*;
+import org.openjdk.jmh.infra.Blackhole;
+
+import io.reactivex.processors.PublishProcessor;
+import io.reactivex.subjects.PublishSubject;
+
+@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 PublishProcessorPerf {
+
+    PublishProcessor<Integer> unbounded;
+
+    PublishProcessor<Integer> bounded;
+
+    PublishSubject<Integer> subject;
+
+    @Setup
+    public void setup(Blackhole bh) {
+        unbounded = PublishProcessor.create();
+        unbounded.subscribe(new PerfConsumer(bh));
+
+        bounded = PublishProcessor.create();
+        bounded.subscribe(new PerfBoundedSubscriber(bh, 1000 * 1000));
+
+        subject = PublishSubject.create();
+        subject.subscribe(new PerfConsumer(bh));
+    }
+
+    @Benchmark
+    public void unbounded1() {
+        unbounded.onNext(1);
+    }
+
+    @Benchmark
+    public void unbounded1k() {
+        for (int i = 0; i < 1000; i++) {
+            unbounded.onNext(1);
+        }
+    }
+
+    @Benchmark
+    public void unbounded1m() {
+        for (int i = 0; i < 1000000; i++) {
+            unbounded.onNext(1);
+        }
+    }
+
+    @Benchmark
+    public void bounded1() {
+        bounded.onNext(1);
+    }
+
+
+    @Benchmark
+    public void bounded1k() {
+        for (int i = 0; i < 1000; i++) {
+            bounded.onNext(1);
+        }
+    }
+
+    @Benchmark
+    public void bounded1m() {
+        for (int i = 0; i < 1000000; i++) {
+            bounded.onNext(1);
+        }
+    }
+
+
+    @Benchmark
+    public void subject1() {
+        subject.onNext(1);
+    }
+
+
+    @Benchmark
+    public void subject1k() {
+        for (int i = 0; i < 1000; i++) {
+            subject.onNext(1);
+        }
+    }
+
+    @Benchmark
+    public void subject1m() {
+        for (int i = 0; i < 1000000; i++) {
+            subject.onNext(1);
+        }
+    }
+}