讀取/proc/{pid}/stat

/**

* Get CPU stat of specified process.

* @param pid Process ID

* @return null may be returned if some unexpected things happens

*/

public static long[] getProcCpuStat(int pid) {

String file = String.format(Locale.US, "/proc/%d/stat", pid);

BufferedReader br = null;

try {

br = new BufferedReader(new FileReader(file));

String line = null;

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

String[] fields = line.split("\\s+");

if (fields.length >= 15) {

long[] stat = new long[]{Long.parseLong(fields[13])/**utime**/,

Long.parseLong(fields[14]) /**stime***/};

return stat;

}

}

} catch (IOException e) {

e.printStackTrace();

} finally {

IOUtils.closeQuietly(br);

}

return null;

}

實例

root@efb27a24edbb:/opt# cat /proc/464/stat

464 (pmwebd) S 1 1 1 34816 1 4210944 409 0 29 0 0 2 0 0 20 0 1 0 213582 100552704 1470 18446744073709551615 1 1 0 0 0 0 0 1 16390 0 0 0 17 5 0 0 2 0 0 0 0 0 0 0 0 0 0

doc

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