Код:
# JMH 1.11.2 (released 92 days ago, please consider updating!)
# VM version: JDK 1.8.0_60, VM 25.60-b23
# VM invoker: /Library/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home/jre/bin/java
# VM options: -Xms2g -Xmx2g -Didea.launcher.port=7532 -Didea.launcher.bin.path=/Applications/IntelliJ IDEA 15.app/Contents/bin -Dfile.encoding=UTF-8
# Warmup: 10 iterations, 1 s each
# Measurement: 10 iterations, 1 s each
# Timeout: 10 min per iteration
# Threads: 1 thread, will synchronize iterations
# Benchmark mode: Average time, time/op
# Benchmark: org.postgresql.util.StringConcat.buffer
# Run progress: 0,00% complete, ETA 00:02:00
# Fork: 1 of 3
# Warmup Iteration 1: 504,478 ms/op
# Warmup Iteration 2: 167,282 ms/op
# Warmup Iteration 3: 156,712 ms/op
# Warmup Iteration 4: 142,019 ms/op
# Warmup Iteration 5: 130,716 ms/op
# Warmup Iteration 6: 132,175 ms/op
# Warmup Iteration 7: 130,494 ms/op
# Warmup Iteration 8: 128,751 ms/op
# Warmup Iteration 9: 128,376 ms/op
# Warmup Iteration 10: 135,927 ms/op
Iteration 1: 142,503 ms/op
Iteration 2: 126,427 ms/op
Iteration 3: 121,183 ms/op
Iteration 4: 123,705 ms/op
Iteration 5: 134,235 ms/op
Iteration 6: 122,471 ms/op
Iteration 7: 124,813 ms/op
Iteration 8: 127,109 ms/op
Iteration 9: 122,452 ms/op
Iteration 10: 128,862 ms/op
# Run progress: 16,67% complete, ETA 00:01:50
# Fork: 2 of 3
# Warmup Iteration 1: 290,340 ms/op
# Warmup Iteration 2: 133,337 ms/op
# Warmup Iteration 3: 123,226 ms/op
# Warmup Iteration 4: 131,857 ms/op
# Warmup Iteration 5: 128,725 ms/op
# Warmup Iteration 6: 129,772 ms/op
# Warmup Iteration 7: 123,170 ms/op
# Warmup Iteration 8: 122,863 ms/op
# Warmup Iteration 9: 129,920 ms/op
# Warmup Iteration 10: 120,862 ms/op
Iteration 1: 122,446 ms/op
Iteration 2: 124,428 ms/op
Iteration 3: 133,191 ms/op
Iteration 4: 119,475 ms/op
Iteration 5: 126,896 ms/op
Iteration 6: 123,963 ms/op
Iteration 7: 134,483 ms/op
Iteration 8: 133,446 ms/op
Iteration 9: 127,896 ms/op
Iteration 10: 125,156 ms/op
# Run progress: 33,33% complete, ETA 00:01:28
# Fork: 3 of 3
# Warmup Iteration 1: 285,805 ms/op
# Warmup Iteration 2: 130,223 ms/op
# Warmup Iteration 3: 122,691 ms/op
# Warmup Iteration 4: 132,281 ms/op
# Warmup Iteration 5: 130,149 ms/op
# Warmup Iteration 6: 129,617 ms/op
# Warmup Iteration 7: 125,146 ms/op
# Warmup Iteration 8: 125,089 ms/op
# Warmup Iteration 9: 133,226 ms/op
# Warmup Iteration 10: 125,234 ms/op
Iteration 1: 119,962 ms/op
Iteration 2: 126,932 ms/op
Iteration 3: 132,335 ms/op
Iteration 4: 131,525 ms/op
Iteration 5: 127,541 ms/op
Iteration 6: 121,408 ms/op
Iteration 7: 119,892 ms/op
Iteration 8: 139,716 ms/op
Iteration 9: 121,877 ms/op
Iteration 10: 125,758 ms/op
Result "buffer":
127,070 ±(99.9%) 3,904 ms/op [Average]
(min, avg, max) = (119,475, 127,070, 142,503), stdev = 5,844
CI (99.9%): [123,165, 130,974] (assumes normal distribution)
