RFR: 8267293: vmTestbase/vm/mlvm/anonloader/stress/oome/metaspace/Test.java fails when JTREG_JOBS > 25

[Aleksey Shipilev]

On Mon, 17 May 2021 23:28:43 GMT, Jie Fu <jiefu at openjdk.org> wrote:

> Hi all,
> 
> vmTestbase/vm/mlvm/anonloader/stress/oome/metaspace/Test.java fails on our many-core machines due to `-XX:MaxRAMPercentage=0`.
> This is because `-XX:MaxRAMPercentage=0` will be 0 if JTREG_JOBS > 25 [1].
> 
> We can also reproduce the bug by: `make test TEST="vmTestbase/vm/mlvm/anonloader/stress/oome/metaspace/Test.java" JTREG="JOBS=26"` on almost all machines.
> 
> This fix will make it to be more robust, which is suggested by  @shipilev [2] and many thanks to him.
> 
> Thanks.
> Best regards,
> Jie
> 
> [1] https://github.com/openjdk/jdk/blob/master/make/RunTests.gmk#L741
> [2] https://github.com/openjdk/jdk/pull/4062#pullrequestreview-661198240

Yeah, this works on my machines:


diff --git a/test/hotspot/jtreg/vmTestbase/vm/mlvm/anonloader/stress/oome/metaspace/Test.java b/test/hotspot/jtreg/vmTestbase/vm/mlvm/anonloader/stress/oome/metaspace/Test.java
index 0d5f1a1626f..980c9303f04 100644
--- a/test/hotspot/jtreg/vmTestbase/vm/mlvm/anonloader/stress/oome/metaspace/Test.java
+++ b/test/hotspot/jtreg/vmTestbase/vm/mlvm/anonloader/stress/oome/metaspace/Test.java
@@ -36,7 +36,7 @@
  * @build vm.mlvm.anonloader.stress.oome.metaspace.Test
  * @run driver vm.mlvm.share.IndifiedClassesBuilder
  *
- * @run main/othervm -XX:-UseGCOverheadLimit -XX:MetaspaceSize=10m -XX:MaxMetaspaceSize=20m vm.mlvm.anonloader.stress.oome.metaspace.Test
+ * @run main/othervm -Xmx256m -XX:-UseGCOverheadLimit -XX:MaxMetaspaceSize=8m vm.mlvm.anonloader.stress.oome.metaspace.Test
  */
 
 package vm.mlvm.anonloader.stress.oome.metaspace;

-------------

PR: https://git.openjdk.java.net/jdk/pull/4076