Add dep for playground

client/deps/realtimecomm_playground/pgutil.py

+# Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+from autotest_lib.client.bin import test, utils
+
+def get_pids(program_name):
+    """
+    Collect a list of pids for all the instances of a program.
+
+    @param program_name the name of the program
+    @return list of pids
+    """
+    pidlist = utils.system_output("pgrep -f \'%s\'" % program_name)
+    return pidlist.splitlines()
+
+
+def get_number_of_logical_cpu():
+    """
+    From /proc/stat/.
+
+    @return number of logic cpu
+    """
+    ret = utils.system_output("cat /proc/stat | grep ^cpu[0-9+] | wc -l")
+    return int(ret)
+
+
+def get_utime_stime(pids):
+    """
+    Snapshot the sum of utime and the sum of stime for a list of processes.
+
+    @param pids a list of pid
+    @return [sum_of_utime, sum_of_stime]
+    """
+    timelist = [0, 0]
+    for p in pids:
+        statFile = file("/proc/%s/stat" % p, "r")
+        T = statFile.readline().split(" ")[13:15]
+        statFile.close()
+        for i in range(len(timelist)):
+            timelist[i] = timelist[i] + int(T[i])
+    return timelist
+
+
+def get_cpu_usage(duration, time):
+    """
+    Calculate cpu usage based on duration and time on cpu.
+
+    @param duration
+    @param time on cpu
+    @return cpu usage
+    """
+    return float(time) / float(duration * get_number_of_logical_cpu())
+