[ pycrypto-Bugs-627645 ] measureTickSize() can fail from low res

Bugs item #627645, was opened at 2002-10-23 15:01
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=120937&aid=627645&group_id=20937

Category: None
Group: None
>Status: Closed
>Resolution: Fixed
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
Assigned to: A.M. Kuchling (akuchling)
Summary: measureTickSize() can fail from low res

Initial Comment:
if the resolution is really low, this function failed to find a 
valid interval.  here's how i fixed it.


def _measureTickSize(self):
        # _measureTickSize() tries to estimate a rough 
average of the
        # resolution of time that you can see from 
Python.  It does
        # this by measuring the time 100 times, 
computing the delay
        # between measurements, and taking the median 
of the resulting
        # list.
        interval = [0] * 100
        
        # Compute 100 differences
        t=time.time()
        for i in range(0,100):
            t2=time.time()
            delta=int((t2-t)*1e6)
            t=t2          
	    if delta: interval[i] = delta
	

        # Take the median of the array of intervals
        avg = reduce(lambda x, y: x+y, interval)
        avg = ((avg+1)/len(interval))+1
        self._ticksize=avg

----------------------------------------------------------------------

>Comment By: A.M. Kuchling (akuchling)
Date: 2003-03-10 14:55

Message:
Logged In: YES 
user_id=11375

Believed fixed in 1.9alpha5.


----------------------------------------------------------------------

Comment By: Robert Olson (olson)
Date: 2002-11-06 11:29

Message:
Logged In: YES 
user_id=20112

I ran into this as well on Windows. My solution was to 
use time.clock() 
instead of time.time() on windows; 
time.clock() uses the windows hires 
clocks and works great for this. 

I've submitted patch 634515 for this.

----------------------------------------------------------------------

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