benchmarks: Delete SingleThreadBlockingQpsBenchmark

It is basically the same as TransportBenchmark without protobuf, smaller
payload, and only Netty. It does show latencies around 66 µs instead of
TransportBenchmark's 70 µs on my laptop, but a quick conversion of
TransportBenchmark to ByteBufOutputMarshaller made it 66 µs as well.

benchmarks/src/jmh/java/io/grpc/benchmarks/netty/SingleThreadBlockingQpsBenchmark.java

@@ -1,86 +0,0 @@
-/*
- * Copyright 2015 The gRPC Authors
- *
- * 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.grpc.benchmarks.netty;
-
-import io.grpc.CallOptions;
-import io.grpc.stub.ClientCalls;
-import io.netty.buffer.Unpooled;
-import org.openjdk.jmh.annotations.Benchmark;
-import org.openjdk.jmh.annotations.Fork;
-import org.openjdk.jmh.annotations.Level;
-import org.openjdk.jmh.annotations.Scope;
-import org.openjdk.jmh.annotations.Setup;
-import org.openjdk.jmh.annotations.State;
-import org.openjdk.jmh.annotations.TearDown;
-
-/**
- * Benchmark showing performance of a linear sequence of blocking calls in a single thread which
- * is the worst case for throughput. The benchmark permutes response payload size and
- * client inbound flow-control window size.
- */
-@State(Scope.Benchmark)
-@Fork(1)
-public class SingleThreadBlockingQpsBenchmark extends AbstractBenchmark {
-
-  /**
-   * Setup with direct executors, small payloads and the default flow control window.
-   */
-  @Setup(Level.Trial)
-  public void setup() throws Exception {
-    super.setup(ExecutorType.DIRECT,
-        ExecutorType.DIRECT,
-        MessageSize.SMALL,
-        MessageSize.SMALL,
-        FlowWindowSize.MEDIUM,
-        ChannelType.NIO,
-        1,
-        1);
-  }
-
-  /**
-   * Stop the server and client channels.
-   */
-  @Override
-  @TearDown(Level.Trial)
-  public void teardown() throws Exception {
-    Thread.sleep(5000);
-    super.teardown();
-  }
-
-  /**
-   * Issue a unary call and wait for the response.
-   */
-  @Benchmark
-  public Object blockingUnary() throws Exception {
-    return ClientCalls.blockingUnaryCall(
-        channels[0].newCall(unaryMethod, CallOptions.DEFAULT), Unpooled.EMPTY_BUFFER);
-  }
-
-  /**
-   * Useful for triggering a subset of the benchmark in a profiler.
-   */
-  public static void main(String[] argv) throws Exception {
-    SingleThreadBlockingQpsBenchmark bench = new SingleThreadBlockingQpsBenchmark();
-    bench.setup();
-    for  (int i = 0; i < 10000; i++) {
-      bench.blockingUnary();
-    }
-    Thread.sleep(30000);
-    bench.teardown();
-    System.exit(0);
-  }
-}