Gets the number of cores available in this device, across all processors. - Android Hardware

Android examples for Hardware:Device Feature

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Description

Gets the number of cores available in this device, across all processors.

Demo Code


//package com.java2s;
import java.io.*;
import java.util.regex.Pattern;

public class Main {
    private static int CPU_CORES = 0;

    /**//from   www  . ja v  a2s . com
     * Gets the number of cores available in this device, across all processors.
     * Requires: Ability to peruse the filesystem at "/sys/devices/system/cpu"
     *
     * @return The number of cores, or available processors if failed to get result
     */
    public static int getCoresNumbers() {
        if (CPU_CORES != 0) {
            return CPU_CORES;
        }
        //Private Class to display only CPU devices in the directory listing
        class CpuFilter implements FileFilter {
            @Override
            public boolean accept(File pathname) {
                //Check if filename is "cpu", followed by a single digit number
                if (Pattern.matches("cpu[0-9]+", pathname.getName())) {
                    return true;
                }
                return false;
            }
        }

        try {
            //Get directory containing CPU info
            File dir = new File("/sys/devices/system/cpu/");
            //Filter to only list the devices we care about
            File[] files = dir.listFiles(new CpuFilter());
            //Return the number of cores (virtual CPU devices)
            CPU_CORES = files.length;
        } catch (Exception e) {
            e.printStackTrace();
        }
        if (CPU_CORES < 1) {
            CPU_CORES = Runtime.getRuntime().availableProcessors();
        }
        if (CPU_CORES < 1) {
            CPU_CORES = 1;
        }
        return CPU_CORES;
    }
}

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