| 1 |
|
/* |
| 2 |
– |
* @test %I% %E% |
| 3 |
– |
* @bug 4486658 |
| 4 |
– |
* @compile -source 1.5 ConcurrentQueueLoops.java |
| 5 |
– |
* @run main/timeout=230 ConcurrentQueueLoops |
| 6 |
– |
* @summary Checks that a set of threads can repeatedly get and modify items |
| 7 |
– |
*/ |
| 8 |
– |
/* |
| 2 |
|
* Written by Doug Lea with assistance from members of JCP JSR-166 |
| 3 |
< |
* Expert Group and released to the public domain. Use, modify, and |
| 4 |
< |
* redistribute this code in any way without acknowledgement. |
| 3 |
> |
* Expert Group and released to the public domain, as explained at |
| 4 |
> |
* http://creativecommons.org/publicdomain/zero/1.0/ |
| 5 |
|
*/ |
| 6 |
|
|
| 7 |
|
import java.util.*; |
| 8 |
|
import java.util.concurrent.*; |
| 16 |
– |
import java.util.concurrent.locks.*; |
| 9 |
|
import java.util.concurrent.atomic.*; |
| 10 |
+ |
import java.util.concurrent.locks.*; |
| 11 |
|
|
| 12 |
|
public class ConcurrentQueueLoops { |
| 13 |
|
static final ExecutorService pool = Executors.newCachedThreadPool(); |
| 14 |
|
static boolean print = false; |
| 15 |
< |
static final Integer even = new Integer(42); |
| 16 |
< |
static final Integer odd = new Integer(17); |
| 15 |
> |
static final Integer zero = new Integer(0); |
| 16 |
> |
static final Integer one = new Integer(1); |
| 17 |
|
static int workMask; |
| 18 |
|
static final long RUN_TIME_NANOS = 5 * 1000L * 1000L * 1000L; |
| 19 |
+ |
static final int BATCH_SIZE = 8; |
| 20 |
|
|
| 21 |
|
public static void main(String[] args) throws Exception { |
| 22 |
< |
int maxStages = 48; |
| 23 |
< |
int work = 32; |
| 24 |
< |
Class klass = null; |
| 22 |
> |
int maxStages = 100; |
| 23 |
> |
int work = 1024; |
| 24 |
> |
Class<?> klass = null; |
| 25 |
|
if (args.length > 0) { |
| 26 |
|
try { |
| 27 |
|
klass = Class.forName(args[0]); |
| 28 |
< |
} catch(ClassNotFoundException e) { |
| 28 |
> |
} catch (ClassNotFoundException e) { |
| 29 |
|
throw new RuntimeException("Class " + args[0] + " not found."); |
| 30 |
|
} |
| 31 |
|
} |
| 32 |
|
|
| 33 |
< |
if (args.length > 1) |
| 33 |
> |
if (args.length > 1) |
| 34 |
|
maxStages = Integer.parseInt(args[1]); |
| 35 |
|
|
| 36 |
< |
if (args.length > 2) |
| 36 |
> |
if (args.length > 2) |
| 37 |
|
work = Integer.parseInt(args[2]); |
| 38 |
|
|
| 39 |
|
workMask = work - 1; |
| 43 |
|
|
| 44 |
|
print = false; |
| 45 |
|
System.out.println("Warmup..."); |
| 46 |
< |
oneRun(klass, 4); |
| 46 |
> |
// oneRun(klass, 4); |
| 47 |
> |
// |
| 48 |
|
Thread.sleep(100); |
| 49 |
|
oneRun(klass, 1); |
| 50 |
|
Thread.sleep(100); |
| 51 |
|
print = true; |
| 52 |
|
|
| 53 |
< |
int k = 1; |
| 59 |
< |
for (int i = 1; i <= maxStages;) { |
| 53 |
> |
for (int k = 1, i = 1; i <= maxStages;) { |
| 54 |
|
oneRun(klass, i); |
| 55 |
|
if (i == k) { |
| 56 |
|
k = i << 1; |
| 57 |
|
i = i + (i >>> 1); |
| 58 |
< |
} |
| 59 |
< |
else |
| 58 |
> |
} |
| 59 |
> |
else |
| 60 |
|
i = k; |
| 61 |
|
} |
| 62 |
|
pool.shutdown(); |
| 63 |
< |
} |
| 63 |
> |
} |
| 64 |
|
|
| 65 |
|
static final class Stage implements Callable<Integer> { |
| 66 |
|
final Queue<Integer> queue; |
| 67 |
|
final CyclicBarrier barrier; |
| 68 |
< |
Stage (Queue<Integer> q, CyclicBarrier b) { |
| 69 |
< |
queue = q; |
| 68 |
> |
final int nthreads; |
| 69 |
> |
Stage(Queue<Integer> q, CyclicBarrier b, int nthreads) { |
| 70 |
> |
queue = q; |
| 71 |
|
barrier = b; |
| 72 |
< |
} |
| 78 |
< |
|
| 79 |
