Perf with JMH

build.gradle

@@ -44,9 +44,19 @@ subprojects {
 		//include /src/examples folder
         examples
 		//include /src/perf folder
-		// perf //-> Not working so commented out
+        perf {
+            java {
+                srcDir 'src/perf/java'
+                compileClasspath += main.output
+                runtimeClasspath += main.output
+            }
+        }
     }
-
+
+    dependencies {
+        perfCompile 'org.openjdk.jmh:jmh-core:0.2'
+    }
+
     tasks.build { 
 		//include 'examples' in build task
         dependsOn(examplesClasses)
@@ -58,6 +68,7 @@ subprojects {
         classpath {  
             // include 'provided' dependencies on the classpath
             plusConfigurations += configurations.provided
+            plusConfigurations += configurations.perfCompile
 
             downloadSources = true
             downloadJavadoc = true
@@ -68,6 +79,8 @@ subprojects {
         module {
             // include 'provided' dependencies on the classpath
             scopes.PROVIDED.plus += configurations.provided
+            // TODO not sure what to add it to
+            //scopes.PROVIDED.plus += configurations.perfCompile
         }
     }
 }

rxjava-core/build.gradle

@@ -1,5 +1,6 @@
 apply plugin: 'maven'
 apply plugin: 'osgi'
+apply plugin:'application'
 
 sourceCompatibility = JavaVersion.VERSION_1_6
 targetCompatibility = JavaVersion.VERSION_1_6
@@ -31,3 +32,9 @@ jar {
     }
 }
 
+task time(type:JavaExec) {
+    classpath = sourceSets.perf.runtimeClasspath
+    group 'Application'
+    description 'Execute the calipser benchmark timing of Rx'
+    main 'rx.operators.ObservableBenchmark'
+}

rxjava-core/src/perf/java/rx/operators/ObservableBenchmark.java

@@ -0,0 +1,123 @@
+package rx.operators;
+
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.openjdk.jmh.annotations.GenerateMicroBenchmark;
+import org.openjdk.jmh.runner.Runner;
+import org.openjdk.jmh.runner.RunnerException;
+import org.openjdk.jmh.runner.options.Options;
+import org.openjdk.jmh.runner.options.OptionsBuilder;
+
+import rx.Observable;
+import rx.Observable.OnSubscribe;
+import rx.Observer;
+import rx.util.functions.Func1;
+
+public class ObservableBenchmark {
+
+    @GenerateMicroBenchmark
+    public void timeBaseline() {
+        observableOfInts.subscribe(newObserver());
+        awaitAllObservers();
+    }
+
+    @GenerateMicroBenchmark
+    public int timeMapIterate() {
+        int x = 0;
+        for (int j = 0; j < intValues.length; j++) {
+            // use hash code to make sure the JIT doesn't optimize too much and remove all of
+            // our code.
+            x |= ident.call(intValues[j]).hashCode();
+        }
+        return x;
+    }
+
+    @GenerateMicroBenchmark
+    public void timeMap() {
+        timeOperator(new OperatorMap<Integer, Object>(ident));
+    }
+
+    /**************************************************************************
+     * Below is internal stuff to avoid object allocation and time overhead of anything that isn't
+     * being tested.
+     * 
+     * @throws RunnerException
+     **************************************************************************/
+
+    public static void main(String[] args) throws RunnerException {
+        Options opt = new OptionsBuilder()
+                .include(ObservableBenchmark.class.getName()+".*")
+                .forks(1)
+                .build();
+
+        new Runner(opt).run();
+    }
+
+    private void timeOperator(Operator<Object, Integer> op) {
+        observableOfInts.lift(op).subscribe(newObserver());
+        awaitAllObservers();
+    }
+
+    private final static AtomicInteger outstanding = new AtomicInteger(0);
+    private final static CountDownLatch latch = new CountDownLatch(1);
+
+    private static <T> Observer<T> newObserver() {
+        outstanding.incrementAndGet();
+        return new Observer<T>() {
+            @Override
+            public void onCompleted() {
+                int left = outstanding.decrementAndGet();
+                if (left == 0) {
+                    latch.countDown();
+                }
+            }
+
+            @Override
+            public void onError(Throwable e) {
+                int left = outstanding.decrementAndGet();
+                if (left == 0) {
+                    latch.countDown();
+                }
+            }
+
+            @Override
+            public void onNext(T t) {
+                // do nothing
+            }
+        };
+    }
+
+    private static void awaitAllObservers() {
+        try {
+            latch.await();
+        } catch (InterruptedException e) {
+            return;
+        }
+    }
+
+    private static final Integer[] intValues = new Integer[1000];
+    static {
+        for (int i = 0; i < intValues.length; i++) {
+            intValues[i] = i;
+        }
+    }
+
+    private static final Observable<Integer> observableOfInts = Observable.create(new OnSubscribe<Integer>() {
+        @Override
+        public void call(Observer<? super Integer> o) {
+            for (int i = 0; i < intValues.length; i++) {
+                if (o.isUnsubscribed())
+                    return;
+                o.onNext(intValues[i]);
+            }
+            o.onCompleted();
+        }
+    });
+    private static final Func1<Integer, Object> ident = new Func1<Integer, Object>() {
+        @Override
+        public Object call(Integer t) {
+            return t;
+        }
+    };
+}