Changeset be53b87 for benchmark/creation/JavaThread.java
- Timestamp:
- Jul 29, 2019, 1:46:24 PM (5 years ago)
- Branches:
- ADT, arm-eh, ast-experimental, enum, forall-pointer-decay, jacob/cs343-translation, jenkins-sandbox, master, new-ast, new-ast-unique-expr, pthread-emulation, qualifiedEnum
- Children:
- 5453237
- Parents:
- 033ff37
- git-author:
- Peter A. Buhr <pabuhr@…> (07/29/19 12:40:16)
- git-committer:
- Peter A. Buhr <pabuhr@…> (07/29/19 13:46:24)
- File:
-
- 1 edited
Legend:
- Unmodified
- Added
- Removed
-
benchmark/creation/JavaThread.java
r033ff37 rbe53b87 1 1 public class JavaThread { 2 // Simplistic low-quality Marsaglia Shift-XOR pseudo-random number generator. 3 // Bijective 4 // Cycle length for non-zero values is 4G-1. 5 // 0 is absorbing and should be avoided -- fixed point. 6 // The returned value is typically masked to produce a positive value. 7 static volatile int Ticket = 0 ; 8 9 private static int nextRandom (int x) { 10 if (x == 0) { 11 // reseed the PRNG 12 // Ticket is accessed infrequently and does not constitute a coherence hot-spot. 13 // Note that we use a non-atomic racy increment -- the race is rare and benign. 14 // If the race is a concern switch to an AtomicInteger. 15 // In addition accesses to the RW volatile global "Ticket" variable are not 16 // (readily) predictable at compile-time so the JIT will not be able to elide 17 // nextRandom() invocations. 18 x = ++Ticket ; 19 if (x == 0) x = 1 ; 20 } 21 x ^= x << 6; 22 x ^= x >>> 21; 23 x ^= x << 7; 24 return x ; 25 } 26 static int x = 2; 27 28 static private final int NoOfTimes = Integer.parseInt("10000") ; 29 2 30 public static class MyThread extends Thread { 3 31 @Override 4 32 public void run() {} 5 33 } 6 7 public static void main(String[] args) throws InterruptedException { 8 int NoOfTimes = 50000; 9 long start = System.nanoTime(); 34 public static void helper() throws InterruptedException { 10 35 for(int i = 1; i <= NoOfTimes; i += 1) { 11 JavaThread.MyThread m = new JavaThread.MyThread(); 12 m.start(); 36 MyThread m = new MyThread(); 37 x = nextRandom( x ); 38 m.start(); 13 39 m.join(); 14 40 } 41 } 42 public static void InnerMain() throws InterruptedException { 43 long start = System.nanoTime(); 44 helper(); 15 45 long end = System.nanoTime(); 16 System.out.println( (end - start) / NoOfTimes); 46 System.out.println( (end - start) / NoOfTimes ); 47 } 48 public static void main(String[] args) throws InterruptedException { 49 for (int n = Integer.parseInt("5"); --n >= 0 ; ) { 50 InnerMain(); 51 Thread.sleep(2000); // 2 seconds 52 x = nextRandom(x); 53 } 54 if ( x == 0 ) System.out.println(x); 17 55 } 18 56 }
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