XenoAmess edited a comment on pull request #534:
URL: https://github.com/apache/commons-lang/pull/534#issuecomment-637236609
solution:
after doing the splition, it can speed up around 25%.
```
[INFO] --- exec-maven-plugin:1.6.0:exec (benchmark) @ commons-lang3 ---
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.openjdk.jmh.util.Utils
(file:/C:/Users/xenoa/.m2/repository/org/openjdk
/jmh/jmh-core/1.21/jmh-core-1.21.jar) to field java.io.PrintStream.charOut
WARNING: Please consider reporting this to the maintainers of
org.openjdk.jmh.util.Utils
WARNING: Use --illegal-access=warn to enable warnings of further illegal
reflective access operations
WARNING: All illegal access operations will be denied in a future release
# JMH version: 1.21
# VM version: JDK 13.0.2, OpenJDK 64-Bit Server VM, 13.0.2+8
# VM invoker: C:\jdk-13.0.2+8\bin\java.exe
# VM options: <none>
# Warmup: 5 iterations, 10 s each
# Measurement: 5 iterations, 10 s each
# Timeout: 10 min per iteration
# Threads: 1 thread, will synchronize iterations
# Benchmark mode: Average time, time/op
# Benchmark:
org.apache.commons.lang3.CharSequenceUtilsRegionMatchesTest.testNew
# Run progress: 0.00% complete, ETA 00:50:00
# Fork: 1 of 5
# Warmup Iteration 1: 1676780966.667 ns/op
# Warmup Iteration 2: 1771491016.667 ns/op
# Warmup Iteration 3: 1581506185.714 ns/op
# Warmup Iteration 4: 2056147750.000 ns/op
# Warmup Iteration 5: 1432607457.143 ns/op
Iteration 1: 1810178866.667 ns/op
Iteration 2: 1446362657.143 ns/op
Iteration 3: 1748144866.667 ns/op
Iteration 4: 1605476071.429 ns/op
Iteration 5: 1794209950.000 ns/op
# Run progress: 3.33% complete, ETA 00:52:22
# Fork: 2 of 5
# Warmup Iteration 1: 1511623771.429 ns/op
# Warmup Iteration 2: 1495295371.429 ns/op
# Warmup Iteration 3: 1495742928.571 ns/op
# Warmup Iteration 4: 1722803700.000 ns/op
# Warmup Iteration 5: 1482953414.286 ns/op
Iteration 1: 1745675116.667 ns/op
Iteration 2: 1611334828.571 ns/op
Iteration 3: 1673340485.714 ns/op
Iteration 4: 1357552837.500 ns/op
Iteration 5: 1564756800.000 ns/op
# Run progress: 6.67% complete, ETA 00:50:36
# Fork: 3 of 5
# Warmup Iteration 1: 1717714433.333 ns/op
# Warmup Iteration 2: 1775668516.667 ns/op
# Warmup Iteration 3: 1762111866.667 ns/op
# Warmup Iteration 4: 2135332980.000 ns/op
# Warmup Iteration 5: 1715229116.667 ns/op
Iteration 1: 1966963233.333 ns/op
Iteration 2: 2031982040.000 ns/op
Iteration 3: 1813285066.667 ns/op
Iteration 4: 1934091583.333 ns/op
Iteration 5: 1990891316.667 ns/op
# Run progress: 10.00% complete, ETA 00:49:03
# Fork: 4 of 5
# Warmup Iteration 1: 1637729900.000 ns/op
# Warmup Iteration 2: 2080932760.000 ns/op
# Warmup Iteration 3: 1770361200.000 ns/op
# Warmup Iteration 4: 1370627400.000 ns/op
# Warmup Iteration 5: 1629913900.000 ns/op
Iteration 1: 2002821900.000 ns/op
Iteration 2: 1841407766.667 ns/op
Iteration 3: 1609561685.714 ns/op
Iteration 4: 1557553557.143 ns/op
Iteration 5: 1677166966.667 ns/op
# Run progress: 13.33% complete, ETA 00:47:13
# Fork: 5 of 5
# Warmup Iteration 1: 1319836937.500 ns/op
# Warmup Iteration 2: 1540287771.429 ns/op
# Warmup Iteration 3: 1593160257.143 ns/op
# Warmup Iteration 4: 1546483685.714 ns/op
# Warmup Iteration 5: 1543815542.857 ns/op
Iteration 1: 1682335566.667 ns/op
Iteration 2: 1566039728.571 ns/op
Iteration 3: 1694355566.667 ns/op
Iteration 4: 1599394871.429 ns/op
Iteration 5: 1757485850.000 ns/op
