怎样用java实现CPU的调度?要用到什么类?

cpu调度及内存分配算法

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写的一个操作系统的实验，篇幅原因，只给了内存分配和回收代码．

/**

单 位：中南大学软件学院0501班

文 件：CpuScheduler.java

项 目：操作系统cpu调度算法模拟程序

作 者：刘欣

创建时间：2007年5月14日

**/

public static void InitMem(){

MemTable = new memory();

MemTable.Setmem_beg(0);

MemTable.Setmem_size(100);

MemTable.Setmem_state(0);

}

public boolean InitMemory(Pcb temp){

memory mem_temp,last,now;

last = MemTable;

mem_temp = new memory(temp.GetName(),temp.Getmem_size());

boolean flag = true;

if(mem_temp.Getmem_size() 100 ){

c.tcpuinfo.setText(mem_temp.GetPcd_name()+"is too big");

flag = false;

}

if(MemTable == null){

return flag;

}

if(mem_temp.Getmem_size() + nowsize 100){

c.tcpuinfo.setText("memory has been full please wait");

flag = false;

}

if(MemTable.Getmem_state() == 0){// if the first is empty;

if(MemTable.Getmem_size() mem_temp.Getmem_size()){

mem_temp.next = MemTable;

mem_temp.Setmem_beg( last.Getmem_beg() );

mem_temp.Setmem_state(1);

MemTable.Setmem_beg(mem_temp.Getmem_beg() + mem_temp.Getmem_size());

MemTable.Setmem_size( MemTable.Getmem_size()-mem_temp.Getmem_size() );

MemTable = mem_temp;

nowsize += mem_temp.Getmem_size();

return flag;

}

if (MemTable.Getmem_size() == mem_temp.Getmem_size()){

// MemTable.SetPcd_name(mem_temp.GetPcd_name());

mem_temp = MemTable;

mem_temp.Setmem_state(1);

mem_temp.next = MemTable;

nowsize += mem_temp.Getmem_size();

return flag;

}

}

// begin obtain the other;

if(last != null){

now = last.next;

while(now != null){// search the teble for sutible memory;

if(now.Getmem_state() == 0){// if the first is empty;

if(now.Getmem_size() mem_temp.Getmem_size()){

mem_temp.next = now;

mem_temp.Setmem_beg( now.Getmem_beg() );

mem_temp.Setmem_state(1);

now.Setmem_beg(mem_temp.Getmem_beg() + mem_temp.Getmem_size());

now.Setmem_size( now.Getmem_size()-mem_temp.Getmem_size() );

last.next = mem_temp;

nowsize += mem_temp.Getmem_size();

return flag;

}

else if (now.Getmem_size() == mem_temp.Getmem_size()){

now.SetPcd_name(mem_temp.GetPcd_name());

mem_temp = now;

mem_temp.Setmem_state(1);

last.next = mem_temp;

nowsize += mem_temp.Getmem_size();

return flag;

}

}

last = now;

//if(last != null){

now = now.next;

//}

}

}

return flag;

}

public void ReleaseMem(Pcb Temp){

memory mem_temp,last,now;

mem_temp = new memory(Temp.GetName(),Temp.Getmem_size());

if(MemTable == null){

c.tcpuinfo.setText("无内存可释放");

//return false;

}

last = MemTable;

now = last.next;

if (MemTable.GetPcd_name() == mem_temp.GetPcd_name()){//如果第一个就是要释放的分区;

MemTable.Setmem_state(0);

MemTable.SetPcd_name(null);

if(now != null now.Getmem_state() == 0 ){//如果后邻接分区也是空闲的;

MemTable.Setmem_size(MemTable.Getmem_size() + now.Getmem_size());

MemTable.SetPcd_name(null);

nowsize -= mem_temp.Getmem_size();

MemTable.next = null;

// return true;

}

}

while (now != null){//在链表中寻找要释放的分区;

if(now.GetPcd_name() == mem_temp.GetPcd_name()){//找到;

nowsize -= mem_temp.Getmem_size();

now.Setmem_state(0);

if(now.next != null now.next.Getmem_state() == 0){//查看后面相邻结点是否有空闲;

last.next = now.next;

now.next.Setmem_beg(now.Getmem_beg());

now.next.Setmem_size(now.Getmem_size() + now.next.Getmem_size());

now = last.next;

now.SetPcd_name(null);

}

if(last.Getmem_state() == 0){//查看前面相邻结点是否有空闲;

last.next = now.next;

last.Setmem_size(last.Getmem_size() + now.Getmem_size());

last.SetPcd_name(null);

now = last.next;

// now.SetPcd_name(null);

}

}

last = now;

now = now.next;

}

}

Java如何读取CPU的数据信息

java获取所有系统信息（CPU、内存、进程等）的代码：

import java.io.InputStreamReader;

import java.io.LineNumberReader;

import java.util.ArrayList;

import java.util.List;

import mytools.com.sun.management.OperatingSystemMXBean;

import mytools.java.io.File;

import mytools.java.lang.management.ManagementFactory;

/**

* 获取windows系统信息（CPU,内存,文件系统）

* @author libing

*

*/

public class WindowsInfoUtil {

private static final int CPUTIME = 500;

private static final int PERCENT = 100;

private static final int FAULTLENGTH = 10;

public static void main(String[] args) {

System.out.println(getCpuRatioForWindows());

System.out.println(getMemery());

System.out.println(getDisk());

}

//获取内存使用率

public static String getMemery(){

OperatingSystemMXBean osmxb = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();

