# HG changeset patch
# User zgu
# Date 1578939259 18000
#      Mon Jan 13 13:14:19 2020 -0500
# Node ID 4a873cdbce06da19c24d43f5d5ca57926a8c2ead
# Parent  9338d0f52b2ebb5ea7ff7c5af8c4db150e88dcac
8237038: Shenandoah: Reduce thread pool size in TestEvilSyncBug.java test

diff --git a/test/hotspot/jtreg/gc/shenandoah/TestEvilSyncBug.java b/test/hotspot/jtreg/gc/shenandoah/TestEvilSyncBug.java
--- a/test/hotspot/jtreg/gc/shenandoah/TestEvilSyncBug.java
+++ b/test/hotspot/jtreg/gc/shenandoah/TestEvilSyncBug.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016, 2018, Red Hat, Inc. All rights reserved.
+ * Copyright (c) 2016, 2020, Red Hat, Inc. All rights reserved.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
@@ -49,8 +49,10 @@
         if (args.length > 0) {
             test();
         } else {
-            ExecutorService pool = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());
-
+            // Use 1/4 of available processors to avoid over provisioning thread pool on many core
+            // systems.
+            int numProcessors = Runtime.getRuntime().availableProcessors();
+            ExecutorService pool = Executors.newFixedThreadPool(Math.max(1, numProcessors / 4));
             Future<?>[] fs = new Future<?>[NUM_RUNS];
 
             for (int c = 0; c < NUM_RUNS; c++) {