Android Device Information Get getDeviceCpuCores()

Description

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

License

Apache License

Return

The number of cores, or the value of * Runtime.getRuntime().availableProcessors() if failed to get result

Declaration

private static int getDeviceCpuCores() 

Method Source Code

//package com.java2s;
/*/*from   www .j  av  a  2s. com*/
 * Copyright 2013 Luluvise Ltd
 * Copyright 2013 Marco Salis - fast3r(at)gmail.com
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.io.File;
import java.io.FileFilter;

import java.util.regex.Pattern;

public class Main {
    /**
     * Gets the number of cores available in this device, across all processors.
     * Requires: Ability to access the filesystem at "/sys/devices/system/cpu"
     * 
     * @return The number of cores, or the value of {@link
     *         Runtime.getRuntime().availableProcessors()} if failed to get
     *         result
     */
    private static int getDeviceCpuCores() {
        // 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
                return Pattern.matches("cpu[0-9]", pathname.getName());
            }
        }
        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)
            final int cpuCount = files.length;
            if (cpuCount > 0) {
                return cpuCount;
            }
        } catch (Exception e) {
            // falls back to Runtime.getRuntime().availableProcessors()
        }
        return Runtime.getRuntime().availableProcessors();
    }
}

Related

1. getDeviceType(Context ctx)
2. getDeviceModel()
3. getDeviceCpuCores()
4. getDeviceUniqueIdentificator( @Nonnull Context context, @Nonnull String appId)
5. deviceBeRoot()
6. get_device_id(Context ctx)