1 |
|
/* |
2 |
|
* Written by Doug Lea with assistance from members of JCP JSR-166 |
3 |
|
* Expert Group and released to the public domain, as explained at |
4 |
< |
* http://creativecommons.org/licenses/publicdomain |
4 |
> |
* http://creativecommons.org/publicdomain/zero/1.0/ |
5 |
|
*/ |
6 |
|
|
7 |
< |
import java.util.*; |
8 |
< |
import java.util.concurrent.*; |
9 |
< |
import java.util.concurrent.atomic.*; |
10 |
< |
import java.util.concurrent.locks.*; |
7 |
> |
import java.util.ArrayList; |
8 |
> |
import java.util.Deque; |
9 |
> |
import java.util.concurrent.Callable; |
10 |
> |
import java.util.concurrent.CyclicBarrier; |
11 |
> |
import java.util.concurrent.ExecutorService; |
12 |
> |
import java.util.concurrent.Executors; |
13 |
> |
import java.util.concurrent.Future; |
14 |
> |
import java.util.concurrent.atomic.AtomicInteger; |
15 |
|
|
16 |
|
public class ConcurrentDequeLoops { |
17 |
|
static final ExecutorService pool = Executors.newCachedThreadPool(); |
22 |
|
int maxStages = 8; |
23 |
|
int items = 1000000; |
24 |
|
|
25 |
< |
Class klass = null; |
25 |
> |
Class<?> klass = null; |
26 |
|
if (args.length > 0) { |
27 |
|
try { |
28 |
|
klass = Class.forName(args[0]); |
29 |
< |
} catch(ClassNotFoundException e) { |
29 |
> |
} catch (ClassNotFoundException e) { |
30 |
|
throw new RuntimeException("Class " + args[0] + " not found."); |
31 |
|
} |
32 |
|
} |
33 |
< |
else |
33 |
> |
else |
34 |
|
throw new Error(); |
35 |
|
|
36 |
< |
if (args.length > 1) |
36 |
> |
if (args.length > 1) |
37 |
|
maxStages = Integer.parseInt(args[1]); |
38 |
|
|
39 |
|
System.out.print("Class: " + klass.getName()); |
47 |
|
Thread.sleep(100); |
48 |
|
print = true; |
49 |
|
|
50 |
< |
int k = 1; |
47 |
< |
for (int i = 1; i <= maxStages;) { |
50 |
> |
for (int k = 1, i = 1; i <= maxStages;) { |
51 |
|
oneRun(klass, i, items); |
52 |
|
if (i == k) { |
53 |
|
k = i << 1; |
54 |
|
i = i + (i >>> 1); |
55 |
< |
} |
56 |
< |
else |
55 |
> |
} |
56 |
> |
else |
57 |
|
i = k; |
58 |
|
} |
59 |
|
pool.shutdown(); |
60 |
< |
} |
60 |
> |
} |
61 |
|
|
62 |
|
static class Stage implements Callable<Integer> { |
63 |
|
final Deque<Integer> queue; |
64 |
|
final CyclicBarrier barrier; |
65 |
|
final LoopHelpers.SimpleRandom rng = new LoopHelpers.SimpleRandom(); |
66 |
|
int items; |
67 |
< |
Stage (Deque<Integer> q, CyclicBarrier b, int items) { |
68 |
< |
queue = q; |
67 |
> |
Stage(Deque<Integer> q, CyclicBarrier b, int items) { |
68 |
> |
queue = q; |
69 |
|
barrier = b; |
70 |
|
this.items = items; |
71 |
|
} |
75 |
|
// transform it, and put back in. |
76 |
|
try { |
77 |
|
barrier.await(); |
78 |
< |
int l = (int)System.nanoTime(); |
78 |
> |
int l = (int) System.nanoTime(); |
79 |
|
int takes = 0; |
80 |
|
for (;;) { |
81 |
|
Integer item; |
103 |
|
else |
104 |
|
queue.addLast(res); |
105 |
|
} |
106 |
< |
else { // spinwait |
106 |
> |
else { // spinwait |
107 |
|
for (int k = 1 + (l & 15); k != 0; --k) |
108 |
|
l = LoopHelpers.compute1(LoopHelpers.compute2(l)); |
109 |
|
if ((l & 3) == 3) { |
113 |
|
} |
114 |
|
return new Integer(l); |
115 |
|
} |
116 |
< |
catch (Exception ie) { |
116 |
> |
catch (Exception ie) { |
117 |
|
ie.printStackTrace(); |
118 |
|
throw new Error("Call loop failed"); |
119 |
|
} |
120 |
|
} |
121 |
|
} |
122 |
|
|
123 |
< |
static void oneRun(Class klass, int n, int items) throws Exception { |
124 |
< |
Deque<Integer> q = (Deque<Integer>)klass.newInstance(); |
123 |
> |
static void oneRun(Class<?> klass, int n, int items) throws Exception { |
124 |
> |
Deque<Integer> q = |
125 |
> |
(Deque<Integer>) klass.getConstructor().newInstance(); |
126 |
|
LoopHelpers.BarrierTimer timer = new LoopHelpers.BarrierTimer(); |
127 |
|
CyclicBarrier barrier = new CyclicBarrier(n + 1, timer); |
128 |
|
totalItems = new AtomicInteger(n * items); |
129 |
|
ArrayList<Future<Integer>> results = new ArrayList<Future<Integer>>(n); |
130 |
< |
for (int i = 0; i < n; ++i) |
130 |
> |
for (int i = 0; i < n; ++i) |
131 |
|
results.add(pool.submit(new Stage(q, barrier, items))); |
132 |
|
|
133 |
|
if (print) |
145 |
|
System.out.println(LoopHelpers.rightJustify(time / (items * n)) + " ns per item"); |
146 |
|
if (total == 0) // avoid overoptimization |
147 |
|
System.out.println("useless result: " + total); |
144 |
– |
|
148 |
|
} |
149 |
|
} |