From: "Martin J. Dürst" <duerst@...>
Date: 2013-07-17T10:17:31+09:00
Subject: [ruby-core:56056] Re: [CommonRuby - Feature #8640] Add Time#elapsed to return nanoseconds since creation

Hello Aaron,

On 2013/07/17 1:46, Aaron Patterson wrote:
> Hi Martin,
>
> On Tue, Jul 16, 2013 at 03:24:36PM +0900, duerst (Martin D��rst) wrote:
>>
>> Issue #8640 has been updated by duerst (Martin D��rst).
>>
>>
>> I think this is a good idea. But since
>> duration = Time.now - start
>> is in seconds, I'd either keep seconds as units, or make the use of nanoseconds explicit, e.g. like this:
>> duration = start.elapsed_nanoseconds
>
> I chose nanoseconds because it can be represented as an integer,

On a 32-bit machine, that works up to about 0.5 seconds. (On a 64-bit 
machine, it's about 73 years.) After that, it will be a Bignum.

Regards,   Martin.

> so we
> don't need to allocate Ruby objects (plus all the other benefits
> integers buy us).  So I'd really like to stick with nanoseconds as the
> unit.
>
> I'll propose both `elapsed` and `elapsed_nanoseconds` to matz.  :-)
>