From 6e1da6440b898d8a10b3db56707a75f32a489149 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christoph=20G=C3=B6ttschkes?= <cgo@openjdk.org>
Date: Wed, 28 Jul 2021 14:49:02 +0000
Subject: [PATCH] 8270908: TestParallelRefProc fails on single core machines

Reviewed-by: tschatzl, kbarrett
---
 test/hotspot/jtreg/gc/arguments/TestParallelRefProc.java | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/test/hotspot/jtreg/gc/arguments/TestParallelRefProc.java b/test/hotspot/jtreg/gc/arguments/TestParallelRefProc.java
index 2af16cf506e..6e50a17fb12 100644
--- a/test/hotspot/jtreg/gc/arguments/TestParallelRefProc.java
+++ b/test/hotspot/jtreg/gc/arguments/TestParallelRefProc.java
@@ -51,7 +51,9 @@ public class TestParallelRefProc {
         }
         if (GC.Parallel.isSupported()) {
             noneGCSupported = false;
-            testFlag(new String[] { "-XX:+UseParallelGC" }, true);
+            testFlag(new String[] { "-XX:+UseParallelGC", "-XX:ParallelGCThreads=1" }, false);
+            testFlag(new String[] { "-XX:+UseParallelGC", "-XX:ParallelGCThreads=2" }, true);
+            testFlag(new String[] { "-XX:+UseParallelGC", "-XX:-ParallelRefProcEnabled", "-XX:ParallelGCThreads=2" }, false);
         }
         if (GC.G1.isSupported()) {
             noneGCSupported = false;