Changeset 2a658e9 for benchmark/ctxswitch/JavaThread.java
- Timestamp:
- Sep 23, 2020, 12:56:32 PM (4 years ago)
- Branches:
- ADT, arm-eh, ast-experimental, enum, forall-pointer-decay, jacob/cs343-translation, master, new-ast-unique-expr, pthread-emulation, qualifiedEnum
- Children:
- 4ab3cf9b
- Parents:
- 305cd5c
- File:
-
- 1 edited
Legend:
- Unmodified
- Added
- Removed
-
benchmark/ctxswitch/JavaThread.java
r305cd5c r2a658e9 1 1 public class JavaThread { 2 2 // Simplistic low-quality Marsaglia Shift-XOR pseudo-random number generator. 3 // Bijective 3 // Bijective 4 4 // Cycle length for non-zero values is 4G-1. 5 5 // 0 is absorbing and should be avoided -- fixed point. 6 6 // The returned value is typically masked to produce a positive value. 7 static volatile int Ticket = 0 ; 7 static volatile int Ticket = 0 ; 8 8 9 9 private static int nextRandom (int x) { 10 if (x == 0) { 10 if (x == 0) { 11 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 ; 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 20 } 21 21 x ^= x << 6; 22 22 x ^= x >>> 21; 23 23 x ^= x << 7; 24 return x ; 24 return x ; 25 25 } 26 26 static int x = 2; 27 27 28 static private int times = Integer.parseInt("100000");28 static private long times = Long.parseLong("100000"); 29 29 30 30 public static void helper() { 31 for( inti = 1; i <= times; i += 1) {31 for(long i = 1; i <= times; i += 1) { 32 32 Thread.yield(); 33 33 } … … 41 41 public static void main(String[] args) throws InterruptedException { 42 42 if ( args.length > 2 ) System.exit( 1 ); 43 if ( args.length == 2 ) { times = Integer.parseInt(args[1]); }43 if ( args.length == 2 ) { times = Long.parseLong(args[1]); } 44 44 45 45 for (int i = Integer.parseInt("5"); --i >= 0 ; ) {
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