Result "org.apache.commons.lang3.CharSequenceUtilsRegionMatchesTest.testNew":
1723294767.195 ?99.9%) 131123557.188 ns/op [Average]
(min, avg, max) = (1357552837.500, 1723294767.195, 2031982040.000), stdev
= 175046197.369
CI (99.9%): [1592171210.007, 1854418324.383] (assumes normal distribution)
# JMH version: 1.21
# VM version: JDK 13.0.2, OpenJDK 64-Bit Server VM, 13.0.2+8
# VM invoker: C:\jdk-13.0.2+8\bin\java.exe
# VM options: <none>
# Warmup: 5 iterations, 10 s each
# Measurement: 5 iterations, 10 s each
# Timeout: 10 min per iteration
# Threads: 1 thread, will synchronize iterations
# Benchmark mode: Average time, time/op
# Benchmark:
org.apache.commons.lang3.CharSequenceUtilsRegionMatchesTest.testOld
# Run progress: 16.67% complete, ETA 00:45:19
# Fork: 1 of 5
# Warmup Iteration 1: 1830971983.333 ns/op
# Warmup Iteration 2: 2188674760.000 ns/op
# Warmup Iteration 3: 2181211500.000 ns/op
# Warmup Iteration 4: 2349953100.000 ns/op
# Warmup Iteration 5: 2360081080.000 ns/op
Iteration 1: 2212511940.000 ns/op
Iteration 2: 2384214220.000 ns/op
Iteration 3: 2227561540.000 ns/op
Iteration 4: 2312551740.000 ns/op
Iteration 5: 2426368360.000 ns/op
# Run progress: 20.00% complete, ETA 00:43:56
# Fork: 2 of 5
# Warmup Iteration 1: 2717844250.000 ns/op
# Warmup Iteration 2: 2585462975.000 ns/op
# Warmup Iteration 3: 2473264440.000 ns/op
# Warmup Iteration 4: 2270443600.000 ns/op
# Warmup Iteration 5: 1808085450.000 ns/op
Iteration 1: 2028658920.000 ns/op
Iteration 2: 2032796820.000 ns/op
Iteration 3: 2038743100.000 ns/op
Iteration 4: 2217756360.000 ns/op
Iteration 5: 2352394580.000 ns/op
# Run progress: 23.33% complete, ETA 00:42:08
# Fork: 3 of 5
# Warmup Iteration 1: 2084758120.000 ns/op
# Warmup Iteration 2: 1932792450.000 ns/op
# Warmup Iteration 3: 2002423360.000 ns/op
# Warmup Iteration 4: 2377394140.000 ns/op
# Warmup Iteration 5: 2107299380.000 ns/op
Iteration 1: 2456784940.000 ns/op
Iteration 2: 2353495040.000 ns/op
Iteration 3: 2355378120.000 ns/op
Iteration 4: 2271070960.000 ns/op
Iteration 5: 1892835216.667 ns/op
# Run progress: 26.67% complete, ETA 00:40:29
# Fork: 4 of 5
# Warmup Iteration 1: 1807640716.667 ns/op
# Warmup Iteration 2: 2016794460.000 ns/op
# Warmup Iteration 3: 2198285300.000 ns/op
# Warmup Iteration 4: 2100802840.000 ns/op
# Warmup Iteration 5: 2311592060.000 ns/op
Iteration 1: 2380056300.000 ns/op
Iteration 2: 2138964640.000 ns/op
Iteration 3: 2291114240.000 ns/op
Iteration 4: 2349544800.000 ns/op
Iteration 5: 2390796680.000 ns/op
# Run progress: 30.00% complete, ETA 00:38:44
# Fork: 5 of 5
# Warmup Iteration 1: 2325848660.000 ns/op
# Warmup Iteration 2: 2471929880.000 ns/op
# Warmup Iteration 3: 2182010260.000 ns/op
# Warmup Iteration 4: 1941523050.000 ns/op
# Warmup Iteration 5: 2275766680.000 ns/op
Iteration 1: 2225102700.000 ns/op
Iteration 2: 2390513420.000 ns/op
Iteration 3: 2354390080.000 ns/op
Iteration 4: 2202851920.000 ns/op
Iteration 5: 2233467340.000 ns/op
Result "org.apache.commons.lang3.CharSequenceUtilsRegionMatchesTest.testOld":
2260796959.067 ?99.9%) 107182112.664 ns/op [Average]
(min, avg, max) = (1892835216.667, 2260796959.067, 2456784940.000), stdev
= 143085053.900
CI (99.9%): [2153614846.403, 2367979071.730] (assumes normal distribution)
# JMH version: 1.21
# VM version: JDK 13.0.2, OpenJDK 64-Bit Server VM, 13.0.2+8
# VM invoker: C:\jdk-13.0.2+8\bin\java.exe
```
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