# JMH 1.11.2 (released 92 days ago, please consider updating!)
# VM version: JDK 1.8.0_60, VM 25.60-b23
# VM invoker: /Library/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home/jre/bin/java
# VM options: -Xms2g -Xmx2g -Didea.launcher.port=7532 -Didea.launcher.bin.path=/Applications/IntelliJ IDEA 15.app/Contents/bin -Dfile.encoding=UTF-8
# Warmup: 10 iterations, 1 s each
# Measurement: 10 iterations, 1 s each
# Timeout: 10 min per iteration
# Threads: 1 thread, will synchronize iterations
# Benchmark mode: Average time, time/op
# Benchmark: org.postgresql.util.StringConcat.builder
# Run progress: 50,00% complete, ETA 00:01:06
# Fork: 1 of 3
# Warmup Iteration 1: 177,462 ms/op
# Warmup Iteration 2: 127,427 ms/op
# Warmup Iteration 3: 116,823 ms/op
# Warmup Iteration 4: 128,042 ms/op
# Warmup Iteration 5: 126,923 ms/op
# Warmup Iteration 6: 123,174 ms/op
# Warmup Iteration 7: 125,599 ms/op
# Warmup Iteration 8: 127,271 ms/op
# Warmup Iteration 9: 128,333 ms/op
# Warmup Iteration 10: 114,842 ms/op
Iteration 1: 128,124 ms/op
Iteration 2: 117,573 ms/op
Iteration 3: 126,854 ms/op
Iteration 4: 127,813 ms/op
Iteration 5: 116,706 ms/op
Iteration 6: 120,092 ms/op
Iteration 7: 122,443 ms/op
Iteration 8: 124,191 ms/op
Iteration 9: 125,831 ms/op
Iteration 10: 121,483 ms/op
# Run progress: 66,67% complete, ETA 00:00:44
# Fork: 2 of 3
# Warmup Iteration 1: 175,898 ms/op
# Warmup Iteration 2: 129,208 ms/op
# Warmup Iteration 3: 125,624 ms/op
# Warmup Iteration 4: 117,651 ms/op
# Warmup Iteration 5: 129,693 ms/op
# Warmup Iteration 6: 122,625 ms/op
# Warmup Iteration 7: 117,697 ms/op
# Warmup Iteration 8: 118,748 ms/op
# Warmup Iteration 9: 129,949 ms/op
# Warmup Iteration 10: 129,812 ms/op
Iteration 1: 122,881 ms/op
Iteration 2: 120,961 ms/op
Iteration 3: 116,294 ms/op
Iteration 4: 129,627 ms/op
Iteration 5: 122,964 ms/op
Iteration 6: 117,850 ms/op
Iteration 7: 124,518 ms/op
Iteration 8: 169,902 ms/op
Iteration 9: 124,100 ms/op
Iteration 10: 124,082 ms/op
# Run progress: 83,33% complete, ETA 00:00:22
# Fork: 3 of 3
# Warmup Iteration 1: 178,994 ms/op
# Warmup Iteration 2: 129,012 ms/op
# Warmup Iteration 3: 133,074 ms/op
# Warmup Iteration 4: 123,572 ms/op
# Warmup Iteration 5: 137,259 ms/op
# Warmup Iteration 6: 125,592 ms/op
# Warmup Iteration 7: 125,917 ms/op
# Warmup Iteration 8: 125,565 ms/op
# Warmup Iteration 9: 134,758 ms/op
# Warmup Iteration 10: 123,280 ms/op
Iteration 1: 121,962 ms/op
Iteration 2: 121,457 ms/op
Iteration 3: 129,659 ms/op
Iteration 4: 136,555 ms/op
Iteration 5: 130,896 ms/op
Iteration 6: 136,405 ms/op
Iteration 7: 128,355 ms/op
Iteration 8: 138,604 ms/op
Iteration 9: 130,620 ms/op
Iteration 10: 126,581 ms/op
Result "builder":
126,846 ±(99.9%) 6,624 ms/op [Average]
(min, avg, max) = (116,294, 126,846, 169,902), stdev = 9,915
CI (99.9%): [120,222, 133,470] (assumes normal distribution)