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/*
* Copyright (c) 2023, Oracle and/or its affiliates. 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.
*/
/**
* @test
* @bug 8297638
* @summary JDI memory leak when creating and destroying many threads
*
* @comment Don't allow -Xcomp or -Xint as they impact memory useage and number of iterations
* @requires (vm.compMode == "Xmixed")
* @run build TestScaffold VMConnection TargetListener TargetAdapter
* @run compile -g ThreadMemoryLeakTest.java
* @comment run with -Xmx7m so any leak will quickly produce OOME
* @run main/othervm -Xmx7m ThreadMemoryLeakTest
*/
import com.sun.jdi.*;
import com.sun.jdi.event.*;
import com.sun.jdi.request.*;
import java.util.*;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Semaphore;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.LongAdder;
/********** target program **********/
class ThreadMemoryLeakTarg {
public static void main(String[] args) throws InterruptedException {
System.out.println("Howdy!");
Semaphore semaphore = new Semaphore(500);
LongAdder adder = new LongAdder();
long startTime = System.currentTimeMillis();
int iterations = 0;
// Run for 100 seconds
while (System.currentTimeMillis() - startTime < 100 * 1000) {
iterations++;
semaphore.acquire();
DebuggeeWrapper.newThread(() -> {
adder.increment();
long sum = adder.sum();
if ((sum % 1000) == 0) {
System.out.println("Progress: " + sum);
}
try {
// Virtual thread creation tends to overwhelm the debugger,
// leading to high memory use for all the unprocessed events
// that get queued up, so we need to slow it down a bit more
// than we do for platform threads to avoid getting OOME.
long timeToSleep = DebuggeeWrapper.isVirtual() ? 100 : 50;
Thread.sleep(timeToSleep);
}
catch (InterruptedException e) {
throw new RuntimeException(e);
} finally {
semaphore.release();
}
}).start();
}
System.out.println("Goodbye from ThreadMemoryLeakTarg after " + iterations + " iterations!");
}
}
/********** test program **********/
public class ThreadMemoryLeakTest extends TestScaffold {
StepRequest stepRequest = null;
EventRequestManager erm;
boolean mainIsDead;
ThreadMemoryLeakTest (String args[]) {
super(args);
}
public static void main(String[] args) throws Exception {
new ThreadMemoryLeakTest(args).startTests();
}
/********** event handlers **********/
static LongAdder threadStartCount = new LongAdder();
static LongAdder threadDeathCount = new LongAdder();
public void threadStarted(ThreadStartEvent event) {
threadStartCount.increment();
if ((threadStartCount.sum() % 1000) == 0) {
println("Got ThreadStartEvent #" + threadStartCount +
" threads:" + (threadStartCount.sum() - threadDeathCount.sum()));
}
}
public void threadDied(ThreadDeathEvent event) {
threadDeathCount.increment();
if ((threadDeathCount.sum() % 1000) == 0) {
println("Got ThreadDeathEvent #" + threadDeathCount +
" threads:" + (threadStartCount.sum() - threadDeathCount.sum()));
}
}
public void vmDied(VMDeathEvent event) {
println("Got VMDeathEvent");
}
public void vmDisconnected(VMDisconnectEvent event) {
println("Got VMDisconnectEvent");
}
/********** test core **********/
protected void runTests() throws Exception {
/*
* Launch debuggee and break at main() method.
*/
BreakpointEvent bpe = startToMain("ThreadMemoryLeakTarg");
/*
* Setup ThreadStart and ThreadDeath event requests. Note, SUSPEND_NONE is important
* for this test. Otherwise the memory leak described in 8297638 is not triggered.
* There can't be any events coming in that might result in a suspend since the
* resume will clear out the leak.
*/
erm = vm().eventRequestManager();
ThreadStartRequest tsrReq = erm.createThreadStartRequest();
ThreadDeathRequest tdrReq = erm.createThreadDeathRequest();
tsrReq.setSuspendPolicy(EventRequest.SUSPEND_NONE);
tdrReq.setSuspendPolicy(EventRequest.SUSPEND_NONE);
tsrReq.enable();
tdrReq.enable();
/*
* Resume the target and listen for events
*/
listenUntilVMDisconnect();
/*
* Any test failure will result in an exception or a timeout. So if we
* get here we passed.
*/
println("ThreadMemoryLeakTest: PASSED");
}
}
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