1.x: Single performance measurements

src/perf/java/rx/SingleSourcePerf.java

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+/**
+ * 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;
+
+import java.util.concurrent.*;
+
+import org.openjdk.jmh.annotations.*;
+import org.openjdk.jmh.infra.Blackhole;
+
+import rx.functions.Func1;
+import rx.schedulers.Schedulers;
+
+/**
+ * Benchmark Single.
+ * <p>
+ * gradlew benchmarks "-Pjmh=-f 1 -tu s -bm thrpt -wi 5 -i 5 -r 1 .*SingleSourcePerf.*"
+ * <p>
+ * gradlew benchmarks "-Pjmh=-f 1 -tu ns -bm avgt -wi 5 -i 5 -r 1 .*SingleSourcePerf.*"
+ */
+@BenchmarkMode(Mode.Throughput)
+@OutputTimeUnit(TimeUnit.SECONDS)
+@State(Scope.Thread)
+public class SingleSourcePerf {
+
+    Single<Integer> source;
+
+    Single<Integer> flatmapped;
+
+    Single<Integer> flatmappedConst;
+
+    Single<Integer> sourceObserveOn;
+
+    Single<Integer> sourceSubscribeOn;
+
+    Single<Integer> sourceObserveOnExecutor;
+
+    Single<Integer> sourceSubscribeOnExecutor;
+
+    Single<Integer> sourceObserveOnScheduledExecutor;
+
+    Single<Integer> sourceSubscribeOnScheduledExecutor;
+
+//    Single<Integer> sourceObserveOnFJ;
+
+//    Single<Integer> sourceSubscribeOnFJ;
+
+    ScheduledExecutorService scheduledExecutor;
+
+    ExecutorService executor;
+
+    @Setup
+    public void setup() {
+        source = Single.just(1);
+
+        flatmapped = source.flatMap(new Func1<Integer, Single<Integer>>() {
+            @Override
+            public Single<Integer> call(Integer t) {
+                return Single.just(t);
+            }
+        });
+
+        flatmapped = source.flatMap(new Func1<Integer, Single<Integer>>() {
+            @Override
+            public Single<Integer> call(Integer t) {
+                return source;
+            }
+        });
+
+        sourceObserveOn = source.observeOn(Schedulers.computation());
+
+        sourceSubscribeOn = source.subscribeOn(Schedulers.computation());
+
+        // ----------
+
+        scheduledExecutor = Executors.newScheduledThreadPool(1);
+
+        Scheduler s = Schedulers.from(scheduledExecutor);
+
+        sourceObserveOnScheduledExecutor = source.observeOn(s);
+
+        sourceSubscribeOnScheduledExecutor = source.subscribeOn(s);
+
+        // ----------
+
+        executor = Executors.newSingleThreadExecutor();
+
+        Scheduler se = Schedulers.from(executor);
+
+        sourceObserveOnExecutor = source.observeOn(se);
+
+        sourceSubscribeOnExecutor = source.subscribeOn(se);
+
+        // --------
+
+//        Scheduler fj = Schedulers.from(ForkJoinPool.commonPool());
+
+//        sourceObserveOnFJ = source.observeOn(fj);
+
+//        sourceSubscribeOnFJ = source.subscribeOn(fj);
+    }
+
+    @TearDown
+    public void teardown() {
+        scheduledExecutor.shutdownNow();
+
+        executor.shutdownNow();
+    }
+
+    static final class PlainSingleSubscriber extends SingleSubscriber<Object> {
+        final Blackhole bh;
+
+        public PlainSingleSubscriber(Blackhole bh) {
+            this.bh = bh;
+        }
+
+        @Override
+        public void onSuccess(Object value) {
+            bh.consume(value);
+        }
+
+        @Override
+        public void onError(Throwable error) {
+            bh.consume(error);
+        }
+    }
+
+    static final class LatchedSingleSubscriber extends SingleSubscriber<Object> {
+        final Blackhole bh;
+
+        final CountDownLatch cdl;
+
+        public LatchedSingleSubscriber(Blackhole bh) {
+            this.bh = bh;
+            this.cdl = new CountDownLatch(1);
+        }
+
+        @Override
+        public void onSuccess(Object value) {
+            bh.consume(value);
+            cdl.countDown();
+        }
+
+        @Override
+        public void onError(Throwable error) {
+            bh.consume(error);
+            cdl.countDown();
+        }
+
+        public void await() {
+            try {
+                cdl.await();
+            } catch (InterruptedException ex) {
+                throw new RuntimeException(ex);
+            }
+        }
+
+        public void awaitSpin() {
+            while (cdl.getCount() != 0L) ;
+        }
+    }
+
+    @Benchmark
+    public void direct(Blackhole bh) {
+        source.subscribe(new PlainSingleSubscriber(bh));
+    }
+
+    @Benchmark
+    public void flatmap(Blackhole bh) {
+        flatmapped.subscribe(new PlainSingleSubscriber(bh));
+    }
+
+    @Benchmark
+    public void flatmapConst(Blackhole bh) {
+        flatmapped.subscribe(new PlainSingleSubscriber(bh));
+    }
+
+    @Benchmark
+    public void observeOn(Blackhole bh) {
+        LatchedSingleSubscriber o = new LatchedSingleSubscriber(bh);
+
+        sourceObserveOn.subscribe(o);
+
+        o.awaitSpin();
+    }
+
+    @Benchmark
+    public void observeOnExec(Blackhole bh) {
+        LatchedSingleSubscriber o = new LatchedSingleSubscriber(bh);
+
+        sourceObserveOnExecutor.subscribe(o);
+
+        o.awaitSpin();
+    }
+
+    @Benchmark
+    public void subscribeOn(Blackhole bh) {
+        LatchedSingleSubscriber o = new LatchedSingleSubscriber(bh);
+
+        sourceSubscribeOn.subscribe(o);
+
+        o.awaitSpin();
+    }
+
+    @Benchmark
+    public void subscribeOnExec(Blackhole bh) {
+        LatchedSingleSubscriber o = new LatchedSingleSubscriber(bh);
+
+        sourceSubscribeOnExecutor.subscribe(o);
+
+        o.awaitSpin();
+    }
+
+    @Benchmark
+    public void subscribeOnSchExec(Blackhole bh) {
+        LatchedSingleSubscriber o = new LatchedSingleSubscriber(bh);
+
+        sourceSubscribeOnScheduledExecutor.subscribe(o);
+
+        o.awaitSpin();
+    }
+
+//    @Benchmark
+//    public void subscribeOnFJ(Blackhole bh) {
+//        LatchedSingleSubscriber o = new LatchedSingleSubscriber(bh);
+//        
+//        sourceSubscribeOnFJ.subscribe(o);
+//        
+//        o.awaitSpin();
+//    }
+
+    @Benchmark
+    public void observeOnSchExec(Blackhole bh) {
+        LatchedSingleSubscriber o = new LatchedSingleSubscriber(bh);
+
+        sourceObserveOnScheduledExecutor.subscribe(o);
+
+        o.awaitSpin();
+    }
+
+//    @Benchmark
+//    public void observeOnFJ(Blackhole bh) {
+//        LatchedSingleSubscriber o = new LatchedSingleSubscriber(bh);
+//        
+//        sourceObserveOnFJ.subscribe(o);
+//        
+//        o.awaitSpin();
+//    }
+
+}