Source Code for Module pyvision.analysis.Timer

 1  import time 
 2  import pyvision as pv 
 3   
 4 -class Timer: 
 5      ''' 
 6      A simple timer class used to measure and record run times.  Each timer has a 
 7      member variable named table which keeps a log of timing data. 
 8       
 9      Usage: 
10      timer = pv.Timer() 
11       
12      ... Do Some Stuff ... 
13       
14      timer.mark("Event 1") 
15       
16      ... Do Some Stuff ... 
17       
18      timer.mark("Event 2") 
19       
20      print timer 
21      -- or -- 
22      ilog(timer,"TimingData") 
23       
24      ''' 
25       
26 -    def __init__(self): 
27          ''' 
28          Create and setup the timer.  Also creates a mark titled "Timer Created". 
29          ''' 
30          self.table = pv.Table() 
31          self.started = False 
32          self.i = 0 
33          self.mark("Timer Created") 
34                   
35 -    def mark(self,event,notes=None): 
36          ''' 
37           
38          @param event: a short text description of the event being marked. 
39          @param notes: additional notes for this event. 
40          @returns: 6-tuple of times in seconds: Wall Clock Time, Time since last mark, Time since creation, CPU time, CPU time since last mark, CPU time since creation 
41          ''' 
42          current = time.time() 
43          cpu = time.clock() 
44          if self.started == False: 
45              self.started = True 
46              self.prev = self.start = current 
47              self.cpu_prev = self.cpu_start = cpu 
48          self.table[self.i,"event"] = event 
49          self.table[self.i,"time"] = current 
50          self.table[self.i,"current"] = current - self.prev 
51          self.table[self.i,"total"] = current - self.start 
52          self.table[self.i,"cpu_time"] = cpu 
53          self.table[self.i,"cpu_current"] = cpu - self.cpu_prev 
54          self.table[self.i,"cpu_total"] = cpu - self.cpu_start 
55          self.table[self.i,"notes"] = notes 
56           
57          rt = current 
58          ct = current - self.prev 
59          tot = current - self.start 
60          crt = cpu 
61          cct = cpu - self.cpu_prev 
62          ctot = cpu - self.cpu_start 
63           
64          self.prev = current 
65          self.cpu_prev = cpu 
66          self.i += 1 
67           
68          return rt,ct,tot,crt,cct,ctot 
69           
70 -    def __str__(self): 
71          '''Render the timing log to a string.''' 
72           
73          return self.table.__str__() 
74       
75 -    def save(self,filename): 
76          '''Save the timing log to a csv file.''' 
77          self.table.save(filename) 
78