On Mon, 2014-04-07 at 08:49 +0200, Anatol Belski wrote:
On Mon, April 7, 2014 00:57, Chung Leong wrote:
Doesn't the win32 implementation of gettimeofday() already use the
performance timer?
On Sun, Apr 6, 2014 at 3:52 PM, Anatol Belski anatol@belski.net
wrote:
Hi,
I would like to propose the extension implementing a high resolution
StopWatch class. It also makes possible to implement a custom stopwatch
using the almost low level ticks delivered by the underlaying APIs. The
extension does NOT implement high resolution timestamps synchronizable
to
an external source (well, maybe yet).
One reason for implementing it is the absense of the nanosecond time in
PHP. The extension is merely focused on user space timers.
Another reason is that Windows machines not using win8 are vulnerable
no some unaccurate time APIs. This windows implementation uses
performance counters to achieve some better timing results which can be
considered stable within short time frames. Coupled with the fact that
no synchronization to an external source is needed, that might be useful
for
windows users.
The extension would be released under the BSD license, the code is
available here http://belski.net/phpz/hrtime-0.4.3.tar.gz
The uses of this extension are execution time measurements of code
blocks
as well as any other StopWatch use cases. The future scope were for
example implememnting high resolution wait, however this needs some
more variables to do it portable and right.
Here's a user code example
$c = new HRTime\StopWatch;
$c-start();
/* do some interesting stuff*/
$c-stop();
$elapsed0 = $c-getLastElapsedTime(HRTime\Unit::NANOSECOND);
/* do something else */
$c-start();
/* do some interesting stuff again */
$c-stop();
$elapsed1 = $c-getLastElapsedTime(HRTime\Unit::NANOSECOND);
$elapsed_total = $c-getElapsedTime(HRTime\Unit::NANOSECOND);
Regards
Anatol
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No, it's causing instability on different hardware. Please check bug #64633.
If there are no objections, i'll be adding this extension in the next
days.
Regards
Anatol
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