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annotate test/runtime/os/AvailableProcessors.java @ 24234:ea6f94ab283b default tip

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Added tag jvmci-0.36 for changeset 8128b98d4736
author Gilles Duboscq <gilles.m.duboscq@oracle.com>
date Mon, 18 Sep 2017 18:49:45 +0200
parents e21dd2c95cf0
children
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1 /*
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2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 import java.io.File;
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24 import com.oracle.java.testlibrary.ProcessTools;
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25 import com.oracle.java.testlibrary.OutputAnalyzer;
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26 import java.util.ArrayList;
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27
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28 /*
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29 * @test
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30 * @bug 6515172
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31 * @summary Check that availableProcessors reports the correct value when running in a cpuset on linux
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32 * @requires os.family == "linux"
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33 * @library /testlibrary
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34 * @build com.oracle.java.testlibrary.*
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35 * @run driver AvailableProcessors
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36 */
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37 public class AvailableProcessors {
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38
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39 static final String SUCCESS_STRING = "Found expected processors: ";
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40
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41 public static void main(String[] args) throws Throwable {
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42 if (args.length > 0)
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43 checkProcessors(Integer.parseInt(args[0]));
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44 else {
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45 // run ourselves under different cpu configurations
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46 // using the taskset command
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47 String taskset;
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48 final String taskset1 = "/bin/taskset";
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49 final String taskset2 = "/usr/bin/taskset";
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50 if (new File(taskset1).exists())
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51 taskset = taskset1;
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52 else if (new File(taskset2).exists())
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53 taskset = taskset2;
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54 else {
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55 System.out.println("Skipping test: could not find taskset command");
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56 return;
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57 }
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58
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59 int available = Runtime.getRuntime().availableProcessors();
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60
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61 if (available == 1) {
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62 System.out.println("Skipping test: only one processor available");
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63 return;
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64 }
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65
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66 // Get the java command we want to execute
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67 // Enable logging for easier failure diagnosis
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68 ProcessBuilder master =
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69 ProcessTools.createJavaProcessBuilder(false,
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70 "-XX:+UnlockDiagnosticVMOptions",
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71 "-XX:+PrintActiveCpus",
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72 "AvailableProcessors");
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73
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74 int[] expected = new int[] { 1, available/2, available-1, available };
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75
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76 for (int i : expected) {
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77 System.out.println("Testing for " + i + " processors ...");
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78 int max = i - 1;
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79 ArrayList<String> cmdline = new ArrayList<>(master.command());
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80 // prepend taskset command
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81 cmdline.add(0, "0-" + max);
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82 cmdline.add(0, "-c");
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83 cmdline.add(0, taskset);
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84 // append expected processor count
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85 cmdline.add(String.valueOf(i));
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86 ProcessBuilder pb = new ProcessBuilder(cmdline);
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87 System.out.println("Final command line: " +
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88 ProcessTools.getCommandLine(pb));
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89 OutputAnalyzer output = ProcessTools.executeProcess(pb);
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90 output.shouldContain(SUCCESS_STRING);
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91 }
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92 }
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93 }
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94
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95 static void checkProcessors(int expected) {
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96 int available = Runtime.getRuntime().availableProcessors();
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97 if (available != expected)
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98 throw new Error("Expected " + expected + " processors, but found "
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99 + available);
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100 else
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101 System.out.println(SUCCESS_STRING + available);
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102 }
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103 }