title: Strange output when using JMH
body: <p>I'm using jmh to benchmark a simple application (from SO question <a href="https://stackoverflow.com/questions/31267341/unexpected-scalability-results-in-java-fork-join-java-8?noredirect=1#comment50540211_31267341">Unexpected Scalability results in java fork-join</a>) using maven and following the command-line approach as advised in <a href="http://openjdk.java.net/projects/code-tools/jmh/" rel="nofollow noreferrer">http://openjdk.java.net/projects/code-tools/jmh/</a>. After successfully setting up and building the benchmark, I get the following benchmark results using the avgt mode:</p>
  
  <pre><code>C:\Users\username\my-app\test&gt;java -jar target/benchmarks.jar -bm avgt -f 1
  # JMH 1.10.1 (released 13 days ago)
  # VM invoker: C:\Program Files\Java\jre1.8.0_45\bin\java.exe
  # VM options: &lt;none&gt;
  # Warmup: 20 iterations, 1 s each
  # Measurement: 20 iterations, 1 s each
  # Timeout: 10 min per iteration
  # Threads: 1 thread, will synchronize iterations
  # Benchmark mode: Average time, time/op
  # Benchmark: org.sample.MyBenchmark.testMethod
  
  # Run progress: 0,00% complete, ETA 00:00:40
  # Fork: 1 of 1
  # Warmup Iteration   1: ? 10?? s/op
  # Warmup Iteration   2: ? 10?? s/op
  # Warmup Iteration   3: ? 10?? s/op
  # Warmup Iteration   4: ? 10?? s/op
  # Warmup Iteration   5: ? 10?? s/op
  # Warmup Iteration   6: ? 10?? s/op
  # Warmup Iteration   7: ? 10?? s/op
  # Warmup Iteration   8: ? 10?? s/op
  # Warmup Iteration   9: ? 10?? s/op
  # Warmup Iteration  10: ? 10?? s/op
  # Warmup Iteration  11: ? 10?? s/op
  # Warmup Iteration  12: ? 10?? s/op
  # Warmup Iteration  13: ? 10?? s/op
  # Warmup Iteration  14: ? 10?? s/op
  # Warmup Iteration  15: ? 10?¹? s/op
  # Warmup Iteration  16: ? 10?? s/op
  # Warmup Iteration  17: ? 10?¹? s/op
  # Warmup Iteration  18: ? 10?? s/op
  # Warmup Iteration  19: ? 10?¹? s/op
  # Warmup Iteration  20: ? 10?¹? s/op
  Iteration   1: ? 10?¹? s/op
  Iteration   2: ? 10?¹? s/op
  Iteration   3: ? 10?? s/op
  Iteration   4: ? 10?¹? s/op
  Iteration   5: ? 10?¹? s/op
  Iteration   6: ? 10?? s/op
  Iteration   7: ? 10?¹? s/op
  Iteration   8: ? 10?? s/op
  Iteration   9: ? 10?? s/op
  Iteration  10: ? 10?¹? s/op
  Iteration  11: ? 10?? s/op
  Iteration  12: ? 10?? s/op
  Iteration  13: ? 10?¹? s/op
  Iteration  14: ? 10?? s/op
  Iteration  15: ? 10?? s/op
  Iteration  16: ? 10?¹? s/op
  Iteration  17: ? 10?? s/op
  Iteration  18: ? 10?¹? s/op
  Iteration  19: ? 10?¹? s/op
  Iteration  20: ? 10?¹? s/op
  
  
  Result "testMethod":
  ? 10?¹? s/op
  
  
  # Run complete. Total time: 00:00:40
  
  Benchmark               Mode  Cnt    Score     Error  Units
  MyBenchmark.testMethod  avgt   20  ? 10?¹?             s/op
  </code></pre>
  
  <p>I'm not sure how to interpret this output, but I'm quite sure something went wrong...? Any idea what or how to debug this?</p>