Java collection iteration benchmark results (JMH)

java_jmh.log

18:15:58: Executing task 'jmh'...

:compileJava NO-SOURCE
:compileGroovy NO-SOURCE
:processResources NO-SOURCE
:classes UP-TO-DATE
:compileTestJava NO-SOURCE
:compileTestGroovy NO-SOURCE
:processTestResources NO-SOURCE
:testClasses UP-TO-DATE
:compileJmhJava
:compileJmhGroovy
:processJmhResources NO-SOURCE
:jmhClasses
:jmhRunBytecodeGenerator
Processing 1 classes from /home/wololock/workspace/groovy-jmh/build/classes/java/jmh with "reflection" generator
Processing 4 classes from /home/wololock/workspace/groovy-jmh/build/classes/groovy/jmh with "reflection" generator
Writing out Java source to /home/wololock/workspace/groovy-jmh/build/jmh-generated-sources and resources to /home/wololock/workspace/groovy-jmh/build/jmh-generated-resources
:jmhCompileGeneratedClasses
:jmhJar
:jmh
# JMH version: 1.21
# VM version: JDK 1.8.0_162, Java HotSpot(TM) 64-Bit Server VM, 25.162-b12
# VM invoker: /usr/java/jdk1.8.0_162/jre/bin/java
# VM options: <none>
# Warmup: 1 iterations, 60 s each
# Measurement: 120 iterations, 1 s each
# Timeout: 10 min per iteration
# Threads: 1 thread, will synchronize iterations
# Benchmark mode: Average time, time/op
# Benchmark: bench.JavaBench.javaForEach

# Run progress: 75,00% complete, ETA 00:06:23
# Fork: 1 of 1
# Warmup Iteration   1: 8,852 ms/op
Iteration   1: 8,988 ms/op
Iteration   2: 8,816 ms/op
Iteration   3: 8,794 ms/op
Iteration   4: 8,828 ms/op
Iteration   5: 8,800 ms/op
Iteration   6: 8,850 ms/op
Iteration   7: 8,859 ms/op
Iteration   8: 8,843 ms/op
Iteration   9: 8,913 ms/op
Iteration  10: 8,803 ms/op
Iteration  11: 8,857 ms/op
Iteration  12: 8,858 ms/op
Iteration  13: 8,873 ms/op
Iteration  14: 8,849 ms/op
Iteration  15: 8,806 ms/op
Iteration  16: 8,823 ms/op
Iteration  17: 8,793 ms/op
Iteration  18: 8,821 ms/op
Iteration  19: 8,816 ms/op
Iteration  20: 8,843 ms/op
Iteration  21: 8,858 ms/op
Iteration  22: 8,856 ms/op
Iteration  23: 8,789 ms/op
Iteration  24: 8,823 ms/op
Iteration  25: 8,786 ms/op
Iteration  26: 8,847 ms/op
Iteration  27: 8,857 ms/op
Iteration  28: 8,864 ms/op
Iteration  29: 8,891 ms/op
Iteration  30: 8,862 ms/op
Iteration  31: 8,838 ms/op
Iteration  32: 8,834 ms/op
Iteration  33: 8,835 ms/op
Iteration  34: 8,794 ms/op
Iteration  35: 8,868 ms/op
Iteration  36: 8,806 ms/op
Iteration  37: 8,845 ms/op
Iteration  38: 8,787 ms/op
Iteration  39: 8,788 ms/op
Iteration  40: 8,788 ms/op
Iteration  41: 8,868 ms/op
Iteration  42: 8,822 ms/op
Iteration  43: 8,871 ms/op
Iteration  44: 8,816 ms/op
Iteration  45: 8,810 ms/op
Iteration  46: 8,859 ms/op
Iteration  47: 8,876 ms/op
Iteration  48: 8,880 ms/op
Iteration  49: 8,874 ms/op
Iteration  50: 8,865 ms/op
Iteration  51: 8,847 ms/op
Iteration  52: 8,881 ms/op
Iteration  53: 8,867 ms/op
Iteration  54: 8,868 ms/op
Iteration  55: 8,841 ms/op
Iteration  56: 8,906 ms/op
Iteration  57: 8,844 ms/op
Iteration  58: 8,833 ms/op
Iteration  59: 8,827 ms/op
Iteration  60: 8,830 ms/op
Iteration  61: 8,835 ms/op
Iteration  62: 8,852 ms/op
Iteration  63: 8,755 ms/op
Iteration  64: 8,911 ms/op
Iteration  65: 8,828 ms/op
Iteration  66: 8,866 ms/op
Iteration  67: 8,825 ms/op
Iteration  68: 8,840 ms/op
Iteration  69: 8,788 ms/op
Iteration  70: 8,864 ms/op
Iteration  71: 8,856 ms/op
Iteration  72: 8,850 ms/op
Iteration  73: 8,878 ms/op
Iteration  74: 8,839 ms/op
Iteration  75: 8,823 ms/op
Iteration  76: 8,833 ms/op
Iteration  77: 8,952 ms/op
Iteration  78: 8,831 ms/op
Iteration  79: 8,932 ms/op
Iteration  80: 8,845 ms/op
Iteration  81: 8,798 ms/op
Iteration  82: 8,841 ms/op
Iteration  83: 8,807 ms/op
Iteration  84: 8,826 ms/op
Iteration  85: 8,827 ms/op
Iteration  86: 8,837 ms/op
Iteration  87: 8,831 ms/op
Iteration  88: 8,882 ms/op
Iteration  89: 8,826 ms/op
Iteration  90: 8,816 ms/op
Iteration  91: 8,805 ms/op
Iteration  92: 8,800 ms/op
Iteration  93: 8,830 ms/op
Iteration  94: 8,815 ms/op
Iteration  95: 8,865 ms/op
Iteration  96: 8,817 ms/op
Iteration  97: 8,861 ms/op
Iteration  98: 8,798 ms/op
Iteration  99: 8,817 ms/op
Iteration 100: 8,875 ms/op
Iteration 101: 8,862 ms/op
Iteration 102: 8,788 ms/op
Iteration 103: 8,852 ms/op
Iteration 104: 8,865 ms/op
Iteration 105: 8,861 ms/op
Iteration 106: 8,835 ms/op
Iteration 107: 8,854 ms/op
Iteration 108: 8,838 ms/op
Iteration 109: 8,849 ms/op
Iteration 110: 8,803 ms/op
Iteration 111: 8,827 ms/op
Iteration 112: 8,801 ms/op
Iteration 113: 8,829 ms/op
Iteration 114: 8,778 ms/op
Iteration 115: 8,808 ms/op
Iteration 116: 8,776 ms/op
Iteration 117: 8,836 ms/op
Iteration 118: 8,802 ms/op
Iteration 119: 8,849 ms/op
Iteration 120: 8,812 ms/op