< |
static int compute127(int l) { |
| 80 |
< |
l = LoopHelpers.compute1(l); |
| 81 |
< |
l = LoopHelpers.compute2(l); |
| 82 |
< |
l = LoopHelpers.compute3(l); |
| 83 |
< |
l = LoopHelpers.compute4(l); |
| 84 |
< |
l = LoopHelpers.compute5(l); |
| 85 |
< |
l = LoopHelpers.compute6(l); |
| 86 |
< |
return l; |
| 72 |
> |
this.nthreads = nthreads; |
| 73 |
|
} |
| 74 |
|
|
| 75 |
|
static int compute(int l) { |
| 76 |
< |
if (l == 0) |
| 77 |
< |
return (int)System.nanoTime(); |
| 78 |
< |
int nn = l & workMask; |
| 79 |
< |
while (nn-- > 0) |
| 80 |
< |
l = compute127(l); |
| 76 |
> |
if (l == 0) |
| 77 |
> |
return (int) System.nanoTime(); |
| 78 |
> |
int nn = (l >>> 7) & workMask; |
| 79 |
> |
while (nn-- > 0) |
| 80 |
> |
l = LoopHelpers.compute6(l); |
| 81 |
|
return l; |
| 82 |
|
} |
| 83 |
|
|
| 86 |
|
barrier.await(); |
| 87 |
|
long now = System.nanoTime(); |
| 88 |
|
long stopTime = now + RUN_TIME_NANOS; |
| 89 |
< |
int l = (int)now; |
| 89 |
> |
int l = (int) now; |
| 90 |
|
int takes = 0; |
| 91 |
|
int misses = 0; |
| 92 |
+ |
int lmask = 1; |
| 93 |
|
for (;;) { |
| 94 |
|
l = compute(l); |
| 95 |
|
Integer item = queue.poll(); |
| 96 |
|
if (item != null) { |
| 110 |
– |
l += item.intValue(); |
| 97 |
|
++takes; |
| 98 |
+ |
if (item == one) |
| 99 |
+ |
l = LoopHelpers.compute6(l); |
| 100 |
|
} else if ((misses++ & 255) == 0 && |
| 101 |
|
System.nanoTime() >= stopTime) { |
| 102 |
< |
break; |
| 102 |
> |
return Integer.valueOf(takes); |
| 103 |
|
} else { |
| 104 |
< |
Integer a = ((l++ & 4)== 0)? even : odd; |
| 105 |
< |
queue.add(a); |
| 104 |
> |
for (int i = 0; i < BATCH_SIZE; ++i) { |
| 105 |
> |
queue.offer(((l & lmask)== 0) ? zero : one); |
| 106 |
> |
if ((lmask <<= 1) == 0) lmask = 1; |
| 107 |
> |
if (i != 0) l = compute(l); |
| 108 |
> |
} |
| 109 |
|
} |
| 110 |
|
} |
| 120 |
– |
return new Integer(takes); |
| 111 |
|
} |
| 112 |
< |
catch (Exception ie) { |
| 112 |
> |
catch (Exception ie) { |
| 113 |
|
ie.printStackTrace(); |
| 114 |
|
throw new Error("Call loop failed"); |
| 115 |
|
} |
| 116 |
|
} |
| 117 |
|
} |
| 118 |
|
|
| 119 |
< |
static void oneRun(Class klass, int n) throws Exception { |
| 120 |
< |
Queue<Integer> q = (Queue<Integer>)klass.newInstance(); |
| 119 |
> |
static void oneRun(Class<?> klass, int n) throws Exception { |
| 120 |
> |
Queue<Integer> q = (Queue<Integer>) klass.newInstance(); |
| 121 |
|
LoopHelpers.BarrierTimer timer = new LoopHelpers.BarrierTimer(); |
| 122 |
|
CyclicBarrier barrier = new CyclicBarrier(n + 1, timer); |
| 123 |
|
ArrayList<Future<Integer>> results = new ArrayList<Future<Integer>>(n); |
| 124 |
< |
for (int i = 0; i < n; ++i) |
| 125 |
< |
results.add(pool.submit(new Stage(q, barrier))); |
| 124 |
> |
for (int i = 0; i < n; ++i) |
| 125 |
> |
results.add(pool.submit(new Stage(q, barrier, n))); |
| 126 |
|
|
| 127 |
|
if (print) |
| 128 |
|
System.out.print("Threads: " + n + "\t:"); |
| 135 |
|
} |
| 136 |
|
long endTime = System.nanoTime(); |
| 137 |
|
long time = endTime - timer.startTime; |
| 138 |
< |
long tpi = time / total; |
| 138 |
> |
long ips = 1000000000L * total / time; |
| 139 |
> |
|
| 140 |
> |
if (print) |
| 141 |
> |
System.out.print(LoopHelpers.rightJustify(ips) + " items per sec"); |
| 142 |
|
if (print) |
| 143 |
< |
System.out.println(LoopHelpers.rightJustify(tpi) + " ns per item"); |
| 151 |
< |
|
| 143 |
> |
System.out.println(); |
| 144 |
|
} |
| 145 |
|
|
| 146 |
|
} |
