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8073669: gc/TestSoftReferencesBehaviorOnOOME.java times out in nightlies

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Changed test scenario to more straight-forward one, added tricks to prevent compiler optimizations and added checks when OOME didn't thrown as expected.

Reviewed-by: tschatzl, jwilhelm
This commit is contained in:
Andrey Zakharov 2015-04-23 15:54:47 +02:00
parent 7d01ef4a6e
commit d50c630d1b
1 changed files with 50 additions and 48 deletions
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98
hotspot/test/gc/TestSoftReferencesBehaviorOnOOME.java
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@ -28,29 +28,30 @@
* @library /testlibrary
* @modules java.base/sun.misc
* java.management
* @ignore 8073669
* @build TestSoftReferencesBehaviorOnOOME
* @run main/othervm -Xmx128m TestSoftReferencesBehaviorOnOOME 512 2k
* @run main/othervm -Xmx128m TestSoftReferencesBehaviorOnOOME 128k 256k
* @run main/othervm -Xmx128m TestSoftReferencesBehaviorOnOOME 2k 32k 10
* @run main/othervm -Xmx128m TestSoftReferencesBehaviorOnOOME 2k 32k
*/
import com.oracle.java.testlibrary.Utils;
import com.oracle.java.testlibrary.Asserts;
import java.lang.ref.SoftReference;
import java.util.LinkedList;
import java.util.Random;
public class TestSoftReferencesBehaviorOnOOME {
private static final Random rndGenerator = Utils.getRandomInstance();
/**
* Test generates a lot of soft references to objects with random payloads.
* Then it provokes OOME and checks that all SoftReferences has been gone
* @param args - [minSize] [maxSize] [freq]
* where
* - minSize - min size of random objects
* - maxSize - max size of random objects
*/
public static void main(String[] args) {
int semiRefAllocFrequency = DEFAULT_FREQUENCY;
long minSize = DEFAULT_MIN_SIZE,
maxSize = DEFAULT_MAX_SIZE;
if ( args.length >= 3 ) {
semiRefAllocFrequency = Integer.parseInt(args[2]);
}
long minSize = DEFAULT_MIN_SIZE;
long maxSize = DEFAULT_MAX_SIZE;
if ( args.length >= 2) {
maxSize = getBytesCount(args[1]);
@ -60,46 +61,49 @@ public class TestSoftReferencesBehaviorOnOOME {
minSize = getBytesCount(args[0]);
}
new TestSoftReferencesBehaviorOnOOME().softReferencesOom(minSize, maxSize, semiRefAllocFrequency);
new TestSoftReferencesBehaviorOnOOME().softReferencesOom(minSize, maxSize);
}
/**
* Test that all SoftReferences has been cleared at time of OOM.
*/
void softReferencesOom(long minSize, long maxSize, int semiRefAllocFrequency) {
System.out.format( "minSize = %d, maxSize = %d, freq = %d%n", minSize, maxSize, semiRefAllocFrequency );
long counter = 0;
void softReferencesOom(long minSize, long maxSize) {
System.out.format( "minSize = %d, maxSize = %d%n", minSize, maxSize );
LinkedList<SoftReference> arrSoftRefs = new LinkedList();
staticRef = arrSoftRefs;
LinkedList arrObjects = new LinkedList();
staticRef = arrObjects;
long multiplier = maxSize - minSize;
LinkedList<SoftReference> arrSoftRefs = new LinkedList();
LinkedList arrObjects = new LinkedList();
long numberOfNotNulledObjects = 0;
long oomSoftArraySize = 0;
try {
while (true) {
// Keep every Xth object to make sure we hit OOM pretty fast
if (counter % semiRefAllocFrequency != 0) {
long allocationSize = ((int) (rndGenerator.nextDouble() * multiplier))
+ minSize;
arrObjects.add(new byte[(int)allocationSize]);
} else {
arrSoftRefs.add(new SoftReference(new Object()));
}
counter++;
if (counter == Long.MAX_VALUE) {
counter = 0;
}
// Lets allocate as many as we can - taking size of all SoftRerefences
// by minimum. So it can provoke some GC but we surely will allocate enough.
long numSofts = (long) ((0.95 * Runtime.getRuntime().totalMemory()) / minSize);
System.out.println("num Soft: " + numSofts);
while (numSofts-- > 0) {
int allocationSize = ((int) (RND_GENERATOR.nextDouble() * multiplier))
+ (int)minSize;
arrSoftRefs.add(new SoftReference(new byte[allocationSize]));
}
System.out.println("free: " + Runtime.getRuntime().freeMemory());
// provoke OOME.
while (true) {
arrObjects.add(new byte[(int) Runtime.getRuntime().totalMemory()]);
}
} catch (OutOfMemoryError oome) {
// Clear allocated ballast, so we don't get another OOM.
staticRef = null;
arrObjects = null;
// Get the number of soft refs first, so we don't trigger
// another OOM.
oomSoftArraySize = arrSoftRefs.size();
long oomSoftArraySize = arrSoftRefs.size();
for (SoftReference sr : arrSoftRefs) {
Object o = sr.get();
@ -111,15 +115,14 @@ public class TestSoftReferencesBehaviorOnOOME {
// Make sure we clear all refs before we return failure
arrSoftRefs = null;
if (numberOfNotNulledObjects > 0) {
throw new RuntimeException(numberOfNotNulledObjects + " out of "
+ oomSoftArraySize + " SoftReferences was not "
+ "null at time of OutOfMemoryError");
}
Asserts.assertFalse(numberOfNotNulledObjects > 0,
"" + numberOfNotNulledObjects + " out of "
+ oomSoftArraySize + " SoftReferences was not "
+ "null at time of OutOfMemoryError"
);
} finally {
arrSoftRefs = null;
arrObjects = null;
Asserts.assertTrue(arrObjects == null, "OOME hasn't been provoked");
Asserts.assertTrue(arrSoftRefs == null, "OOME hasn't been provoked");
}
}
@ -128,9 +131,7 @@ public class TestSoftReferencesBehaviorOnOOME {
long mod = 1;
if (arg.trim().length() >= 2) {
mod = postfixes.indexOf(
arg.trim().charAt(arg.length() - 1)
);
mod = postfixes.indexOf(arg.trim().charAt(arg.length() - 1));
if (mod != -1) {
mod = (long) Math.pow(1024, mod+1);
@ -143,7 +144,8 @@ public class TestSoftReferencesBehaviorOnOOME {
return Long.parseLong(arg) * mod;
}
private static final Random RND_GENERATOR = Utils.getRandomInstance();
private static final long DEFAULT_MIN_SIZE = 512;
private static final long DEFAULT_MAX_SIZE = 1024;
private static final int DEFAULT_FREQUENCY = 4;
private static Object staticRef; // to prevent compile optimisations
}