8234812: Add micros for DatagramChannel send/receive

Benchmarks for the DatagramChannel::send and DatagramChannel::receive methods

Reviewed-by: alanb, chegar

test/micro/org/openjdk/bench/java/nio/DatagramChannelSendReceive.java

@@ -0,0 +1,154 @@
+/*
+ * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package org.openjdk.bench.java.net;
+
+import org.openjdk.jmh.annotations.Benchmark;
+import org.openjdk.jmh.annotations.BenchmarkMode;
+import org.openjdk.jmh.annotations.Mode;
+import org.openjdk.jmh.annotations.OutputTimeUnit;
+import org.openjdk.jmh.annotations.Param;
+import org.openjdk.jmh.annotations.Scope;
+import org.openjdk.jmh.annotations.Setup;
+import org.openjdk.jmh.annotations.State;
+import org.openjdk.jmh.annotations.TearDown;
+
+import java.net.InetSocketAddress;
+import java.nio.ByteBuffer;
+import java.nio.channels.DatagramChannel;
+import java.io.IOException;
+import java.net.InetAddress;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * Benchmark DatagramChannel send/receive.
+ */
+
+@BenchmarkMode(Mode.AverageTime)
+@OutputTimeUnit(TimeUnit.MICROSECONDS)
+@State(Scope.Thread)
+public class DatagramChannelSendReceive {
+
+    private int counter = 0;
+
+    private ByteBuffer buf;
+    private DatagramChannel channel1, channel2, connectedWriteChannel,
+            connectedReadChannel, multipleReceiveChannel, multipleSendChannel;
+    private DatagramChannel[] dca;
+
+    @Param({"128", "512", "2048", "8192", "32768"})
+    public int size;
+    @Param({"4"})
+    public int channelCount;
+    @Param({"true"})
+    public boolean useDirectBuffer;
+
+    @Setup
+    public void setUp() throws IOException {
+        buf = (useDirectBuffer) ? ByteBuffer.allocateDirect(size) :
+                ByteBuffer.allocate(size);
+        buf.clear();
+
+        InetSocketAddress addr =
+                new InetSocketAddress(InetAddress.getLoopbackAddress(), 0);
+
+        // single send - same socket; different sockets
+        channel1 = DatagramChannel.open().bind(addr);
+        channel2 = DatagramChannel.open().bind(addr);
+
+        // connected read / write
+        connectedWriteChannel = DatagramChannel.open().bind(addr);
+        connectedReadChannel = DatagramChannel.open().bind(addr);
+        connectedWriteChannel.connect(connectedReadChannel.getLocalAddress());
+        connectedReadChannel.connect(connectedWriteChannel.getLocalAddress());
+
+        // multiple senders / multiple receivers
+        dca = new DatagramChannel[channelCount];
+        for (int i = 0; i < dca.length; i++) {
+            dca[i] = DatagramChannel.open().bind(addr);
+        }
+        multipleReceiveChannel = DatagramChannel.open().bind(addr);
+        multipleSendChannel = DatagramChannel.open().bind(addr);
+    }
+
+    // same sender receiver
+    @Benchmark
+    public void sendReceiveSingleSocket() throws IOException {
+        buf.clear();
+        channel1.send(buf, channel1.getLocalAddress());
+        buf.clear();
+        channel1.receive(buf);
+    }
+
+    // single sender, single receiver
+    @Benchmark
+    public void sendReceive() throws IOException {
+        buf.clear();
+        channel1.send(buf, channel2.getLocalAddress());
+        buf.clear();
+        channel2.receive(buf);
+    }
+
+    // connected sender receiver
+    @Benchmark
+    public void sendReceiveConnected() throws IOException {
+        buf.clear();
+        connectedWriteChannel.write(buf);
+        buf.clear();
+        connectedReadChannel.read(buf);
+    }
+
+    // multiple senders, single receiver
+    @Benchmark
+    public void sendMultiple() throws IOException {
+        int i = counter;
+        buf.clear();
+        dca[i].send(buf, multipleReceiveChannel.getLocalAddress());
+        buf.clear();
+        multipleReceiveChannel.receive(buf);
+        counter = ++i % dca.length;
+    }
+
+    // single sender, multiple receivers
+    @Benchmark
+    public void receiveMultiple() throws IOException {
+        int i = counter;
+        buf.clear();
+        multipleSendChannel.send(buf, dca[i].getLocalAddress());
+        buf.clear();
+        dca[i].receive(buf);
+        counter = ++i % dca.length;
+    }
+
+    @TearDown
+    public void tearDown() throws IOException {
+        channel1.close();
+        channel2.close();
+        connectedWriteChannel.close();
+        connectedReadChannel.close();
+        multipleReceiveChannel.close();
+        multipleSendChannel.close();
+        for (DatagramChannel dc : dca) {
+            dc.close();
+        }
+    }
+}