1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/test/runtime/os/AvailableProcessors.java Thu Sep 22 02:04:40 2016 -0700
1.3 @@ -0,0 +1,103 @@
1.4 +/*
1.5 + * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + */
1.26 +import java.io.File;
1.27 +import com.oracle.java.testlibrary.ProcessTools;
1.28 +import com.oracle.java.testlibrary.OutputAnalyzer;
1.29 +import java.util.ArrayList;
1.30 +
1.31 +/*
1.32 + * @test
1.33 + * @bug 6515172
1.34 + * @summary Check that availableProcessors reports the correct value when running in a cpuset on linux
1.35 + * @requires os.family == "linux"
1.36 + * @library /testlibrary
1.37 + * @build com.oracle.java.testlibrary.*
1.38 + * @run driver AvailableProcessors
1.39 + */
1.40 +public class AvailableProcessors {
1.41 +
1.42 + static final String SUCCESS_STRING = "Found expected processors: ";
1.43 +
1.44 + public static void main(String[] args) throws Throwable {
1.45 + if (args.length > 0)
1.46 + checkProcessors(Integer.parseInt(args[0]));
1.47 + else {
1.48 + // run ourselves under different cpu configurations
1.49 + // using the taskset command
1.50 + String taskset;
1.51 + final String taskset1 = "/bin/taskset";
1.52 + final String taskset2 = "/usr/bin/taskset";
1.53 + if (new File(taskset1).exists())
1.54 + taskset = taskset1;
1.55 + else if (new File(taskset2).exists())
1.56 + taskset = taskset2;
1.57 + else {
1.58 + System.out.println("Skipping test: could not find taskset command");
1.59 + return;
1.60 + }
1.61 +
1.62 + int available = Runtime.getRuntime().availableProcessors();
1.63 +
1.64 + if (available == 1) {
1.65 + System.out.println("Skipping test: only one processor available");
1.66 + return;
1.67 + }
1.68 +
1.69 + // Get the java command we want to execute
1.70 + // Enable logging for easier failure diagnosis
1.71 + ProcessBuilder master =
1.72 + ProcessTools.createJavaProcessBuilder(false,
1.73 + "-XX:+UnlockDiagnosticVMOptions",
1.74 + "-XX:+PrintActiveCpus",
1.75 + "AvailableProcessors");
1.76 +
1.77 + int[] expected = new int[] { 1, available/2, available-1, available };
1.78 +
1.79 + for (int i : expected) {
1.80 + System.out.println("Testing for " + i + " processors ...");
1.81 + int max = i - 1;
1.82 + ArrayList<String> cmdline = new ArrayList<>(master.command());
1.83 + // prepend taskset command
1.84 + cmdline.add(0, "0-" + max);
1.85 + cmdline.add(0, "-c");
1.86 + cmdline.add(0, taskset);
1.87 + // append expected processor count
1.88 + cmdline.add(String.valueOf(i));
1.89 + ProcessBuilder pb = new ProcessBuilder(cmdline);
1.90 + System.out.println("Final command line: " +
1.91 + ProcessTools.getCommandLine(pb));
1.92 + OutputAnalyzer output = ProcessTools.executeProcess(pb);
1.93 + output.shouldContain(SUCCESS_STRING);
1.94 + }
1.95 + }
1.96 + }
1.97 +
1.98 + static void checkProcessors(int expected) {
1.99 + int available = Runtime.getRuntime().availableProcessors();
1.100 + if (available != expected)
1.101 + throw new Error("Expected " + expected + " processors, but found "
1.102 + + available);
1.103 + else
1.104 + System.out.println(SUCCESS_STRING + available);
1.105 + }
1.106 +}
