Kann das Experiment über den RA -Modus von J9mm nicht reproduzieren ⇐ Java

[Anonymous]

Ich habe versucht, das Experiment über "Release/Accire" aus Doug Lea's Blog auf J9mm (https://gee.cs.oswego.edu/dl/html/j9mm.html#summarysec):
volatile int ready; // Initially 0, with VarHandle READY
int dinner; // mode does not matter here

Thread 1 | Thread 2
dinner = 17; | if (READY.getAcquire(this) == 1)
READY.setRelease(this, 1); | int d = dinner; // sees 17

< /code>
Es war mir jedoch nicht erfolgreich, die ursprünglichen Ergebnisse zu reproduzieren: < /p>

Code: Select all

Java Concurrency Stress Tests
---------------------------------------------------------------------------------
...

RESULT     SAMPLES     FREQ       EXPECT  DESCRIPTION
0     462,012    1.69%  Interesting
17  26,856,279   98.31%  Interesting
...

RESULT        SAMPLES     FREQ       EXPECT  DESCRIPTION
0  1,027,953,599   44.29%  Interesting
17  1,292,906,829   55.71%  Interesting
...

Die richtige Situation sollte nicht zu 0 führen.

Code: Select all

@JCStressTest
@State
@Outcome(id = {"17"}, expect = ACCEPTABLE_INTERESTING)
@Outcome(id = {"0"}, expect = ACCEPTABLE_INTERESTING)
public class TestRA {

volatile int ready;
int dinner;
static final VarHandle READY;
static {
try {
READY = MethodHandles.lookup()
.findVarHandle(TestRA.class, "ready", int.class);
} catch (NoSuchFieldException | IllegalAccessException e) {
throw new RuntimeException(e);
}
}
@Actor
public void actor1(I_Result result) {
final int i = (int) READY.getAcquire(this);
if (i == 1) {
result.r1 = dinner;
}
}
@Actor
public void actor2() {
dinner = 17;
READY.setRelease(this, 1);
}
}

env:

• OS: Windows 11
• cpu platform: x86_64
• jdk: graalvm-17 (17.0.7)