Re: log_checkpoints, microseconds

On 04/10/2014 10:43 PM, Peter Geoghegan wrote:
> On Thu, Apr 10, 2014 at 12:20 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> I think you're both wrong.  1000 usec = 1 msec, not the other way round.
>
> Yes, but why would you ever want to divide any number of microseconds
> by 1000 like this, unless you were actually interested in nanoseconds?
> The point is that we start out with microseconds "elapsed" here, not
> milliseconds or seconds.

Take a break, then take another look.

The code first gets the number of microseconds elapsed. It wants to
print it out in milliseconds. The question is: "How many milliseconds is
X microseconds"? The answer is X / 1000.

For comparison, imagine that you know that 180 minutes has elapsed, and
you want to print that out in hours. To do that, you divide 180 by 60.

- Heikki