Simple EA test

FooBenchmark.java

package io.grpc;

import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.CompilerControl;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.State;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

/**
 * Created by buchgr on 9/19/16.
 */
@State(Scope.Thread)
public class FooBenchmark {

  private final List<String> list = new ArrayList<String>(1024);

  @Benchmark
  public Iterator<String> baseline() {
    return list.iterator();
  }

  @Benchmark
  public void no_alloc() {
    no_alloc0();
  }

  @Benchmark
  public void no_alloc_but_alloc() {
    no_alloc1();
  }

  Iterator<String> no_alloc0() {
    return list.iterator();
  }

  @CompilerControl(CompilerControl.Mode.DONT_INLINE)
  Iterator<String> no_alloc1() {
    return list.iterator();
  }
}

/**
FooBenchmark.baseline                                             thrpt   10   183072649.740 ±  4957161.238   ops/s
FooBenchmark.baseline:·gc.alloc.rate                              thrpt   10        5585.307 ±      152.000  MB/sec
FooBenchmark.baseline:·gc.alloc.rate.norm                         thrpt   10          32.000 ±        0.001    B/op
FooBenchmark.baseline:·gc.churn.PS_Eden_Space                     thrpt   10        5635.544 ±      497.420  MB/sec
FooBenchmark.baseline:·gc.churn.PS_Eden_Space.norm                thrpt   10          32.276 ±        2.286    B/op
FooBenchmark.baseline:·gc.churn.PS_Survivor_Space                 thrpt   10           0.118 ±        0.066  MB/sec
FooBenchmark.baseline:·gc.churn.PS_Survivor_Space.norm            thrpt   10           0.001 ±        0.001    B/op
FooBenchmark.baseline:·gc.count                                   thrpt   10          83.000                 counts
FooBenchmark.baseline:·gc.time                                    thrpt   10          34.000                     ms
FooBenchmark.no_alloc                                             thrpt   10  1478470149.525 ± 42938626.179   ops/s
FooBenchmark.no_alloc:·gc.alloc.rate                              thrpt   10           0.002 ±        0.005  MB/sec
FooBenchmark.no_alloc:·gc.alloc.rate.norm                         thrpt   10          ≈ 10⁻⁶                   B/op
FooBenchmark.no_alloc:·gc.count                                   thrpt   10             ≈ 0                 counts
FooBenchmark.no_alloc_but_alloc                                   thrpt   10   155216657.107 ±  7920942.906   ops/s
FooBenchmark.no_alloc_but_alloc:·gc.alloc.rate                    thrpt   10        4735.646 ±      241.374  MB/sec
FooBenchmark.no_alloc_but_alloc:·gc.alloc.rate.norm               thrpt   10          32.000 ±        0.001    B/op
FooBenchmark.no_alloc_but_alloc:·gc.churn.PS_Eden_Space           thrpt   10        4755.211 ±      487.553  MB/sec
FooBenchmark.no_alloc_but_alloc:·gc.churn.PS_Eden_Space.norm      thrpt   10          32.129 ±        2.789    B/op
FooBenchmark.no_alloc_but_alloc:·gc.churn.PS_Survivor_Space       thrpt   10           0.078 ±        0.040  MB/sec
FooBenchmark.no_alloc_but_alloc:·gc.churn.PS_Survivor_Space.norm  thrpt   10           0.001 ±        0.001    B/op
FooBenchmark.no_alloc_but_alloc:·gc.count                         thrpt   10          70.000                 counts
FooBenchmark.no_alloc_but_alloc:·gc.time                          thrpt   10          29.000                     ms
*/