how to refactor nested for loop into smaller for loop assume each of them independent?

[BartC]

On 09/10/2016 18:33, Jussi Piitulainen wrote:
> Chris Angelico writes:
>
>> On Mon, Oct 10, 2016 at 12:26 AM, Dennis Lee Bieber wrote:
>>> {This response is delayed as I'm waiting for the program to complete so I
>>> can get the run time}
>>> {Well... it's been near 24 hours and still merrily scrolling sums on my
>>> console -- so I'm going to kill the running program}
>>
>> Eight BILLION of them. I wouldn't bother waiting for that.
>
> Eight billion is a big number. I know from experience that computers can
> compute a big number of computations in a short time. Therefore, I would
> expect the computer to compute eight billion computations in a short
> time. Maybe.

Compute, maybe. But the OP is printing something out at each step. 
Printing to a console is very, very slow, compared with even with 
running CPython.

On my machine, CPython might run through an empty loop at 10 to 20M 
iterations per second, but is some 4000 times slower if it has to print 
one "A" per line at each step.

The OP might try redirecting the output to a file (assuming he doesn't 
want to read every single line of output as it's produced). That will be 
much faster, although it depends on the workload in the run() function 
being executed.

Or only print every 1000th line or something if progress has to be 
monitored.

-- 
Bartc