Re: st: get current time with milliseconds?

[iip <iip.umar.rifai@gmail.com>]

Hi Sergiy,

Thanks a lot, very informatif.

I'm going to test time performance of code repeat the code multiple
times, so based on your info, on Stata I'm only able to do it in
seconds right?

Best,

-iip-

On Tue, Jul 23, 2013 at 10:35 AM, Sergiy Radyakin
<serjradyakin@gmail.com> wrote:
> Hi Iip,
>
> First, you may want to elaborate on your particular problem you are
> solving. Be careful because as we know: " The OS Components may
> contain support for programs written in Java. Java technology is not
> fault tolerant and is not designed, manufactured, or intended for use
> or resale as on-line control equipment in hazardous environments
> requiring fail-safe performance, such as in the operation of nuclear
> facilities, aircraft navigation or communication systems, air traffic
> control, direct life support machines, or weapons systems, in which
> the failure of Java technology could lead directly to death, personal
> injury, or severe physical or environmental damage. " (
> http://technet.microsoft.com/en-us/library/cc976720.aspx )
>
> Second, read the following article:
> http://msdn.microsoft.com/en-us/magazine/cc163996.aspx
>
> Now given that Stata is cross-platform, and that "timestamps ... from
> Windows NT are limited to a maximum resolution of 10 or 15
> milliseconds, depending on the underlying hardware" you will have a
> decent problem to have such a precise measurement. And by that I mean
> "current time to milliseconds", I don't mean just any time close to
> current, with some milliseconds attached to it. Note that neither
> Windows XP, nor Windows Server 2003, nor earlier versions of Windows
> can't use HPET (if you count on it).
>
> In any case here is what you may want to explore, and more suggestions
> will probably come from others:
> 1) to time performance of code repeat the code multiple times, then
> you need to measure seconds;
> 2) to get the world time consult an online service, many are linked to
> atomic clocks worldwide; transmission delay is usually a fraction of a
> second (about 0.2 here) and it takes several seconds to synchronize;
> 3) to get really precise time measurement you may want to attach a GPS
> dongle and read time from there. that might give you up to a 40ns
> resolution, not sure how fast your program will be able to digest it;
> 4) to get random numbers use truernd or other similar approaches.
>
> Finally, Stata advertizes: "High-frequency data with millisecond
> resolution" here: http://www.stata.com/features/time-series/
> But I always assumed that the above refers to the ability to
> manipulate data stored with such precise timestamps, not to generate
> and timestamp it with such high frequency.
>
>
> Best, Sergiy Radyakin
>
> On Mon, Jul 22, 2013 at 9:10 PM, iip <iip.umar.rifai@gmail.com> wrote:
>> On Thu, Jul 18, 2013 at 12:29 PM, iip <iip.umar.rifai@gmail.com> wrote:
>>> Hi All,
>>>
>>> I'm trying to get current time with milliseconds, using
>>> c(current_time) only get seconds, how to get time including a
>>> milliseconds?
>>>
>>> Thanks,
>>>
>>> -iip-
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