[GitHub] amarkevich opened a new pull request #479: String.split via fastpath instead of precompiled Pattern

[GitBox]

amarkevich opened a new pull request #479: String.split via fastpath instead of 
precompiled Pattern
URL: https://github.com/apache/cxf/pull/479
 
 
   
https://stackoverflow.com/questions/29393086/pattern-split-slower-than-string-split
   
   benchmark:
   
   `public class SplitTest {
   
       private static final int CNT = 131072;
       private static String[] STR = new String[CNT];
       private static final String SEPARATOR = " ";
       static {
           for (int i = 0; i < CNT; ++i) {
               STR[i] = i + SEPARATOR + i;
           }
       }
   
       @org.junit.Test
       public void stringSplit() {
           metrics("String.split", s -> s.split(SEPARATOR));
       }
   
       @org.junit.Test
       public void pattern() {
           metrics("Pattern", 
java.util.regex.Pattern.compile(SEPARATOR)::split);
       }
   
       private static void metrics(String label, Function<String, String[]> f) {
           Runtime.getRuntime().gc();
           long m = Runtime.getRuntime().freeMemory();
           long t = System.currentTimeMillis();
           for (int i = 0; i < CNT; ++i) {
               org.junit.Assert.assertSame(2, f.apply(STR[i]).length);
           }
           System.out.println(label + ": "
                   + ((m - Runtime.getRuntime().freeMemory()) / 1000000) + " MB 
"
                   + (System.currentTimeMillis() - t) + " ms");
       }
   
       public static void main(String[] args) {
           SplitTest splitTest = new SplitTest();
           for (int i = 0; i < 10; ++i) {
               splitTest.stringSplit();
               splitTest.pattern();
           }
       }
   }`
   
   results using java version "1.8.0_192":
   `String.split: 33 MB 16 ms
   Pattern: 57 MB 47 ms
   `

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