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/*
* Copyright (c) 2017, 2018, Red Hat, Inc. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* 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
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package gc.epsilon;
/**
* @test TestManyThreads
* @requires vm.gc.Epsilon
* @summary Test allocations from many threads
*
* @run main/othervm -XX:-UseTLAB -Xmx256m -Xss512k
* -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC
* gc.epsilon.TestManyThreads
*
* @run main/othervm -XX:-UseTLAB -Xmx256m -Xss512k
* -Xint
* -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC
* gc.epsilon.TestManyThreads
*
* @run main/othervm -XX:-UseTLAB -Xmx256m -Xss512k
* -Xbatch -Xcomp -XX:TieredStopAtLevel=1
* -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC
* gc.epsilon.TestManyThreads
*
* @run main/othervm -XX:-UseTLAB -Xmx256m -Xss512k
* -Xbatch -Xcomp -XX:-TieredCompilation
* -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC
* gc.epsilon.TestManyThreads
*
* @run main/othervm -XX:+UseTLAB -Xmx256m -Xss512k
* -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC
* gc.epsilon.TestManyThreads
*
* @run main/othervm -XX:+UseTLAB -Xmx256m -Xss512k
* -Xint
* -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC
* gc.epsilon.TestManyThreads
*
* @run main/othervm -XX:+UseTLAB -Xmx256m -Xss512k
* -Xbatch -Xcomp -XX:TieredStopAtLevel=1
* -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC
* gc.epsilon.TestManyThreads
*
* @run main/othervm -XX:+UseTLAB -Xmx256m -Xss512k
* -Xbatch -Xcomp -XX:-TieredCompilation
* -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC
* gc.epsilon.TestManyThreads
*/
import java.util.concurrent.atomic.*;
public class TestManyThreads {
static int COUNT = Integer.getInteger("count", 128); // 128 * 4M max tlabs = 512M, would overflow without TLAB sizing
static volatile Object sink;
static volatile Throwable failed;
static final AtomicInteger allocated = new AtomicInteger();
public static void workload() {
try {
sink = new Object();
allocated.incrementAndGet();
Thread.sleep(3600 * 1000);
} catch (Throwable e) {
failed = e;
}
}
public static void main(String[] args) throws Throwable {
for (int c = 0; c < COUNT; c++) {
Thread t = new Thread(TestManyThreads::workload);
t.setDaemon(true);
t.start();
}
while ((failed == null) && (allocated.get() != COUNT)) {
Thread.sleep(100);
}
if (failed != null) {
throw failed;
}
}
}
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