// 总的物理内存+虚拟内存

long totalvirtualMemory = osmxb.getTotalSwapSpaceSize();

// 剩余的物理内存

long freePhysicalMemorySize = osmxb.getFreePhysicalMemorySize();

Double compare=(Double)(1-freePhysicalMemorySize*1.0/totalvirtualMemory)*100;

String str="内存已使用:"+compare.intValue()+"%";

return str;

}

//获取文件系统使用率

public static ListString getDisk() {

// 操作系统

ListString list=new ArrayListString();

for (char c = 'A'; c = 'Z'; c++) {

String dirName = c + ":/";

File win = new File(dirName);

if(win.exists()){

long total=(long)win.getTotalSpace();

long free=(long)win.getFreeSpace();

Double compare=(Double)(1-free*1.0/total)*100;

String str=c+":盘 已使用 "+compare.intValue()+"%";

list.add(str);

}

}

return list;

}

//获得cpu使用率

public static String getCpuRatioForWindows() {

try {

String procCmd = System.getenv("windir") + "\\system32\\wbem\\wmic.exe process get Caption,CommandLine,KernelModeTime,ReadOperationCount,ThreadCount,UserModeTime,WriteOperationCount";

// 取进程信息

long[] c0 = readCpu(Runtime.getRuntime().exec(procCmd));

Thread.sleep(CPUTIME);

long[] c1 = readCpu(Runtime.getRuntime().exec(procCmd));

if (c0 != null c1 != null) {

long idletime = c1[0] - c0[0];

long busytime = c1[1] - c0[1];

return "CPU使用率:"+Double.valueOf(PERCENT * (busytime)*1.0 / (busytime + idletime)).intValue()+"%";

} else {

return "CPU使用率:"+0+"%";

}

} catch (Exception ex) {

ex.printStackTrace();

return "CPU使用率:"+0+"%";

}

}

//读取cpu相关信息

private static long[] readCpu(final Process proc) {

long[] retn = new long[2];

try {

proc.getOutputStream().close();

InputStreamReader ir = new InputStreamReader(proc.getInputStream());

LineNumberReader input = new LineNumberReader(ir);

String line = input.readLine();

if (line == null || line.length() FAULTLENGTH) {

return null;

}

int capidx = line.indexOf("Caption");

int cmdidx = line.indexOf("CommandLine");

int rocidx = line.indexOf("ReadOperationCount");

int umtidx = line.indexOf("UserModeTime");

int kmtidx = line.indexOf("KernelModeTime");

int wocidx = line.indexOf("WriteOperationCount");

long idletime = 0;

long kneltime = 0;

long usertime = 0;

while ((line = input.readLine()) != null) {

if (line.length() wocidx) {

continue;

}

// 字段出现顺序：Caption,CommandLine,KernelModeTime,ReadOperationCount,

// ThreadCount,UserModeTime,WriteOperation

String caption =substring(line, capidx, cmdidx - 1).trim();

String cmd = substring(line, cmdidx, kmtidx - 1).trim();

if (cmd.indexOf("wmic.exe") = 0) {

continue;

}

String s1 = substring(line, kmtidx, rocidx - 1).trim();

String s2 = substring(line, umtidx, wocidx - 1).trim();

if (caption.equals("System Idle Process") || caption.equals("System")) {

if (s1.length() 0)

idletime += Long.valueOf(s1).longValue();

if (s2.length() 0)

idletime += Long.valueOf(s2).longValue();

continue;

}

if (s1.length() 0)

kneltime += Long.valueOf(s1).longValue();

if (s2.length() 0)

usertime += Long.valueOf(s2).longValue();

}

retn[0] = idletime;

retn[1] = kneltime + usertime;

return retn;

} catch (Exception ex) {

ex.printStackTrace();

} finally {

try {

proc.getInputStream().close();

} catch (Exception e) {

e.printStackTrace();

}

}

return null;

}

/**

* 由于String.subString对汉字处理存在问题（把一个汉字视为一个字节)，因此在 包含汉字的字符串时存在隐患，现调整如下：

* @param src 要截取的字符串

* @param start_idx 开始坐标（包括该坐标)

* @param end_idx 截止坐标（包括该坐标）

* @return

*/

private static String substring(String src, int start_idx, int end_idx) {

byte[] b = src.getBytes();

String tgt = "";

for (int i = start_idx; i = end_idx; i++) {

tgt += (char) b[i];

}

return tgt;

}

}

java获取cpu温度,跪求源代码。。。

研究了一下

cpu温度的数值由主板驱动供给windows，目前的现状是许多PC兼容机不提供或没安装“专用的主板驱动”(比如大量的ghost集成装机)，连win都没法获知温度，更别提win之上的Java。

在专用主板驱动安装正常的win-java系统下可以：

import java.util.Scanner;

public class Test {

static public void main(String 土数[]) {

try {

final String cmd="wmic /namespace:\\\\root\\WMI path MSAcpi_ThermalZoneTemperature get CurrentTemperature";

Process p = Runtime.getRuntime().exec(cmd);

p.getOutputStream().close();//这句不写就不执行

Scanner sc=new Scanner(p.getInputStream());

sc.next();

float t=(sc.nextInt()-2732f)/10f;

sc.close();

System.out.println("当前CPU温度:"+t);

p.waitFor();

} catch (Exception e) {

e.printStackTrace();

}

}

}

==

当前CPU温度:41.0

linux下同样依赖“主板驱动”, 数据提供给/dev/sensor

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