Getting human readable info about CPU

Question

I am trying to get info about smartphone's CPU. I can get that from displaying /proc/cpuinfo file. However its output is poor and unreadable. I would like to have output like from "lscpu" command but when I execute command "lscpu" from my app I have no permissions to do that (however I can do that from Termux console on my phone and output is readable). Do you have any ideas how to get human readable?

Here is code to view /proc/cpuinfo file:

static class CMDExecute {
    synchronized String run(String[] cmd)
            throws IOException {
        String result = "";

        try {
            ProcessBuilder builder = new ProcessBuilder(cmd);
            builder.redirectErrorStream(true);
            Process process = builder.start();
            InputStream in = process.getInputStream();
            byte[] re = new byte[1024];
            while (in.read(re) != -1) {
                System.out.println(new String(re));
                result = result + new String(re);
            }
            in.close();

        } catch (Exception ex) {
            ex.printStackTrace();
        }
        return result;
    }
}

private static StringBuffer buffer;

public static void fetch_cpu_info() {
    String result = null;
    CMDExecute cmdexe = new CMDExecute();
    try {
        String[] args = {"/system/bin/cat", "/proc/cpuinfo"};
        result = cmdexe.run(args);
        System.out.println("RESULT\n" + result);
    } catch (IOException ex) {
        ex.printStackTrace();
    }
}

and its output:

I/System.out: RESULT

processor   : 0
Features    : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt lpae evtstrm aes pmull sha1 sha2 crc32
CPU implementer : 0x41
CPU architecture: 8
CPU variant : 0x0
CPU part    : 0xd03
CPU revision    : 4
processor   : 1
Features    : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt lpae evtstrm aes pmull sha1 sha2 crc32
CPU implementer : 0x41
CPU architecture: 8
CPU variant : 0x0
CPU part    : 0xd03
CPU revision    : 4
processor   : 2
Features    : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt lpae evtstrm aes pmull sha1 sha2 crc32
CPU implementer : 0x41
CPU architecture: 8
CPU variant : 0x0
CPU part    : 0xd03
CPU revision    : 4
processor   : 3
Features    : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt lpae evtstrm aes pmull sha1 sha2 crc32
CPU implementer : 0x41
CPU architecture: 8
CPU variant : 0x0
CPU part    : 0xd03
CPU revision    : 4

As you can see it's very poor output. When I try to perform "lscpu" command from my code, changing only one line:

        String[] args = {"/system/bin/cat", "/proc/cpuinfo"};

to

        String[] args = {"lscpu"};

I am getting error:

W/System.err: java.io.IOException: Cannot run program "lscpu": error=13, Permission denied

However, I have application Termux on my phone. It's shell console and I don't know why but I can perform "lscpu" in this console (I cannot from app code). Check this out:

lscpuoutput

I would like to get that output into my app. Do you have any ideas how to get that nice human readable output about CPU info?

I'd appreciate any help!

score 0 · Accepted Answer · answered Mar 06 '20 at 16:24

OK. I was able to solve the problem for the most part. Focusing on /proc/cpuinfo only was not good idea. Instead, I managed to get interesting hardware info like that:

Get smartphone manufacturer and model. In my case the output is: "samsung SM-J730F":

    String manufacturer = Build.MANUFACTURER;
    String model = Build.MODEL;

This command shows number of CPU cores:

    Runtime.getRuntime().availableProcessors()

From this file you can get your CPU frequency. Remember to use .trim() because this file may contain whitespace character like it was in my case and I had problem to convert result to float for further operations:

   ("/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq").trim()

File containing number of online CPUs:

   /sys/devices/system/cpu/online

File containing number of offline CPUs. If all CPUs are online, this file seems to be empty but it may contain whitespace char:

  ("/sys/devices/system/cpu/offline").trim()

Command to get architecture:

System.getProperty("os.arch")

With all of this I created nice, human readable output. I guess this topic can be closed. Best Regards!

Getting human readable info about CPU

1 Answers1