Result "bench.JavaBench.javaForEach":
  8,839 ±(99.9%) 0,011 ms/op [Average]
  (min, avg, max) = (8,755, 8,839, 8,988), stdev = 0,036
  CI (99.9%): [8,828, 8,850] (assumes normal distribution)


# JMH version: 1.21
# VM version: JDK 1.8.0_162, Java HotSpot(TM) 64-Bit Server VM, 25.162-b12
# VM invoker: /usr/java/jdk1.8.0_162/jre/bin/java
# VM options: <none>
# Warmup: 1 iterations, 60 s each
# Measurement: 120 iterations, 1 s each
# Timeout: 10 min per iteration
# Threads: 1 thread, will synchronize iterations
# Benchmark mode: Average time, time/op
# Benchmark: bench.JavaBench.javaIteratorTest

# Run progress: 87,50% complete, ETA 00:03:10
# Fork: 1 of 1
# Warmup Iteration   1: 8,854 ms/op
Iteration   1: 8,854 ms/op
Iteration   2: 8,897 ms/op
Iteration   3: 8,828 ms/op
Iteration   4: 8,873 ms/op
Iteration   5: 8,824 ms/op
Iteration   6: 8,911 ms/op
Iteration   7: 8,882 ms/op
Iteration   8: 8,864 ms/op
Iteration   9: 8,848 ms/op
Iteration  10: 9,030 ms/op
Iteration  11: 8,869 ms/op
Iteration  12: 8,888 ms/op
Iteration  13: 8,869 ms/op
Iteration  14: 8,858 ms/op
Iteration  15: 8,923 ms/op
Iteration  16: 8,829 ms/op
Iteration  17: 8,888 ms/op
Iteration  18: 8,841 ms/op
Iteration  19: 8,861 ms/op
Iteration  20: 8,859 ms/op
Iteration  21: 8,866 ms/op
Iteration  22: 8,809 ms/op
Iteration  23: 8,852 ms/op
Iteration  24: 8,853 ms/op
Iteration  25: 8,880 ms/op
Iteration  26: 8,831 ms/op
Iteration  27: 8,915 ms/op
Iteration  28: 8,830 ms/op
Iteration  29: 8,877 ms/op
Iteration  30: 8,929 ms/op
Iteration  31: 8,885 ms/op
Iteration  32: 8,844 ms/op
Iteration  33: 8,853 ms/op
Iteration  34: 8,851 ms/op
Iteration  35: 8,890 ms/op
Iteration  36: 8,835 ms/op
Iteration  37: 8,871 ms/op
Iteration  38: 8,918 ms/op
Iteration  39: 8,809 ms/op
Iteration  40: 8,878 ms/op
Iteration  41: 8,855 ms/op
Iteration  42: 8,883 ms/op
Iteration  43: 8,807 ms/op
Iteration  44: 8,880 ms/op
Iteration  45: 8,848 ms/op
Iteration  46: 8,846 ms/op
Iteration  47: 8,853 ms/op
Iteration  48: 8,863 ms/op
Iteration  49: 8,868 ms/op
Iteration  50: 8,913 ms/op
Iteration  51: 8,827 ms/op
Iteration  52: 8,883 ms/op
Iteration  53: 8,856 ms/op
Iteration  54: 8,834 ms/op
Iteration  55: 8,882 ms/op
Iteration  56: 8,888 ms/op
Iteration  57: 8,861 ms/op
Iteration  58: 8,883 ms/op
Iteration  59: 8,851 ms/op
Iteration  60: 8,820 ms/op
Iteration  61: 8,873 ms/op
Iteration  62: 8,800 ms/op
Iteration  63: 8,822 ms/op
Iteration  64: 8,816 ms/op
Iteration  65: 8,900 ms/op
Iteration  66: 8,846 ms/op
Iteration  67: 8,866 ms/op
Iteration  68: 8,897 ms/op
Iteration  69: 8,805 ms/op
Iteration  70: 8,809 ms/op
Iteration  71: 8,867 ms/op
Iteration  72: 8,868 ms/op
Iteration  73: 8,880 ms/op
