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8386872: Test gc/shenandoah/generational/TestOldGrowthTriggers still fails intermittently

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Reviewed-by: wkemper, kdnilsen
This commit is contained in:
Patrick Fontanilla 2026-07-09 22:34:25 +00:00 committed by Xiaolong Peng
parent 4d3723b802
commit cd7b5fc7a5
1 changed files with 13 additions and 5 deletions
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18
test/hotspot/jtreg/gc/shenandoah/generational/TestOldGrowthTriggers.java
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@ -41,9 +41,11 @@ import jdk.test.lib.process.OutputAnalyzer;
public class TestOldGrowthTriggers {
public static void makeOldAllocations() {
// Expect most of the BitSet entries placed into array to be promoted, and most will eventually become garbage within old
// Keep the majority of BitSet entries (5/8, 960) long-lived so they promote and grow old generation
// well past the old GC trigger threshold. A smaller long-lived set can fall just short and only
// intermittently trigger an old GC, so don't reduce the array size or the promoted fraction.
final int ArraySize = 1024; // 1K entries
final int ArraySize = 1536; // 1536 entries (1024 + 512)
final int RefillIterations = 128;
BitSet[] array = new BitSet[ArraySize];
@ -57,8 +59,10 @@ public class TestOldGrowthTriggers {
int replaceIndex = i;
int deriveIndex = i-1;
// 3/8 entries are replaced each pass to trigger young gcs.
// 5/8 entries are never touched, so they age each cycle.
switch (i & 0x7) {
case 0,1,2 -> {
case 0,1 -> {
// creates new BitSet, releases old BitSet,
// create ephemeral data while computing
BitSet result = (BitSet) array[deriveIndex].clone();
@ -67,12 +71,12 @@ public class TestOldGrowthTriggers {
}
array[replaceIndex] = result;
}
case 3,4 -> {
case 2 -> {
// creates new BitSet, releases old BitSet
BitSet result = (BitSet) array[deriveIndex].clone();
array[replaceIndex] = result;
}
case 5,6,7 -> {
default -> {
// do nothing, let all objects in the array age to increase pressure on old generation
}
}
@ -110,6 +114,8 @@ public class TestOldGrowthTriggers {
"-XX:ShenandoahMinOldGenGrowthRemainingHeapPercent=100",
"-XX:ShenandoahGuaranteedYoungGCInterval=0",
"-XX:ShenandoahGuaranteedOldGCInterval=0",
"-XX:ShenandoahGenerationalMinTenuringAge=2",
"-XX:ShenandoahGenerationalMaxTenuringAge=2",
"-XX:-UseCompactObjectHeaders"
);
@ -127,6 +133,8 @@ public class TestOldGrowthTriggers {
"-XX:ShenandoahMinOldGenGrowthRemainingHeapPercent=100",
"-XX:ShenandoahGuaranteedYoungGCInterval=0",
"-XX:ShenandoahGuaranteedOldGCInterval=0",
"-XX:ShenandoahGenerationalMinTenuringAge=2",
"-XX:ShenandoahGenerationalMaxTenuringAge=2",
"-XX:+UseCompactObjectHeaders"
);
}