142 lines
4.5 KiB
Java
142 lines
4.5 KiB
Java
/*
|
|
* Copyright (c) 2017, 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.BufferedReader;
|
|
import java.io.File;
|
|
import java.io.IOException;
|
|
import java.nio.file.Files;
|
|
import java.nio.file.Paths;
|
|
import java.io.FileReader;
|
|
import java.util.ArrayList;
|
|
import java.util.Optional;
|
|
import java.util.List;
|
|
import java.util.stream.Collectors;
|
|
import java.util.stream.Stream;
|
|
import jdk.test.lib.Asserts;
|
|
|
|
|
|
// A simple CPU sets reader and parser
|
|
public class CPUSetsReader {
|
|
public static String PROC_SELF_STATUS_PATH="/proc/self/status";
|
|
|
|
// Test the parser
|
|
public static void test() {
|
|
assertParse("0-7", "0,1,2,3,4,5,6,7");
|
|
assertParse("1,3,6", "1,3,6");
|
|
assertParse("0,2-4,6,10-11", "0,2,3,4,6,10,11");
|
|
assertParse("0", "0");
|
|
}
|
|
|
|
|
|
private static void assertParse(String cpuSet, String expectedResult) {
|
|
Asserts.assertEquals(listToString(parseCpuSet(cpuSet)), expectedResult);
|
|
}
|
|
|
|
|
|
public static String readFromProcStatus(String setType) {
|
|
String path = PROC_SELF_STATUS_PATH;
|
|
Optional<String> o = Optional.empty();
|
|
|
|
System.out.println("readFromProcStatus() entering for: " + setType);
|
|
|
|
try (Stream<String> stream = Files.lines(Paths.get(path))) {
|
|
o = stream
|
|
.filter(line -> line.contains(setType))
|
|
.findFirst();
|
|
} catch (IOException e) {
|
|
return null;
|
|
}
|
|
|
|
if (!o.isPresent()) {
|
|
return null; // entry not found
|
|
}
|
|
|
|
String[] parts = o.get().replaceAll("\\s","").split(":");
|
|
|
|
// Should be 2 parts, before and after ":"
|
|
Asserts.assertEquals(parts.length, 2);
|
|
|
|
String result = parts[1];
|
|
System.out.println("readFromProcStatus() returning: " + result);
|
|
return result;
|
|
}
|
|
|
|
|
|
public static List<Integer> parseCpuSet(String value) {
|
|
ArrayList<Integer> result = new ArrayList<Integer>();
|
|
|
|
try {
|
|
String[] commaSeparated = value.split(",");
|
|
|
|
for (String item : commaSeparated) {
|
|
if (item.contains("-")) {
|
|
addRange(result, item);
|
|
} else {
|
|
result.add(Integer.parseInt(item));
|
|
}
|
|
}
|
|
} catch (Exception e) {
|
|
System.err.println("Exception in getMaxCpuSets(): " + e);
|
|
return null;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
private static void addRange(ArrayList<Integer> list, String s) {
|
|
String[] range = s.split("-");
|
|
if ( range.length != 2 ) {
|
|
throw new RuntimeException("Range should only contain two items, but contains "
|
|
+ range.length + " items");
|
|
}
|
|
|
|
int min = Integer.parseInt(range[0]);
|
|
int max = Integer.parseInt(range[1]);
|
|
|
|
if (min >= max) {
|
|
String msg = String.format("min is greater or equals to max, min = %d, max = %d",
|
|
min, max);
|
|
throw new RuntimeException(msg);
|
|
}
|
|
|
|
for (int i = min; i <= max; i++) {
|
|
list.add(i);
|
|
}
|
|
}
|
|
|
|
|
|
// Convert list of integers to string with comma-separated values
|
|
public static String listToString(List<Integer> list) {
|
|
return listToString(list, Integer.MAX_VALUE);
|
|
}
|
|
|
|
// Convert list of integers to a string with comma-separated values;
|
|
// include up to maxCount.
|
|
public static String listToString(List<Integer> list, int maxCount) {
|
|
return list.stream()
|
|
.limit(maxCount)
|
|
.map(Object::toString)
|
|
.collect(Collectors.joining(","));
|
|
}
|
|
}
|