126 lines
4.7 KiB
Java
126 lines
4.7 KiB
Java
/*
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* Copyright (c) 2022 SAP SE. All rights reserved.
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* Copyright (c) 2022, 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.regex.Matcher;
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import java.util.regex.Pattern;
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/*
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* @test
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* @summary Test AlwaysPreTouchThreadStacks
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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
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*/
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public class TestAlwaysPreTouchStacks extends Thread {
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static private final Thread createTestThread(int stackSize) {
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Thread t = new Thread(null,
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() -> System.out.println("Alive: " + stackSize),
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"Thread-" + stackSize, stackSize);
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return t;
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}
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public static void main(String[] args) throws InterruptedException, IOException {
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int[] stackSizes = {
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1024 * 256, 1024 * 512, 1024 * 1024 * 3
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};
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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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for (int s: stackSizes) {
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threads.add(createTestThread(s));
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}
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threads.forEach(Thread::start);
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for (Thread t: threads) {
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t.join();
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}
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} else {
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ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
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"-XX:+UnlockDiagnosticVMOptions",
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"-Xmx100M",
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"-XX:+AlwaysPreTouchStacks", "-Xlog:os+thread=trace",
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"-XX:NativeMemoryTracking=summary", "-XX:+PrintNMTStatistics",
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"TestAlwaysPreTouchStacks",
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"test");
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OutputAnalyzer output = new OutputAnalyzer(pb.start());
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output.reportDiagnosticSummary();
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output.shouldHaveExitValue(0);
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for (int s: stackSizes) {
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output.shouldContain("Alive: " + Integer.toString(s));
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}
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output.shouldContain("Pretouching thread stack");
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// We want to see, in the final NMT printout, a committed thread stack size very close to reserved
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// 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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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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long reserved = Long.parseLong(m.group(1));
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long committed = Long.parseLong(m.group(2));
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System.out.println(">>>>> " + line + ": " + reserved + " - " + committed);
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if (committed < (reserved / 2)) {
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throw new RuntimeException("Expected a higher ratio between stack committed and 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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}
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}
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}
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