| /* |
| * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| import java.io.File; |
| import com.oracle.java.testlibrary.ProcessTools; |
| import com.oracle.java.testlibrary.OutputAnalyzer; |
| import java.util.ArrayList; |
| |
| /* |
| * @test |
| * @bug 6515172 |
| * @summary Check that availableProcessors reports the correct value when running in a cpuset on linux |
| * @requires os.family == "linux" |
| * @library /testlibrary |
| * @build com.oracle.java.testlibrary.* |
| * @run driver AvailableProcessors |
| */ |
| public class AvailableProcessors { |
| |
| static final String SUCCESS_STRING = "Found expected processors: "; |
| |
| public static void main(String[] args) throws Throwable { |
| if (args.length > 0) |
| checkProcessors(Integer.parseInt(args[0])); |
| else { |
| // run ourselves under different cpu configurations |
| // using the taskset command |
| String taskset; |
| final String taskset1 = "/bin/taskset"; |
| final String taskset2 = "/usr/bin/taskset"; |
| if (new File(taskset1).exists()) |
| taskset = taskset1; |
| else if (new File(taskset2).exists()) |
| taskset = taskset2; |
| else { |
| System.out.println("Skipping test: could not find taskset command"); |
| return; |
| } |
| |
| int available = Runtime.getRuntime().availableProcessors(); |
| |
| if (available == 1) { |
| System.out.println("Skipping test: only one processor available"); |
| return; |
| } |
| |
| // Get the java command we want to execute |
| // Enable logging for easier failure diagnosis |
| ProcessBuilder master = |
| ProcessTools.createJavaProcessBuilder(false, |
| "-XX:+UnlockDiagnosticVMOptions", |
| "-XX:+PrintActiveCpus", |
| "AvailableProcessors"); |
| |
| int[] expected = new int[] { 1, available/2, available-1, available }; |
| |
| for (int i : expected) { |
| System.out.println("Testing for " + i + " processors ..."); |
| int max = i - 1; |
| ArrayList<String> cmdline = new ArrayList<>(master.command()); |
| // prepend taskset command |
| cmdline.add(0, "0-" + max); |
| cmdline.add(0, "-c"); |
| cmdline.add(0, taskset); |
| // append expected processor count |
| cmdline.add(String.valueOf(i)); |
| ProcessBuilder pb = new ProcessBuilder(cmdline); |
| System.out.println("Final command line: " + |
| ProcessTools.getCommandLine(pb)); |
| OutputAnalyzer output = ProcessTools.executeProcess(pb); |
| output.shouldContain(SUCCESS_STRING); |
| } |
| } |
| } |
| |
| static void checkProcessors(int expected) { |
| int available = Runtime.getRuntime().availableProcessors(); |
| if (available != expected) |
| throw new Error("Expected " + expected + " processors, but found " |
| + available); |
| else |
| System.out.println(SUCCESS_STRING + available); |
| } |
| } |