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/*
* Copyright (c) 2016, 2023, 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.
*/
/*
* @test
* @bug 6515172 8148766
* @summary Check that availableProcessors reports the correct value when running in a cpuset on linux
* @requires os.family == "linux"
* @requires vm.flagless
* @modules java.base/jdk.internal.misc
* @library /test/lib
* @run driver AvailableProcessors
*/
import jdk.test.lib.process.ProcessTools;
import jdk.test.lib.process.OutputAnalyzer;
import jtreg.SkippedException;
import java.util.ArrayList;
import java.io.File;
public class AvailableProcessors {
static final String SUCCESS_STRING = "Found expected processors: ";
public static void main(String[] args) throws Exception {
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 {
throw new SkippedException("Could not find taskset command");
}
int available = Runtime.getRuntime().availableProcessors();
if (available == 1) {
throw new SkippedException("only one processor available");
}
// Get the java command we want to execute
// Enable logging for easier failure diagnosis
ProcessBuilder master =
ProcessTools.createLimitedTestJavaProcessBuilder("-Xlog:os=trace",
"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.shouldHaveExitValue(0);
output.shouldContain(SUCCESS_STRING);
}
}
}
static void checkProcessors(int expected) {
int available = Runtime.getRuntime().availableProcessors();
// available can dynamically drop below expected due to aggressive power management
// but we should never have more than expected, else taskset is broken
if (available <= 0 || available > expected)
throw new Error("Expected " + expected + " processors, but found "
+ available);
else
System.out.println(SUCCESS_STRING + available);
}
}
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