8323296: java/lang/Thread/virtual/stress/GetStackTraceALotWhenPinned.java#id1 timed out
Reviewed-by: jpai
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@ -26,30 +26,44 @@
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* @bug 8322818
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* @summary Stress test Thread.getStackTrace on a virtual thread that is pinned
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* @requires vm.debug != true
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* @run main GetStackTraceALotWhenPinned 25000
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* @modules java.base/java.lang:+open
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* @library /test/lib
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* @run main/othervm GetStackTraceALotWhenPinned 500000
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*/
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/*
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* @test
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* @requires vm.debug == true
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* @run main/timeout=300 GetStackTraceALotWhenPinned 10000
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* @modules java.base/java.lang:+open
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* @library /test/lib
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* @run main/othervm/timeout=300 GetStackTraceALotWhenPinned 200000
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*/
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import java.time.Instant;
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import java.util.concurrent.atomic.AtomicInteger;
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import java.util.concurrent.locks.LockSupport;
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import jdk.test.lib.thread.VThreadRunner;
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public class GetStackTraceALotWhenPinned {
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public static void main(String[] args) throws Exception {
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var counter = new AtomicInteger(Integer.parseInt(args[0]));
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// need at least two carrier threads when main thread is a virtual thread
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if (Thread.currentThread().isVirtual()) {
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VThreadRunner.ensureParallelism(2);
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}
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int iterations = Integer.parseInt(args[0]);
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var barrier = new Barrier(2);
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// Start a virtual thread that loops doing Thread.yield and parking while pinned.
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// This loop creates the conditions for the main thread to sample the stack trace
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// as it transitions from being unmounted to parking while pinned.
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var thread = Thread.startVirtualThread(() -> {
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boolean timed = false;
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while (counter.decrementAndGet() > 0) {
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for (int i = 0; i < iterations; i++) {
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// wait for main thread to arrive
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barrier.await();
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Thread.yield();
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synchronized (GetStackTraceALotWhenPinned.class) {
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if (timed) {
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@ -63,14 +77,47 @@ public class GetStackTraceALotWhenPinned {
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});
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long lastTimestamp = System.currentTimeMillis();
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while (thread.isAlive()) {
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for (int i = 0; i < iterations; i++) {
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// wait for virtual thread to arrive
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barrier.await();
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thread.getStackTrace();
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LockSupport.unpark(thread);
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long currentTime = System.currentTimeMillis();
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if ((currentTime - lastTimestamp) > 500) {
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System.out.format("%s %d remaining ...%n", Instant.now(), counter.get());
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System.out.format("%s %d remaining ...%n", Instant.now(), (iterations - i));
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lastTimestamp = currentTime;
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}
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}
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}
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/**
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* Alow threads wait for each other to reach a common barrier point. This class does
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* not park threads that are waiting for the barrier to trip, instead it spins. This
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* makes it suitable for tests that use LockSupport.park or Thread.yield.
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*/
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private static class Barrier {
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private final int parties;
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private final AtomicInteger count;
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private volatile int generation;
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Barrier(int parties) {
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this.parties = parties;
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this.count = new AtomicInteger(parties);
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}
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void await() {
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int g = generation;
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if (count.decrementAndGet() == 0) {
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count.set(parties);
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generation = g + 1;
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} else {
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while (generation == g) {
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Thread.onSpinWait();
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}
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}
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}
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}
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}
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