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annotate graal/com.oracle.max.base/src/com/sun/max/util/RuntimeInfo.java @ 4231:d713eaf4d288

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Renaming
author Christian Wimmer <Christian.Wimmer@Oracle.com>
date Thu, 05 Jan 2012 16:09:47 -0800
parents e233f5660da4
children
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1 /*
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2 * Copyright (c) 2009, 2011, 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 package com.sun.max.util;
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24
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25 import java.io.*;
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26 import java.util.regex.*;
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27
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28 /**
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29 * Class for run-time system information.
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30 */
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31 public final class RuntimeInfo {
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32
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33 /**
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34 * Gets the suggested maximum number of processes to fork.
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35 * @param requestedMemorySize the physical memory size (in bytes) that each process will consume.
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36 * @return the suggested number of processes that should be started in parallel.
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37 */
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38 public static int getSuggestedMaximumProcesses(long requestedMemorySize) {
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39 final Runtime runtime = Runtime.getRuntime();
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40 final String os = System.getProperty("os.name");
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41 long freeMemory = 0L;
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42 try {
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43 if (os.equals("Linux")) {
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44 final Process process = runtime.exec(new String[] {"/usr/bin/free", "-ob"});
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45 final BufferedReader in = new BufferedReader(new InputStreamReader(process.getInputStream()));
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46 in.readLine();
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47 final String line = in.readLine();
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48 final String[] fields = line.split("\\s+");
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49 freeMemory = Long.parseLong(fields[3]);
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50 } else if (os.equals("SunOS")) {
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51 Process process = runtime.exec(new String[] {"/bin/kstat", "-p", "-nsystem_pages", "-sfreemem"});
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52 BufferedReader in = new BufferedReader(new InputStreamReader(process.getInputStream()));
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53 String line = in.readLine();
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54 String[] fields = line.split("\\s+");
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55 freeMemory = Long.parseLong(fields[1]);
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56 process = runtime.exec(new String[] {"/bin/getconf", "PAGESIZE"});
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57 in = new BufferedReader(new InputStreamReader(process.getInputStream()));
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58 line = in.readLine();
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59 freeMemory *= Long.parseLong(line);
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60 } else if (os.equals("Mac OS X") || os.equals("Darwin")) {
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61 final Process process = runtime.exec("/usr/bin/vm_stat");
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62 final BufferedReader in = new BufferedReader(new InputStreamReader(process.getInputStream()));
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63 final Matcher matcher = Pattern.compile("[^0-9]*([0-9]+)[^0-9]*").matcher(in.readLine());
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64 if (matcher.matches()) {
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65 freeMemory = Long.parseLong(matcher.group(1));
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66 }
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67 matcher.reset(in.readLine());
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68 if (matcher.matches()) {
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69 freeMemory *= Long.parseLong(matcher.group(1));
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70 }
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71 } else if (os.equals("MaxVE")) {
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72 freeMemory = 0L;
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73 }
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74 } catch (Exception e) {
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75 freeMemory = 0L;
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76 }
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77 final int processors = runtime.availableProcessors();
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78 if (freeMemory <= 0L || freeMemory >= requestedMemorySize * processors) {
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79 return processors;
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80 }
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81 return Math.max(1, (int) (freeMemory / requestedMemorySize));
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82 }
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83
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84 private RuntimeInfo() {
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85 }
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86 }