test/gc/TestSoftReferencesBehaviorOnOOME.java
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rev 7996 : 8073669: gc/TestSoftReferencesBehaviorOnOOME.java times out in nightlies
Summary: 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:
*** 24,105 ****
/**
* @test TestSoftReferencesBehaviorOnOOME
* @key gc
* @summary Tests that all SoftReferences has been cleared at time of OOM.
* @library /testlibrary
- * @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
*/
import com.oracle.java.testlibrary.Utils;
import java.lang.ref.SoftReference;
import java.util.LinkedList;
import java.util.Random;
public class TestSoftReferencesBehaviorOnOOME {
! private static final Random rndGenerator = Utils.getRandomInstance();
!
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]);
! }
if ( args.length >= 2) {
maxSize = getBytesCount(args[1]);
}
if ( args.length >= 1) {
minSize = getBytesCount(args[0]);
}
! new TestSoftReferencesBehaviorOnOOME().softReferencesOom(minSize, maxSize, semiRefAllocFrequency);
}
/**
* 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;
- 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;
}
}
} catch (OutOfMemoryError oome) {
- // Clear allocated ballast, so we don't get another OOM.
arrObjects = null;
!
! // Get the number of soft refs first, so we don't trigger
! // another OOM.
! oomSoftArraySize = arrSoftRefs.size();
for (SoftReference sr : arrSoftRefs) {
Object o = sr.get();
if (o != null) {
--- 24,109 ----
/**
* @test TestSoftReferencesBehaviorOnOOME
* @key gc
* @summary Tests that all SoftReferences has been cleared at time of OOM.
* @library /testlibrary
* @build TestSoftReferencesBehaviorOnOOME
* @run main/othervm -Xmx128m TestSoftReferencesBehaviorOnOOME 512 2k
* @run main/othervm -Xmx128m TestSoftReferencesBehaviorOnOOME 128k 256k
! * @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 {
! /**
! * 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) {
! long minSize = DEFAULT_MIN_SIZE;
! long maxSize = DEFAULT_MAX_SIZE;
if ( args.length >= 2) {
maxSize = getBytesCount(args[1]);
}
if ( args.length >= 1) {
minSize = getBytesCount(args[0]);
}
! new TestSoftReferencesBehaviorOnOOME().softReferencesOom(minSize, maxSize);
}
/**
* Test that all SoftReferences has been cleared at time of OOM.
*/
! 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;
long numberOfNotNulledObjects = 0;
try {
! // 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;
! long oomSoftArraySize = arrSoftRefs.size();
for (SoftReference sr : arrSoftRefs) {
Object o = sr.get();
if (o != null) {
*** 107,136 ****
}
}
// 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");
! }
} finally {
! arrSoftRefs = null;
! arrObjects = null;
}
}
private static final long getBytesCount(String arg) {
String postfixes = "kMGT";
long mod = 1;
if (arg.trim().length() >= 2) {
! mod = postfixes.indexOf(
! arg.trim().charAt(arg.length() - 1)
! );
if (mod != -1) {
mod = (long) Math.pow(1024, mod+1);
arg = arg.substring(0, arg.length() - 1);
} else {
--- 111,137 ----
}
}
// Make sure we clear all refs before we return failure
arrSoftRefs = null;
! Asserts.assertFalse(numberOfNotNulledObjects > 0,
! "" + numberOfNotNulledObjects + " out of "
+ oomSoftArraySize + " SoftReferences was not "
! + "null at time of OutOfMemoryError"
! );
} finally {
! Asserts.assertTrue(arrObjects == null, "OOME hasn't been provoked");
! Asserts.assertTrue(arrSoftRefs == null, "OOME hasn't been provoked");
}
}
private static final long getBytesCount(String arg) {
String postfixes = "kMGT";
long mod = 1;
if (arg.trim().length() >= 2) {
! mod = postfixes.indexOf(arg.trim().charAt(arg.length() - 1));
if (mod != -1) {
mod = (long) Math.pow(1024, mod+1);
arg = arg.substring(0, arg.length() - 1);
} else {
*** 139,147 ****
}
return Long.parseLong(arg) * mod;
}
private static final long DEFAULT_MIN_SIZE = 512;
private static final long DEFAULT_MAX_SIZE = 1024;
! private static final int DEFAULT_FREQUENCY = 4;
}
--- 140,149 ----
}
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 Object staticRef; // to prevent compile optimisations
}