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/*
* Copyright (c) 2007 Sun Microsystems, Inc. All rights reserved.
*
* Sun Microsystems, Inc. has intellectual property rights relating to technology embodied in the product
* that is described in this document. In particular, and without limitation, these intellectual property
* rights may include one or more of the U.S. patents listed at http://www.sun.com/patents and one or
* more additional patents or pending patent applications in the U.S. and in other countries.
*
* U.S. Government Rights - Commercial software. Government users are subject to the Sun
* Microsystems, Inc. standard license agreement and applicable provisions of the FAR and its
* supplements.
*
* Use is subject to license terms. Sun, Sun Microsystems, the Sun logo, Java and Solaris are trademarks or
* registered trademarks of Sun Microsystems, Inc. in the U.S. and other countries. All SPARC trademarks
* are used under license and are trademarks or registered trademarks of SPARC International, Inc. in the
* U.S. and other countries.
*
* UNIX is a registered trademark in the U.S. and other countries, exclusively licensed through X/Open
* Company, Ltd.
*/
package com.sun.max.util;
import java.io.*;
import java.util.regex.*;
/**
* Class for run-time system information.
*
* @author Paul Caprioli
*/
public final class RuntimeInfo {
/**
* Gets the suggested maximum number of processes to fork.
* @param requestedMemorySize the physical memory size (in bytes) that each process will consume.
* @return the suggested number of processes that should be started in parallel.
*/
public static int getSuggestedMaximumProcesses(long requestedMemorySize) {
final Runtime runtime = Runtime.getRuntime();
final String os = System.getProperty("os.name");
long freeMemory = 0L;
try {
if (os.equals("Linux")) {
final Process process = runtime.exec(new String[] {"/usr/bin/free", "-ob"});
final BufferedReader in = new BufferedReader(new InputStreamReader(process.getInputStream()));
in.readLine();
final String line = in.readLine();
final String[] fields = line.split("\\s+");
freeMemory = Long.parseLong(fields[3]);
} else if (os.equals("SunOS")) {
Process process = runtime.exec(new String[] {"/bin/kstat", "-p", "-nsystem_pages", "-sfreemem"});
BufferedReader in = new BufferedReader(new InputStreamReader(process.getInputStream()));
String line = in.readLine();
String[] fields = line.split("\\s+");
freeMemory = Long.parseLong(fields[1]);
process = runtime.exec(new String[] {"/bin/getconf", "PAGESIZE"});
in = new BufferedReader(new InputStreamReader(process.getInputStream()));
line = in.readLine();
freeMemory *= Long.parseLong(line);
} else if (os.equals("Mac OS X") || os.equals("Darwin")) {
final Process process = runtime.exec("/usr/bin/vm_stat");
final BufferedReader in = new BufferedReader(new InputStreamReader(process.getInputStream()));
final Matcher matcher = Pattern.compile("[^0-9]*([0-9]+)[^0-9]*").matcher(in.readLine());
if (matcher.matches()) {
freeMemory = Long.parseLong(matcher.group(1));
}
matcher.reset(in.readLine());
if (matcher.matches()) {
freeMemory *= Long.parseLong(matcher.group(1));
}
} else if (os.equals("GuestVM")) {
freeMemory = 0L;
}
} catch (Exception e) {
freeMemory = 0L;
}
final int processors = runtime.availableProcessors();
if (freeMemory <= 0L || freeMemory >= requestedMemorySize * processors) {
return processors;
}
return Math.max(1, (int) (freeMemory / requestedMemorySize));
}
private RuntimeInfo() {
}
}