Hi,
I want to simulate the Java 'synchronized' methods in X10, so what I
did is to add a lock to the object. As shown in the attached source code
below, the 'syncIncr()' method is expected to yield a good performance.
The problem is that I am not getting a good result here:
Profile result:
t(b) =38273 // 38 us
t(s) =693384 // 693 us
Any suggestions to improve the program?
Source code:
1 public class TestLock {
2 public static class Counter {
3 private var c:int;
4 private val lock:Lock;
5 public def this() {
6 c = 0;
7 lock = new Lock();
8 }
9
10 public def incr() {
11 this.c = this.c + 1;
12 }
13
14 public def syncIncr() {
15 lock.lock();
16 this.c = this.c + 1;
17 lock.unlock();
18 }
19 }
20
21 public static def main(Array[String](1)) {
22 val o = new Counter();
23
24 var t:Long = -System.nanoTime();
25 for (var i:int=0; i < 10000; i++) {
26 o.incr();
27 }
28
29 t += System.nanoTime();
30 Console.ERR.println(" t(b) =" + t);
31
32 var t1:Long = -System.nanoTime();
33 for (var i:int=0; i < 10000; i++) {
34 o.syncIncr();
35 }
36 t1 += System.nanoTime();
37 Console.ERR.println(" t(s) =" + t1);
38 }
39 }
Regards,
- Qiming
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