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Date: Sat, 14 Jan 2017 17:07:49 +0100
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Subject: RE: [PHP-DEV] Fwd: Monotonic Time
From: anatol.php@belski.net ("Anatol Belski")

Hi,

> -----Original Message-----
> From: Niklas Keller [mailto:me@kelunik.com]
> Sent: Friday, January 13, 2017 4:46 PM
> To: Leigh <leight@gmail.com>
> Cc: Anatol Belski <anatol.php@belski.net>; Michael Wallner =
<mike@php.net>;
> PHP Internals <internals@lists.php.net>; Bob Weinand <bwoebi@php.net>;
> Daniel Lowrey <rdlowrey@php.net>
> Subject: Re: [PHP-DEV] Fwd: Monotonic Time
>=20
> 2017-01-13 15:06 GMT+01:00 Leigh <leight@gmail.com>:
>=20
> > On Fri, 13 Jan 2017 at 09:35 Niklas Keller <me@kelunik.com> wrote:
> >
> > > Hi Anatol,
> > >
> > > Do you think we should merge hrtime into core or add a simple
> > > function
> > just
> > > like microtime() to ext/standard?
> > >
> > > Regards, Niklas
> > >
> >
> > It would be great if it could be a simple function, however it is
> > going to be difficult to produce something cross-platform and
> > meaningful with a single function. (I know Anatol has written =
portable
> > code, I haven't looked at it but I assume it's wrapping the various =
structs used
> by i.e.
> > performance counters, hrtime, etc.)
> >
> > I don't think we can get away from having an object-based
> > implementation to wrap those internal structs, but I do think this =
is
> > a useful addition regardless of how it's presented.
> >
>=20
> With timer.c it's very easy to have it as one function, in fact it's a =
simple static
> method currently doing exactly what I think it should probably do in =
core as a
> function.
>=20
> =
http://svn.php.net/viewvc/pecl/hrtime/trunk/hrtime.c?revision=3D341600&vi=
ew=3D
> markup
> < Line 416.
>=20
The PerformanceCounter class from the hrtime ext allows to implement any =
time measurement directly in PHP. It provides the most low level units =
used by the system, the ticks. To convert ticks into actual time, the =
tick frequency is required. The frequency can be actually hidden from =
the implementation, or could be exposed to PHP. Exposing might be useful =
for several reasons, fe if one would want to compare different systems. =
Anyway, these are the base bricks.

Niklas, about merging into core - not sure it needs the StopWatch class, =
but maybe. The performance counter class, at the very low level, could =
have more chance. Taking timer.c as base should be fine, too, even there =
is a significant improved potential down to the ASM level later, though =
very platform specific. In first place what would make sense to know - =
what exact usage would it be? More specific use case info is what is =
needed to discuss and figure out the required implementation.

Regards

Anatol