在Java中查找内核数

小开

最佳答案

int cores = Runtime.getRuntime().availableProcessors();

如果cores小于1，要么你的处理器要死了，要么你的JVM有严重的bug，要么宇宙就要爆炸了。

小开

这适用于安装了Cygwin的Windows:

System.getenv("NUMBER_OF_PROCESSORS")

小开

如果你想获得物理核的数量，你可以运行cmd和terminal命令，然后解析输出，以获得你需要的信息。下面是返回物理核数的函数。

private int getNumberOfCPUCores() {
OSValidator osValidator = new OSValidator();
String command = "";
if(osValidator.isMac()){
command = "sysctl -n machdep.cpu.core_count";
}else if(osValidator.isUnix()){
command = "lscpu";
}else if(osValidator.isWindows()){
command = "cmd /C WMIC CPU Get /Format:List";
}
Process process = null;
int numberOfCores = 0;
int sockets = 0;
try {
if(osValidator.isMac()){
String[] cmd = { "/bin/sh", "-c", command};
process = Runtime.getRuntime().exec(cmd);
}else{
process = Runtime.getRuntime().exec(command);
}
} catch (IOException e) {
e.printStackTrace();
}


BufferedReader reader = new BufferedReader(
new InputStreamReader(process.getInputStream()));
String line;


try {
while ((line = reader.readLine()) != null) {
if(osValidator.isMac()){
numberOfCores = line.length() > 0 ? Integer.parseInt(line) : 0;
}else if (osValidator.isUnix()) {
if (line.contains("Core(s) per socket:")) {
numberOfCores = Integer.parseInt(line.split("\\s+")[line.split("\\s+").length - 1]);
}
if(line.contains("Socket(s):")){
sockets = Integer.parseInt(line.split("\\s+")[line.split("\\s+").length - 1]);
}
} else if (osValidator.isWindows()) {
if (line.contains("NumberOfCores")) {
numberOfCores = Integer.parseInt(line.split("=")[1]);
}
}
}
} catch (IOException e) {
e.printStackTrace();
}
if(osValidator.isUnix()){
return numberOfCores * sockets;
}
return numberOfCores;
}

OSValidator类:

public class OSValidator {


private static String OS = System.getProperty("os.name").toLowerCase();


public static void main(String[] args) {


System.out.println(OS);


if (isWindows()) {
System.out.println("This is Windows");
} else if (isMac()) {
System.out.println("This is Mac");
} else if (isUnix()) {
System.out.println("This is Unix or Linux");
} else if (isSolaris()) {
System.out.println("This is Solaris");
} else {
System.out.println("Your OS is not support!!");
}
}


public static boolean isWindows() {
return (OS.indexOf("win") >= 0);
}


public static boolean isMac() {
return (OS.indexOf("mac") >= 0);
}


public static boolean isUnix() {
return (OS.indexOf("nix") >= 0 || OS.indexOf("nux") >= 0 || OS.indexOf("aix") > 0 );
}


public static boolean isSolaris() {
return (OS.indexOf("sunos") >= 0);
}
public static String getOS(){
if (isWindows()) {
return "win";
} else if (isMac()) {
return "osx";
} else if (isUnix()) {
return "uni";
} else if (isSolaris()) {
return "sol";
} else {
return "err";
}
}

｝

小开

这是一种额外的方法来找出CPU核数(以及许多其他信息)，但这段代码需要一个额外的依赖:

本机操作系统和硬件信息 https://github.com/oshi/oshi < / p >

SystemInfo systemInfo = new SystemInfo();
HardwareAbstractionLayer hardwareAbstractionLayer = systemInfo.getHardware();
CentralProcessor centralProcessor = hardwareAbstractionLayer.getProcessor();

获取可用于处理的逻辑cpu数量:

centralProcessor.getLogicalProcessorCount();

小开

如果你想要检查你机器上的核数和你的java程序给你的核数。

Linux终端:lscpu

在Windows终端(cmd)中:echo %NUMBER_OF_PROCESSORS%

Mac终端:sysctl -n hw.ncpu