diff --git a/lucene/core/src/test/org/apache/lucene/index/TestDocumentsWriterStallControl.java b/lucene/core/src/test/org/apache/lucene/index/TestDocumentsWriterStallControl.java
index ee34a62..9b25525 100644
--- a/lucene/core/src/test/org/apache/lucene/index/TestDocumentsWriterStallControl.java
+++ b/lucene/core/src/test/org/apache/lucene/index/TestDocumentsWriterStallControl.java
@@ -145,7 +145,8 @@ public class TestDocumentsWriterStallControl extends LuceneTestCase {
     }
     
     start(threads);
-    int iters = atLeast(20000);
+    int iters = atLeast(10000);
+    final float checkPointProbability = TEST_NIGHTLY ? 0.8f : 0.1f;
     for (int i = 0; i < iters; i++) {
       if (checkPoint.get()) {
        
@@ -169,7 +170,7 @@ public class TestDocumentsWriterStallControl extends LuceneTestCase {
       }
       assertFalse(checkPoint.get());
       assertEquals(0, sync.waiter.getCount());
-      if (random().nextInt(2) == 0) {
+      if (checkPointProbability >= random().nextFloat()) {
         sync.reset(numStallers + numReleasers, numStallers + numReleasers
             + numWaiters);
         checkPoint.set(true);