Move jmh benchmarks to their respective modules

The benchmarks should be close to the code they're benchmarking, like
we do with tests.

This includes a bugfix to SerializingExecutorBenchmark to let it run.

The io.grpc.benchmarks.netty benchmarks in benchmarks/ depend on
ByteBufOutputMarshaller from benchmarks's main, so they were not moved.

benchmarks/build.gradle

@@ -1,20 +1,12 @@
 buildscript {
     repositories {
         mavenCentral()
-        maven {
-            url "https://plugins.gradle.org/m2/"
-        }
     }
     dependencies {
-        classpath libraries.math
         classpath libraries.protobuf_plugin
     }
 }
 
-plugins {
-  id "me.champeau.gradle.jmh" version "0.4.4"
-}
-
 apply plugin: 'application'
 
 description = "grpc Benchmarks"
@@ -23,11 +15,10 @@ startScripts.enabled = false
 run.enabled = false
 
 jmh {
-    jmhVersion = '1.19'
-    warmupIterations = 10
-    iterations = 10
-    fork = 1
     jvmArgs = "-server -Xms2g -Xmx2g"
+    // Workaround
+    // https://github.com/melix/jmh-gradle-plugin/issues/97#issuecomment-316664026
+    includeTests = true
 }
 
 dependencies {
@@ -50,10 +41,6 @@ compileJava {
   options.compilerArgs += ["-Xep:JavaLangClash:OFF"]
 }
 
-compileJmhJava {
-  options.compilerArgs = compileJava.options.compilerArgs
-}
-
 configureProtoCompilation()
 
 def vmArgs = [

build.gradle

@@ -10,6 +10,7 @@ buildscript {
     classpath 'com.google.gradle:osdetector-gradle-plugin:1.4.0'
     classpath 'ru.vyarus:gradle-animalsniffer-plugin:1.4.0'
     classpath 'net.ltgt.gradle:gradle-errorprone-plugin:0.0.11'
+    classpath "me.champeau.gradle:jmh-gradle-plugin:0.4.4"
   }
 }
 
@@ -21,6 +22,7 @@ subprojects {
     apply plugin: "signing"
     apply plugin: "jacoco"
 
+    apply plugin: "me.champeau.gradle.jmh"
     apply plugin: "com.google.osdetector"
     // The plugin only has an effect if a signature is specified
     apply plugin: "ru.vyarus.animalsniffer"
@@ -57,7 +59,7 @@ subprojects {
         mavenLocal()
     }
 
-    [compileJava, compileTestJava].each() {
+    [compileJava, compileTestJava, compileJmhJava].each() {
         it.options.compilerArgs += ["-Xlint:all", "-Xlint:-options", "-Xlint:-path"]
         it.options.encoding = "UTF-8"
         if (rootProject.hasProperty('failOnWarnings') && rootProject.failOnWarnings.toBoolean()) {
@@ -165,7 +167,7 @@ subprojects {
             }
           }
 
-          [compileJava, compileTestJava].each() {
+          [compileJava, compileTestJava, compileJmhJava].each() {
             // Protobuf-generated code produces some warnings.
             // https://github.com/google/protobuf/issues/2718
             it.options.compilerArgs += ["-Xlint:-cast", "-Xep:MissingOverride:OFF",
@@ -227,6 +229,9 @@ subprojects {
 
         // Configuration for modules that use Jetty ALPN agent
         alpnagent libraries.jetty_alpn_agent
+
+        jmh 'org.openjdk.jmh:jmh-core:1.19',
+            'org.openjdk.jmh:jmh-generator-bytecode:1.19'
     }
 
     signing {
@@ -261,6 +266,16 @@ subprojects {
         source = fileTree(dir: "src/test", include: "**/*.java")
     }
 
+    jmh {
+        warmupIterations = 10
+        iterations = 10
+        fork = 1
+        // None of our benchmarks need the tests, and we have pseudo-circular
+        // dependencies that break when including them. (context's testCompile
+        // depends on core; core's testCompile depends on testing)
+        includeTests = false
+    }
+
     task javadocJar(type: Jar) {
         classifier = 'javadoc'
         from javadoc

context/src/jmh/java/io/grpc/AttachDetachBenchmark.java

@@ -14,9 +14,8 @@
  * limitations under the License.
  */
 
-package io.grpc.context;
+package io.grpc;
 
-import io.grpc.Context;
 import io.grpc.Context.Key;
 import java.util.concurrent.TimeUnit;
 import org.openjdk.jmh.annotations.Benchmark;

context/src/jmh/java/io/grpc/ReadBenchmark.java

@@ -14,9 +14,8 @@
  * limitations under the License.
  */
 
-package io.grpc.context;
+package io.grpc;
 
-import io.grpc.Context;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.concurrent.TimeUnit;

context/src/jmh/java/io/grpc/WriteBenchmark.java

@@ -14,9 +14,8 @@
  * limitations under the License.
  */
 
-package io.grpc.context;
+package io.grpc;
 
-import io.grpc.Context;
 import java.util.concurrent.TimeUnit;
 import org.openjdk.jmh.annotations.Benchmark;
 import org.openjdk.jmh.annotations.BenchmarkMode;

core/build.gradle

@@ -18,3 +18,8 @@ javadoc {
     exclude 'io/grpc/Internal?*.java'
     exclude 'io/grpc/internal/**'
 }
+
+animalsniffer {
+    // Don't check sourceSets.jmh
+    sourceSets = [sourceSets.main, sourceSets.test]
+}

core/src/jmh/java/io/grpc/CallOptionsBenchmark.java

@@ -14,9 +14,8 @@
  * limitations under the License.
  */
 
-package io.grpc.benchmarks;
+package io.grpc;
 
-import io.grpc.CallOptions;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;

core/src/jmh/java/io/grpc/internal/SerializingExecutorBenchmark.java

@@ -18,6 +18,7 @@ package io.grpc.internal;
 
 import java.util.concurrent.Executor;
 import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
 import java.util.concurrent.Phaser;
 import java.util.concurrent.TimeUnit;
 import org.openjdk.jmh.annotations.Benchmark;
@@ -39,7 +40,7 @@ import org.openjdk.jmh.annotations.TearDown;
 @State(Scope.Thread)
 public class SerializingExecutorBenchmark {
 
-  private ExecutorService executorService;
+  private ExecutorService executorService = Executors.newSingleThreadExecutor();
   private Executor executor = new SerializingExecutor(executorService);
 
   private static class IncrRunnable implements Runnable {

netty/build.gradle

@@ -29,3 +29,9 @@ project.sourceSets {
     }
 }
 
+
+jmh {
+    // Workaround
+    // https://github.com/melix/jmh-gradle-plugin/issues/97#issuecomment-316664026
+    includeTests = true
+}