Iteration  74: 8,845 ms/op
Iteration  75: 8,839 ms/op
Iteration  76: 8,837 ms/op
Iteration  77: 8,868 ms/op
Iteration  78: 8,819 ms/op
Iteration  79: 8,939 ms/op
Iteration  80: 8,853 ms/op
Iteration  81: 8,861 ms/op
Iteration  82: 8,935 ms/op
Iteration  83: 8,860 ms/op
Iteration  84: 8,875 ms/op
Iteration  85: 8,913 ms/op
Iteration  86: 8,880 ms/op
Iteration  87: 8,936 ms/op
Iteration  88: 8,867 ms/op
Iteration  89: 8,858 ms/op
Iteration  90: 8,866 ms/op
Iteration  91: 8,912 ms/op
Iteration  92: 8,821 ms/op
Iteration  93: 8,879 ms/op
Iteration  94: 8,859 ms/op
Iteration  95: 8,904 ms/op
Iteration  96: 8,852 ms/op
Iteration  97: 8,856 ms/op
Iteration  98: 8,851 ms/op
Iteration  99: 8,916 ms/op
Iteration 100: 8,841 ms/op
Iteration 101: 8,874 ms/op
Iteration 102: 8,802 ms/op
Iteration 103: 8,864 ms/op
Iteration 104: 8,811 ms/op
Iteration 105: 8,883 ms/op
Iteration 106: 8,824 ms/op
Iteration 107: 8,880 ms/op
Iteration 108: 8,853 ms/op
Iteration 109: 8,869 ms/op
Iteration 110: 8,852 ms/op
Iteration 111: 8,865 ms/op
Iteration 112: 8,872 ms/op
Iteration 113: 8,867 ms/op
Iteration 114: 8,821 ms/op
Iteration 115: 8,851 ms/op
Iteration 116: 8,833 ms/op
Iteration 117: 8,828 ms/op
Iteration 118: 8,873 ms/op
Iteration 119: 8,970 ms/op
Iteration 120: 8,890 ms/op


Result "bench.JavaBench.javaIteratorTest":
  8,865 ±(99.9%) 0,011 ms/op [Average]
  (min, avg, max) = (8,800, 8,865, 9,030), stdev = 0,036
  CI (99.9%): [8,854, 8,876] (assumes normal distribution)


# Run complete. Total time: 00:07:34

REMEMBER: The numbers below are just data. To gain reusable insights, you need to follow up on
why the numbers are the way they are. Use profilers (see -prof, -lprof), design factorial
experiments, perform baseline and negative tests that provide experimental control, make sure
the benchmarking environment is safe on JVM/OS/HW level, ask for reviews from the domain experts.
Do not assume the numbers tell you what you want them to tell.

Benchmark                                       Mode  Cnt    Score   Error  Units
JavaBench.javaForEach                           avgt  120    8,839 ± 0,011  ms/op
JavaBench.javaIteratorTest                      avgt  120    8,865 ± 0,011  ms/op

Benchmark result is saved to /home/wololock/workspace/groovy-jmh/build/reports/jmh/results.txt

BUILD SUCCESSFUL in 25m 18s
6 actionable tasks: 6 executed
18:41:17: Task execution finished 'jmh'.

Would be great if you update your blog post to help dispel the persistent myth that groovy is slower than Java. your post comes up as #1 depending on what you search but in this search you are first (at least on mine). https://www.google.com/search?q=java+vs+groovy+iterator+performance