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* http://creativecommons.org/licenses/publicdomain |
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*/ |
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– |
//import jsr166y.*; |
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import java.util.*; |
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import java.util.concurrent.*; |
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num = Integer.parseInt(args[1]); |
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} |
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catch (Exception e) { |
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< |
System.out.println("Usage: java DynamicLeftSpineFib <threads> <number> [<sequentialThreshold>]"); |
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> |
System.out.println("Usage: java DynamicLeftSpineFib <threads> <number> [<sequntialThreshold>]"); |
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return; |
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} |
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|
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for (int reps = 0; reps < 2; ++reps) { |
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< |
ForkJoinPool g = (procs == 0) ? |
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< |
new ForkJoinPool() : |
31 |
> |
ForkJoinPool g = procs == 0? new ForkJoinPool() : |
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new ForkJoinPool(procs); |
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lastStealCount = g.getStealCount(); |
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for (int i = 0; i < 10; ++i) { |
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DynamicLeftSpineFib f = new DynamicLeftSpineFib(num, null); |
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g.invoke(f); |
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long time = System.currentTimeMillis() - start; |
48 |
< |
double secs = (double) time / 1000.0; |
48 |
> |
double secs = ((double)time) / 1000.0; |
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long result = f.getAnswer(); |
50 |
< |
System.out.print("DynamicLeftSpineFib " + num + " = " + result); |
50 |
> |
System.out.print("DLSFib " + num + " = " + result); |
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System.out.printf("\tTime: %7.3f", secs); |
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long sc = g.getStealCount(); |
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long ns = sc - lastStealCount; |
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public final void compute() { |
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int n = number; |
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if (n > 1) { |
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+ |
int r = 0; |
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DynamicLeftSpineFib rt = null; |
78 |
< |
while (n > 1 && getSurplusQueuedTaskCount() <= 3) { |
79 |
< |
(rt = new DynamicLeftSpineFib(n - 2, rt)).fork(); |
78 |
> |
while (getSurplusQueuedTaskCount() <= 3) { |
79 |
> |
int m = n - 2; |
80 |
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n -= 1; |
81 |
+ |
if (m <= 1) { |
82 |
+ |
r += m; |
83 |
+ |
if (n > 1) { |
84 |
+ |
r += n - 2; |
85 |
+ |
n -= 1; |
86 |
+ |
} |
87 |
+ |
break; |
88 |
+ |
} |
89 |
+ |
(rt = new DynamicLeftSpineFib(m, rt)).fork(); |
90 |
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} |
91 |
< |
int r = seqFib(n); |
91 |
> |
r += seqFib(n); |
92 |
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while (rt != null) { |
93 |
< |
if (rt.tryUnfork()) rt.compute(); else rt.helpJoin(); |
93 |
> |
if (rt.tryUnfork()) rt.compute(); else rt.join(); |
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r += rt.number; |
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rt = rt.next; |
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} |
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} |
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109 |
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} |
110 |
+ |
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