Supporting perf.py on Mac OS

examples/perf.py

@@ -73,10 +73,19 @@ def cpu_get():
 #returns cpu_usage
 def cpu_check():
     if is_windows == False:
-        cpu1 = cpu_get()
-        time.sleep(1)
-        cpu2 = cpu_get()
-        cpu_percent = (float(cpu1[0] - cpu2[0])/float(cpu1[1] - cpu2[1]))*100
+        if is_mac == False:
+            cpu1 = cpu_get()
+            time.sleep(1)
+            cpu2 = cpu_get()
+            cpu_percent = (float(cpu1[0] - cpu2[0])/float(cpu1[1] - cpu2[1]))*100
+        else:
+            os.system("sysctl -n vm.loadavg > cpu_temp")
+            c = open("cpu_temp", 'r')
+            c_line = c.readline()
+            c.close
+            os.remove("cpu_temp")
+            R = c_line.split(' ')
+            cpu_percent = float(R[1]) * 3
     else:
 	os.system("wmic cpu get loadpercentage /value > cpu_temp")
 	c = open("cpu_temp", 'r')
@@ -143,6 +152,8 @@ parser.add_option('-p', '--path', dest='path',
 global is_windows
 is_windows = (platform.system() == 'Windows' or
               'CYGWIN_NT' in platform.system())
+global is_mac
+is_mac = (platform.system() == 'Darwin')
 
 # save corrent path
 pwd = os.getcwd()