185 lines
7.8 KiB
Java
185 lines
7.8 KiB
Java
/*
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* Copyright (c) 2022 SAP SE. All rights reserved.
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* Copyright (c) 2022, 2024, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import jdk.test.lib.process.OutputAnalyzer;
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import jdk.test.lib.process.ProcessTools;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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import java.util.concurrent.CyclicBarrier;
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import static jdk.test.lib.Platform.isLinux;
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import static jdk.test.lib.Platform.isWindows;
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/*
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* @test id=preTouchTest
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* @summary Test AlwaysPreTouchThreadStacks
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* @requires os.family != "aix"
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* @library /test/lib
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* @modules java.base/jdk.internal.misc
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* java.management
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* @run driver TestAlwaysPreTouchStacks preTouch
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*/
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public class TestAlwaysPreTouchStacks {
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// We will create a bunch of large-stacked threads to make a significant imprint on combined thread stack size
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final static int MB = 1024 * 1024;
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static int memoryCeilingMB = 128;
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static int threadStackSizeMB = 8;
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static int numThreads = memoryCeilingMB / threadStackSizeMB;
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static long min_stack_usage_with_pretouch = 1 * MB;
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static long max_stack_usage_with_pretouch = (long)(0.75 * threadStackSizeMB * MB);
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static CyclicBarrier gate = new CyclicBarrier(numThreads + 1);
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static private final Thread createTestThread(int num) {
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Thread t = new Thread(null,
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() -> {
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System.out.println("Alive: " + num);
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try {
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// report aliveness, then sleep until VM death
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gate.await();
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for (;;) {
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Thread.sleep(1000);
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}
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} catch (Exception e) {
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e.printStackTrace();
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}
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},
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"TestThread-" + num, threadStackSizeMB * MB);
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// Let test threads run as daemons to ensure that they are still running and
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// that their stacks are still allocated when the JVM shuts down and the final
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// NMT report is printed.
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t.setDaemon(true);
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return t;
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}
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private static long runPreTouchTest(boolean preTouch) throws Exception {
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long reserved = 0L, committed = 0L;
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ArrayList<String> vmArgs = new ArrayList<>();
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Collections.addAll(vmArgs,
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"-XX:+UnlockDiagnosticVMOptions",
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"-Xmx100M",
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"-XX:NativeMemoryTracking=summary", "-XX:+PrintNMTStatistics");
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if (preTouch){
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vmArgs.add("-XX:+AlwaysPreTouchStacks");
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}
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if (System.getProperty("os.name").contains("Linux")) {
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vmArgs.add("-XX:-UseMadvPopulateWrite");
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}
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Collections.addAll(vmArgs, "TestAlwaysPreTouchStacks", "test");
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ProcessBuilder pb = ProcessTools.createTestJavaProcessBuilder(vmArgs);
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OutputAnalyzer output = new OutputAnalyzer(pb.start());
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output.shouldHaveExitValue(0);
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for (int i = 0; i < numThreads; i++) {
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output.shouldContain("Alive: " + i);
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}
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// If using -XX:+AlwaysPreTouchStacks, we want to see, in the final NMT printout,
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// a committed thread stack size very close to reserved stack size. Like this:
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// - Thread (reserved=10332400KB, committed=10284360KB)
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// (thread #10021)
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// (stack: reserved=10301560KB, committed=10253520KB) <<<<
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//
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// ... without -XX:+AlwaysPreTouchStacks, the committed/reserved ratio for thread stacks should be
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// a lot lower, e.g.:
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// - Thread (reserved=10332400KB, committed=331828KB)
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// (thread #10021)
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// (stack: reserved=10301560KB, committed=300988KB) <<<
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output.shouldMatch("- *Thread.*reserved.*committed");
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output.reportDiagnosticSummary();
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Pattern pat = Pattern.compile(".*stack: reserved=(\\d+), committed=(\\d+).*");
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boolean foundLine = false;
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for (String line : output.asLines()) {
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Matcher m = pat.matcher(line);
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if (m.matches()) {
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reserved = Long.parseLong(m.group(1));
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committed = Long.parseLong(m.group(2));
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System.out.println(">>>>> " + line + ": " + reserved + " - " + committed);
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// Added sanity tests: we expect our test threads to be still alive when NMT prints its final
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// report, so their stacks should dominate the NMT-reported total stack size.
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long max_reserved = memoryCeilingMB * 3 * MB;
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long min_reserved = memoryCeilingMB * MB;
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if (reserved >= max_reserved || reserved < min_reserved) {
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throw new RuntimeException("Total reserved stack sizes outside of our expectations (" + reserved +
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", expected " + min_reserved + ".." + max_reserved + ")");
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}
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foundLine = true;
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break;
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}
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}
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if (!foundLine) {
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throw new RuntimeException("Did not find expected NMT output");
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}
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return committed;
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}
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public static void main(String[] args) throws Exception {
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if (args.length == 1 && args[0].equals("test")) {
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ArrayList<Thread> threads = new ArrayList<>();
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// Add a bunch of large-stacked threads to make a significant imprint on combined thread stack size
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for (int i = 0; i < numThreads; i++) {
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threads.add(createTestThread(i));
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}
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// Start test threads.
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threads.forEach(Thread::start);
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gate.await();
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// Stop VM. VM will run PrintNMTStatistics before exiting, and the still-running daemon threads
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// should show up with fully - or almost fully - committed thread stacks.
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} else {
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long pretouch_committed = runPreTouchTest(true);
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long no_pretouch_committed = runPreTouchTest(false);
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if (pretouch_committed == 0 || no_pretouch_committed == 0) {
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throw new RuntimeException("Could not run with PreTouch flag.");
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}
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long expected_delta = numThreads * (max_stack_usage_with_pretouch - min_stack_usage_with_pretouch);
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long actual_delta = pretouch_committed - no_pretouch_committed;
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if (pretouch_committed <= (no_pretouch_committed + expected_delta)) {
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throw new RuntimeException("Expected a higher amount of committed with pretouch stacks" +
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"PreTouch amount: " + pretouch_committed +
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"NoPreTouch amount: " + (no_pretouch_committed + expected_delta));
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}
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if (actual_delta < expected_delta) {
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throw new RuntimeException("Expected a higher delta between stack committed of with and without pretouch." +
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"Expected: " + expected_delta + " Actual: " + actual_delta);
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}
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}
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}
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}
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